Celestial Mechanics

In 2006 I developed theory on orbital resonance capture[82] covering the non-adiabatic regime, extending Goldreich and Borderie’s work that was restricted to adiabatic drift only. My work makes it possible to determine what orbital drift rates for dust particles, planets or moons allow capture into resonance (orbital commensurability). The insight can be reduced to a dimensional analysis argument and so can be simply stated and calculated making it easy to predict where and when pairs of bodies can capture into orbital resonance. This work has been widely applied to interpret recently discovered multiple exo-planet systems, orbital dust dynamics, drift in satellite systems and early solar system planetary migration.

In 2011 I proposed a theory[33] to explain numerically measured scaling relations for stability times in closely packed planetary systems. The argument is based on three-body resonance overlap for chaotic behavior. This remains the first and only attempted theoretical explanation for numerically measured scaling laws for closely packed planetary or satellite systems. I and Rob French corrected and extended the theory[14] to cover more types of three-body resonances with a detailed study of the inner Uranian satellite system in 2014, and there I have tried to better understand the chaotic evolution and stability of resonant chains or consecutive pairs of bodies in first order resonances. In 2011 few multiple extrasolar planetary systems were known and to test estimates for three-body resonance strengths I used the inner Uranian satellite system. But following the Kepler mission discoveries of numerous multiple planet systems, including some in resonant chains, there has been increased interest in the stability of multiple planet systems. I would like to better understand the diffusive-like behavior of these chaotic systems by studying drifting Hamiltonian models. While we succeeded in estimating a boundary for stability, we should be able to improve our ability to predict lifetimes by better understanding the diffusive-like behavior.

I have a body of work[56,61,62,63,66,67,69,72,78,81,87,88,89,99] relating properties of dusty circumstellar disks to underlying and unseen planetary architecture. This work includes proposing (with Math Holman in 2000) a new mechanism[113] for creating star grazing comets via planet migration (recently of interest because of the discovery of Taby’s star showing dips in the light curve perhaps from evaporating comets). We also related the structure of dusty and gaseous disk edges to the masses of planets residing just interior to or within them and made predictions for unseen planets in three systems[72,89,99], including in 2006 the prediction of a planet in the Fomalhaut system, just interior to its dusty disk edge, and where an orbiting object was later found in 2008.

The associated computational efforts motivated us (with graduate student Alex Moore) to develop the first GPU (graphics processing unit) accelerated symplectic integrator (QYMSYM)[36] capable of resolving collisions between planetesimals and planets and integrating all force pairs in a celestial mechanics setting. Using our code (and running on home-built gaming computers that housed gift graphics cards from NVidia), we wrote a series of papers [17,22,23,24,29] relating multiple planet architecture to evolution of

combined planet and planetesimal systems, including placing constraints on how much orbital debris could have crossed the orbits of multiple planet HR8799 and KOI730 systems.

The Kepler 36 system, with two closely spaced planets (near the 7:6 resonance) with extremely different densities (one lighter than water, the other heavier than iron), presented a puzzle as fine tuning is required to account for the orbital spacing via resonance capture. I wrote in 2013 on “Origin Scenarios” for this system[22], finding that collisions between planets and embryos can not only account for the orbital spacing (presenting an alternative to stochastic migration) but also the dramatically different densities. Grazing encounters are more statistically likely than a direct encounter and they are probably more likely to strip the atmosphere of a planet. Our collision scenario provides an alternative to the atmospheric evaporation model accounting for the different densities of the two planets in the Kepler 36 system.

I have been pretty well funded in theoretical and numerical celestial mechanics and exoplanet research having received as principle investigator 2 National Science Foundation grants and 2 NASA astrophysics grants, each giving 3 years of support, primarily to support a single graduate student at a time.

Title: Detection of Outer ExtraSolar Planets and Characterization of Disk Properties from Circumstellar Gas and Dust Morphology, Award Period: 06/01/04-05/31/08, Source of Support: NASA, Award Amount: $265,000

Title: Collaborative Proposal: Holding Footpoints to the Fire: Planet Disk Theory Confronts Observations, Award Period: 08/15/04—07/31/08 Source of Support: NSF, Award Amount: $464,945, Additional REU Supplement: + $26,125

Title: The dynamics of disk clearing, late stage planetesimal disk and planetary system evolution Award Period: 09/01/2009-08/31/2012 Source of Support: NSF, Award Amount: $289,134

Title: Stability and Evolution of Multiple Planet and Satellite Systems Award Period: 6/01/13-5/31/16, Source of Support: NASA, Award Amount: $322,460

Tides and Mass Spring models:

Grazing encounters are more likely than direct collisions. Likewise tidal encounters, where two bodies pass near each other but don’t actually touch, are more likely than grazing collisions. Numerous planetary features (such as impact craters) have been explained by interplanetary collisions but we were the first to propose that tensile stress associated with strong tidal encounters could cause large chasmata on icy moons (and perhaps even Valles Marineris on Mars) and offering an alternative to geologically slow tectonic-like explanations. After a couple of years of effort and by leveraging techniques used in graphics simulations (mass spring models and hinge models for flexible surface simulation) I succeeded in developing a code that was accurate and

stable enough to illustrate crustal surface fracture during a tidal encounter. This culminated in a paper early 2016 in Icarus[3] proposing strong tidal encounters as a new geophysical tectonic-like process.

Mass spring models had not been used in astrophysics before, probably because most known asteroids are well approximated by rubble piles rather than solid elastic bodies. We were pushed into them by requiring sufficient accuracy to measure small strains. My mass spring model code allowed the first direct simulation of tidal spin down and tidal lock, where we simulated the viscoelastic behavior of a tidally deformed body. With Julien Frouard of the Naval Obsevatory in 2016 we compared the analytical predicted and simulated spin down and associated orbital drift rates[4], finding a match to 30%

and with a form consistent with his predictions. We both now believe that the discrepancy arises because of the neglect of bulk viscosity in the computation (so there is probably no fault in the simulation), as the prediction assumes an incompressible material and our straight-forward mass spring model is compressible.

While analytical computations are mostly restricted to homogenous or round bodies. The simulations are more flexible. Summer 2016 we measured how drift rate depends on axis ratios for ellipsoids[c], see above figure, and then developed scaling arguments to explain the scaling relations as analytical computations were lacking. We also simulated a body similar to minor planet Haumea, finding that if Haumea has 20% of its mass in ice on its ends, the tidal drift rate would be 10 times faster than that of the equivalent volume rocky sphere. The result emphasizes how much freedom we have in exploring tidal phenomena with the simulations compared to that in the analytical regime and that we have already using this code to explore past what has been calculated analytically. We envision many future applications, such as studying librating bodies, spin-orbit resonance capture and chaotic evolution, trying to understand the spin orientation of Pluto’s satellites, the tidal tilt of near-earth asteroids during close passages in the Earth/moon system, simulating internal oceans, understanding surface features caused by polar wander, predicting the heat distribution of non-round bodies such as the Moon and exploring coupled thermal and tidal evolution models.

Infrared Extragalactic work:

My graduate thesis focused on ground based observations in sub millimeter and near-infrared wavelengths of the nearest radio galaxy Centaurus A[133,135]. With a dark and curved dust-lane across its center, the elliptical galaxy hosts a warped star forming

disk that is dark at visible wavelengths, but emitting in the mid-infrared and sub-millimeter. My warped disk model was predictive later on. Shown below on the left is a multi-color mid-infrared image of Centaurus A from Spitzer images and on the right the model with warp seen in emission, modified from that used to match the sub millimeter kinematics and the ground based near-infrared imaging (with warp seen in absorption) developed in my thesis. Centaurus A was one of the first targets observed by the Spitzer Space Telescope and the earliest science demonstrations of its success also presented my model[70]. I have also applied warped disk models in the circumstellar setting to explain spiral like features seen in reflected light in Hubble Space Telescope images[79], proposed a new mechanism for generating a warp from feedback, the “wind driven warp instability” [103](an alternative to the radiative warp instability) and applied a warped disk model to the radio galaxy M84 but on a much smaller scale[116] (the central few hundred parsecs rather than a kilo parsec). The dynamics of a galactic warp is a set of circular rings that precess slowly in a background potential. Deviations from this in M84 suggested in 2000, prior to the Chandra era, (and later on in the nucleus of Cen A, [40]) that feedback from ambient hot gas could push and reorient dusty disks[116]. In Centaurus A if you look closely near the center on the left, there is a faint elliptical feature, a shell, that is not present in the model on the right (discovered here!)[80]. Subsequent Spitzer spectroscopic observations demonstrated that the shell has different spectral characteristics than the star forming disks[75], so it could be a counterpart to expanding hot bubbles that have been seen in active galaxies and recently discovered in our Galaxy (the Fermi bubble). It would be interesting to reexamine models for dusty disks in galaxy centers in a more modern context of active galaxy feedback.

Constraints on Dark matter and infrared imaging of spiral galaxies:

At Ohio State, in 1994, I joined a near-infrared survey of nearby galaxies, using one of the early large format near-infrared arrays and writing a series of papers on the structure of nearby galaxies as seen in the near-infrared [112,121,123,125,126,127,128,130,131]. I carried out a substantial fraction of the survey observations and data reduction. I developed an efficient convolution technique for estimating the mid plane gravitational potential using an image[122], and used that to estimate the torque on gas inflowing along a galactic bar[130] (fueling a nuclear starburst). I also discovered a peanut shaped bulge in barred galaxy[125] where both peanut and bar could be seen simultaneously in the near-infrared. Using the gravitational potential models produced directly from the images I wrote a series of papers looking at stellar orbits integrated in that potential[122], and placing constraints on the dark matter distribution in galaxies[120,121,124,126]. I used non-axisymmetric structures such as galactic bars and spiral arms to measure the mass to light ratio and then estimated the dark matter fraction by subtracting out the baryonic disk component. The series of papers supported a relationship between surface brightness and dark matter concentration http://arxiv.org/abs/astro-ph/9811024v1 where bright galaxies contain little central dark matter. The paucity of dark matter in the centers of high surface brightness galaxies continues to present challenges for models of galaxy formation.

Observations of Active Galaxies:

Using high angular resolution near-infrared imaging by the Hubble Space Telescope, I wrote a series of papers studying ionization cones and emission line morphology in active galaxies[76,114,115,116]. We discovered that most Seyfert galaxies host unresolved nuclear point sources, detectable in the near-infrared, demonstrated through their variability and with correlations with other activity indicators that these unresolved sources were associated with accretion onto a black hole[93,104,105,106,109,110]. Subsequent spectral energy distributions (with Almudena Alonso-Herrero) showed that spectral energy distributions were inconsistent with a sharped edged torus model (there are too many intermediate Seyferts) and so requires a dusty torus that is clumpy[95]. I also carried out a survey of elliptical galaxy cores[108], and placed constraints on extinction in galaxy centers using Pa-alpha emission, finding that most H-alpha radiation escapes, even in starburst galaxies[104].

I was relatively well funded in observational astronomy via observing proposals to the Hubble Space and Spitzer Telescopes. The following are those for which I was principle investigator and received funding.

Title: IRS mapping of the 500pc nuclear dust shell in Centaurus A Award Period Covered: 08/10/06 –08/31/09 Source of Support: JPL/Spitzer Science Center, Total Award Amount: $86,305

HST Cycle 7 proposal 7868: Near-IR Cores of Radio Galaxies, Are the AGN's Moving in the Galaxy? HST Cycle 7 proposal 7869: The Morphology of Dense Gas in Seyferts, Obscuration and Fueling of AGNs HST Cycle 7 proposal 7886: NICMOS Snap Shot Survey of Early-Type Galaxies HST Cycle 15 proposal 10972: The structure of HD100546's self-shadowed circumstellar disk Cycle 7 proposals received funding in 1998 and Cycle 15 in 2006.

Galaxy Dynamics:

In 2011, we ran 3 extra million massless particle tracers in a N-body galactic simulation (accelerated on the GPU and modeled after the Milky Way) so that we could resolve (and search for) structure in local velocity distributions (phase space)[34]. This paper made a series of predictions that we could in the next few years test with GAIA observations (GAIA is a European satellite that is scheduled to release data of almost a billion stars in the next few years). We predicted structure (gaps in the local velocity distributions) present at all radii in the Galaxy and that they are associated with changes in spiral pattern speed rather than resonances. We predicted a three-arm structure near the Solar neighborhood and coupled to lopsided motion at larger radii. We predicted localized bursts of star formation (and with age gradients moving across the Galaxy) caused by peaks from interference between spiral patterns (and building on our previous study of M51[92]). Previous work had not carried out such a detailed study using an N-body simulation possibly because many particles are needed to resolve structure in both spatial and velocity dimensions.

Following a visit from Borja Anguino in 2015, and the discovery of mono-abundance groups of stars in the solar neighborhood I attempted to invert the group velocity distributions and estimate the distribution of similar stars (birth siblings) in regions outside the solar neighborhood[11]. I found that the parent populations were larger than expected and brought to our attention some of the challenges we will face trying to learn about the formation and evolution of the Milky Way when we have larger data sets of stars containing both kinematic and abundance measurements. This field is exciting as ongoing surveys (such as the GAIA mission and GALAH) are increasing the number of Milky Way stars with such measurements by 2 to 4 orders of magnitude. The onslaught of data also presents challenges to develop numerical techniques that can can be used to extract information from these large data sets, improve the Galactic models and test the underlying dynamical mechanisms.

In 2015 I (with visiting undergraduate student Alex de la Vega) investigated epicyclic phase wrapping[7] associated with external perturbations as a possible explanation for the vertical gradients recently detected in the outer Galaxy. This work offers a simpler and alternative explanation (compared to breathing and bending modes) for these recently detected gradients and builds on our previous work searching for disk structures in the outer galaxy using stellar number counts[100], our proposal that stirring

in the outer galaxy is more likely induced by perturbations from dwarf galaxy encounters rather than migration associated with spiral density waves[46], and our proposal that there could remain kinematic evidence of these past structures in the velocity field[48] (with Ivan Minchev).

With (then) graduate student Ivan Minchev, we explored how spiral and bar structure would affect measurements of Oorts constants[65,68], finding the spiral structure is a dominant source of noise and that the bar is needed to explain trends with age and color. We found that resonances associated with spiral structure could cause gaps in the solar neighborhood velocity distribution and heat the disk[77,86]. I found that spiral perturbations could cause chaotic behavior near a bar’s resonance (leading to a paper entitled “chaos in the solar neighborhood”[97]). I proposed a vertical resonance capture model to account for peanut shaped bulges[101], in 2014 revising to become a better resonant heating model[20], following the discovery of such a bulge in our Galaxy and using N-body simulations to test the model. The resonance, because it is quite narrow, places a tight constraint on mass models in the inner Galaxy and perhaps it can be used to learn about the past evolution of the mass distribution in the same region.

Light Curves and the Dimming Sky:

Transient sky surveys or optical monitoring programs that measure light curves of many stars focus on finding objects that brighten (novae, gamma ray bursts) and do not systematically search for stars that dim (with the exception of searches for planetary transits). Stars that host eclipsing circumsecondary disks have only been found through serendipity. Dippers in the Kepler K2 mission archive and Taby’s star (all stars that dimmed) were found via a citizen science program — “the planet hunters” (actual people looking by eye and flagging weird regions in the millions of light curves). To address the problem I wrote in 2011 the section in the J1407 discovery paper (with Eric Mamajek) estimating the likelihood that a survey would find a circumsecondary or circumplanetary disk in occultation and showing that the probability is not necessarily low[32]. I carried out the first systematic survey (of 40000 stars and using the 2MASS calibration database) blindly looking for stars that dim[15]. With visitor Zeyang Meng we developed an automated way of identifying eclipses from disks that were present in eclipsing binary catalogs[16]. With student Eva Bodman, we developed a comet evaporation model for Taby’s star[5] (publishing the first scientific paper on interpretation of dips in its light curve and following Jason Wright’s alien megastructure proposal). We recently proposed a magnetospheric truncation unification model for the K2 dippers, offering an explanation for why so many low mass stars exhibit this phenomena[b] (truncation radius must be below dust sublimation temperature and the magnetosphere lifts dust letting us see it passing in front of the star). We have also proposed a new mechanism for infrared light curve variability involving heating the edge of a circumbinary disk[8]. I continue to promote searches (in photometric surveys) for objects that dim, with the goal of making it possible for novel dimming objects to be followed up right away spectroscopically, rather than only being identified after they happened (via serendipity) and when it’s too late to observe them during the occultation. Occultations could be exciting and powerful as they would allow measurements on milli-

AU structures of disk material (ring structures, gaps in disks) and measurements of composition (through spectroscopic studies as material passes in front of and absorbs light from the star). I would like to propose for exploratory pilot time-sensitive observing of some known systems (now that there are a few more systems known) to see if spectroscopic follow up will be interesting (the lack of institutional telescope access makes this more difficult but not impossible). The logistics is challenging but important to do now as synoptic surveys will become increasingly exciting and important in the next decade.

Turbulence, Locomotion:

Summer 2016, motived by the problems associated with tidal oscillations of fluid/solid boundaries I created a robotic swimmer from a vibrational motor. It swims at low Reynolds number in glycerin, has no external moving parts and only costs $1.20 so provides a low-cost way of making robust and small robotic swimmers. This is in collaboration with the mechanical engineers Doug Kelley and Hesam Askari and biophysicist Patrick Oakes, paper submitted[a] (the movie: https://youtu.be/0nP2MgzaOyU ).

In 2005, motivated by Spitzer imaging of young clusters we tested the idea that jets and winds from young stellar objects are responsible for turbulence in the molecular cloud associated with star formation region NGC 1333. Lacking any direct association between young stars and motions in the molecular cloud, but finding many slow moving and large cavities in the molecular cloud, we proposed that cavities, or remnants of past outflow activity, are an important and necessary intermediary between young stellar outflows and molecular cloud turbulence[85]. This led to a series of papers in collaboration with Adam Frank and his students on simulations of stellar outflows and how they disturb molecular clouds.

Scientific publications by Alice C. Quillen

Marks: u =undergrad, *=graduate student

Papers submitted for publication in refereed journals:

a. A coin vibrational motor swimming at low Reynolds number, Quillen, A. C., Askari, H., Kelley, D. H., Friedmann, T., Oakes, P. W., 2016, submitted to Regular and Chaotic Dynamics, http://arxiv.org/abs/1608.08202 see the movie at https://youtu.be/0nP2MgzaOyU

b. Dippers and Dusty Disk Edges: A Unified Model, Bodman*, E. H. L., Quillen, A. C., Ansdell*, M., Hippke, M., Boyajian, T. S., Mamajek, E. E, Blackman, E. G., Rizzuto, A. Kastner, J. H., 2016, Monthly Notices of the Royal Astronomical Society, submitted, http://arxiv.org/abs/1605.03985

Publications in press:

c. Tidal spin down rates of homogeneous triaxial viscoelastic bodies, Quillen, A. C. Kueter-Youngu, A., Frouard, J., & Ragozzine, D. 2016, Monthly Notices of the Royal Astronomical Society, accepted for publication, http://arxiv.org/abs/1607.08591 Published in refereed journals:

1. Excitation of Coupled Stellar Motions in the Galactic Disk by Orbiting Satellites, D’Onghia, E., Madau, P., Vera-Ciro, C., Quillen, A., & Hernquist, L. 2015, The Astrophysical Journal, 823, 4-12.

2. Identification of Globular Cluster Stars in RAVE data II: Extended tidal debris around NGC 3201, Anguiano, B., De Silva, G. M., Freeman, K., Da Costa, G. S., Zwitter, T., Quillen, A. C., Zucker, D. B., Navarro, J. F., Kunder, A., Siebert, A., Wyse, R. F. G., Grebel, E. K., Kordopatis, G., Gibson, B. K., Seabroke, G., Sharma, S., Wojno, J., Bland-Hawthorn, J., Parker, Q. A., Steinmetz, M., Boeche, C., Gilmore, G., Bienayme, O., Reid, W., Watson, F. 2016, Monthly Notices of the Royal Astronomical Society, 457, 2078-2085.

3. Crustal Failure in Icy Moons and Satellites from a Strong Tidal Encounter, Quillen, A. C., Giannellau, D., Shaw, J., Ebinger, C. 2016, Icarus, 275, 267-280. See the movie at https://youtu.be/W5GyTEyXTss and http://arxiv.org/abs/1512.02154

4. Damped Mass-Spring Model Simulations of Tidal Spin-Down in a Kelvin-Voigt Viscoelastic Sphere, Frouard, J., Quillen, A. C., Efroimsky, M., Giannellau, D., 2016, Monthly Notices of the Royal Astronomical Society, 458, 2890-2901. http://arxiv.org/abs/1601.08222

5. KIC 8462852: Transit of a Large Comet Family, Bodman*, E. H. L., & Quillen, A. Astrophysical Journal Letters, 819, L34-L38,

6. Identification of Globular Cluster Stars in RAVE data II: Extended tidal debris around NGC 3201, Anguiano, B., De Silva, G. M., Freeman, K., Da Costa, G. S., Zwitter, T., Quillen, A. C., Zucker, D. B., Navarro, J., Kunder, A. Siebert, A., Wyse, R. F. G., Grebel, E. K., Kordopatis, G., Gibson, B. K., Seabroke, G., Sharma, S., Bland-Hawthorn, J., Parker, Q., Steinmetz, M., accepted for publication in Monthly Notices of the Royal Astronomical Society, 2016, 457, 2078-2085.

7. Phase Wrapping of Epicyclic Perturbations in the Wobbly Galaxy, de la Vegau, A., Quillen, A. C., Carlin, J. L., Chakrabarti, S., & D’Onghia, E. 2015, Monthly Notices of the Royal Astronomical Society, 454, 933-945. http://arxiv.org/abs/1507.07489

8. Infrared Variability from Circumbinary Disc Temperature Modulations, Bodman*, E. H. L., & Quillen, A. C. 2015, Monthly Notices of the Royal Astronomical Society, 453, 2387-2398.

9. Torque on an exoplanet from an anisotropic evaporative wind, Teyssandier*, J., Owen, J. E., Adams, F. C., & Quillen, A. C. 2015, Monthly Notices of the Royal Astronomical Society, 452, 1743-1753.

10. Far Ultraviolet Morphology of Star Forming Filaments in Cool Core Brightest Cluster Galaxies, Tremblay, G. R., O’Dea, C. P., Baum, S. A., Mittal, R., McDonald, M. A., Combes, F. Li, Y., McNamara, B. R., Bremer, M. N. , Clarke, T. E., Donahue, M. Edge. A.C. Fabian A.C., Hamer, S. L., Hogan, M. T., Oonk, J. B. R., Quillen, A. C., Sanders, J. S., Salome, P., Voit, M. 2015, Monthly Notices of the Royal Astronomical Society, 451, 3768-3800

11. The parent populations of 6 abundance groups identified from Chemical Tagging in the Solar neighborhood, Quillen, A. C., Anguiano, B., De Silva, G., Freeman, K., Zucker, D. B., Minchev, I., & Bland-Hawthorn, J. 2015, Monthly Notices of the Royal Astronomical Society, 450, 2354-2366. http://arxiv.org/abs/1503.02887

12. Clustered Cepheid Variables 90 kiloparsec from the Galactic Center, Chakrabarti, S., Saito, R., Quillen, A., Gran, F., Klein, C., & Blitz, L. 2015, Astrophysical Journal Letters, 802, L4-L9.

13. Modeling Transiting Circumstellar Disks: Characterizing the Newly Discovered Eclipsing Disk System OGLE LMC-ECL-11893, Scott*, E. L., Mamajek, E. E., Pecaut*, M. J., Quillen, A. C., Moolekamp*, F., & Bell, C. P. M. 2014, Astrophysical Journal, 797, 6-12.

14. Resonant Chains and Three-body Resonances in the Closely-Packed Inner Uranian Satellite System, Quillen, A. C. & French, R. S. 2014, Monthly Notices of the Royal Astronomical Society, 445, 3959-3986. http://arxiv.org/abs/1408.1141

15. Variability in the 2MASS Calibration Fields: A Search for Transient Obscuration Events, Quillen, A. C., Ciocca, M., Carlin, J., Meng*, Z., & Bell, C. P. M. 2014, Monthly Notices of the Royal Astronomical Society, 441, 2691-2716. http://arxiv.org/abs/1402.1198

16. Searching for eclipsing binaries that host discs, Meng*, Z., Quillen, A. C., Bell, C. P. M. Mamajek, E. E., & Scott*, E. L. 2014, Monthly Notices of the Royal Astronomical Society, 441, 3733-3741.

17. Stability Boundaries for Resonant Migrating Planet Pairs, Bodman*, E. H. L., & Quillen, A. C. 2014, Monthly Notices of the Royal Astronomical Society, 440, 1753-1762

18. A New Stellar Chemo-Kinematic Relation Reveals the Merger History of the Milky Way Disk, Minchev, I., Chiappini, C., Martig, M., Steinmetz, M., de Jong, R. S., Boeche, C., Scannapieco, C., Zwitter, T., Wyse, R. F. G., Binney, J. J., Bland-Hawthorn, J., Bienayme, O., Famaey, B., Freeman, K. C., Gibson, B. K., Grebel, E. K., Gilmore, G., Helmi, A., Kordopatis, G., Lee, Y. S., Munari, U., Navarro, J. F., Parker, Q. A., Quillen, A. C., Reid, W. A., Siebert, A., Siviero, A., Seabroke, G., Watson, F., & Williams, M. 2014, Astrophysical Journal Letters, 781, L20-26

19. Dynamical Structures in the Galactic Disk, Quillen, A. C. 2014. Invited Review, Setting the scene for Gaia and LAMOST, Proceedings of the International Astronomical Union

Symposium 298, S. Feltzing, G. Zhao, N. A. Walton & P. A. Whitelock,. Eds, Vol. 9, 105-116

20. A Vertical Resonance Heating Model for X- or Peanut-Shaped Galactic Bulges, Quillen, A. C., Minchev, I., Sharma, S., Qin, Y. & Di Matteo, P. 2014, Monthly Notices of the Royal Astronomical Society, 437, 1284-1307. http://arxiv.org/abs/1307.8441

21. Magnetic Arms Generated by Multiple Interfering Galactic Spiral Patterns, Chamandy*, L., Subramanian, K., & Quillen, A. 2014, Monthly Notices of the Royal Astronomical Society, 437, 562-574.

22. Origin Scenarios for the Kepler 36 planetary system, Quillen, A. C., Bodman*, E., & Moore*, A. 2013, Monthly Notices of the Royal Astronomical Society, 435, 2256-2267. http://arxiv.org/abs/1304.6124

23. Limits on Orbit-crossing Planetesimals in the Resonant Multiple Planet System, KOI-730, Moore*, A. & Hasanu, I. & Quillen, A. C. 2013, Monthly Notices of the Royal Astronomical Society, 432, 1196-1202.

24. Effects of a Planetesimal Disk on Stability Scenarios for the Planetary system HR8799, Moore*, A. & Quillen, A. C., 2013, Monthly Notices of the Royal Astronomical Society, 430, 320-329

25. Evolution of Galactic Disks: Multiple Patterns, Radial Migration and Disk Outskirts, Minchev, I., Famaey, B., Quillen, A. C., Di Matteo, P., Combes, F., Vlajic, M., Erwin, P., & Bland-Hawthorn, J. 2012, Astronomy & Astrophysics, 548, 126

26. Radial Migration Does Little for Galactic Disc Thickening, Minchev, I., Famaey, B., Quillen, A. C., Dehnen, W., Martig, M., & Siebert, A 2012, Astronomy & Astrophysics, 548,

27. Residual cooling and persistent star formation amid active galactic nucleus feedback in Abell 2597, Tremblay, G. R., O'Dea, C. P., Baum, S. A., Clarke, T. E., Sarazin, C. L., Bregman, J. N., Combes, F., Donahue, M., Edge, A. C., Fabian, A. C., Ferland, G. J., McNamara, B. R., Mittal, R., Oonk, J. B. R., Quillen, A. C., Russell, H. R., Sanders, J. S., Salomé, P., Voit, G. M., Wilman, R. J., & Wise, M. W. 2012, Monthly Notices of the Royal Astronomical Society, 424, 1042

28. Multiphase signatures of active galactic nucleus feedback in Abell 2597, Tremblay, G. R., O'Dea, C. P., Baum, S. A., Clarke, T. E., Sarazin, C. L., Bregman, J. N., Combes, F., Donahue, M., Edge, A. C., Fabian, A. C., Ferland, G. J., McNamara, B. R., Mittal, R., Oonk, J. B. R., Quillen, A. C., Russell, H. R., Sanders, J. S., Salomé, P., Voit, G. M., Wilman, R. J., & Wise, M. W. 2012, Monthly Notices of the Royal Astronomical Society, 424, 1026

29. Capture of Irregular Satellites via Binary Planetesimal Exchange Reactions in Migrating Planetary Systems, Quillen, A. C., Hasanu, I. & Moore*, A. 2012, Monthly Notices of the Royal Astronomical Society, 425, 2507-2518.

30. Multiphase Signatures of AGN Feedback in Abell 2597, Tremblay, G. R., O'Dea, C. P., Baum, S. A., Clarke, T. E., Sarazin, C. L., Bregman, J. N.; Combes, F., Donahue, M., Edge, A. C., Fabian, A. C., Ferland, G. J., McNamara, B. R., Mittal, R., Oonk, J. B. R., Quillen, A. C., Russell, H. R., Sanders, J. S., Salomé, P., Voit, G. M., Wilman, R. J., & Wise, M. W. 2012, Monthly Notices of the Royal Astronomical Society, 424, 1026

31. Residual Cooling and Persistent Star Formation amid AGN Feedback in Abell 2597, Tremblay, G. R., O'Dea, C. P., Baum, S. A., Clarke, T. E., Sarazin, C. L., Bregman, J. N.; Combes, F., Donahue, M., Edge, A. C., Fabian, A. C., Ferland, G. J., McNamara, B. R., Mittal, R., Oonk, J. B. R., Quillen, A. C., Russell, H. R., Sanders, J. S., Salomé, P., Voit, G. M., Wilman, R. J., & Wise, M. W. 2012, Monthly Notices of the Royal Astronomical Society, 424, 1042

32. Planetary Construction Zones in Occultation: Eclipses by Circumsecondary and Circumplanetary Disks and a Candidate Eclipse of a Pre-Main Sequence Star in Sco-Cen, Mamajek, E. E., Quillen, A. C., Pecaut, M., Moolekamp, F., Scott*, E. L., Kenworthy, M., Cameron, A. C., & Parley, N., 2012, Astronomical Journal, 143, 72-87.

33. Three Body Resonance Overlap in Closely Spaced Multiple Planet Systems, Quillen, A. C. 2011, Monthly Notices of the Royal Astronomical Society, 418, 1043-1054. http://arxiv.org/abs/1106.0156

34. Structure in phase space associated with spiral and bar density waves in an N-body Hybrid galactic disk, Quillen, A. C., Doughertyu, J., Bagleyu, M., Minchev, I., & Comparetta*, J. Monthly Notices of the Royal Astronomical Society, 2011, 417, 762-784. http://arxiv.org/abs/1010.5745

35. Book Review: Alessandra Celletti: Stability and Chaos in Celestial Mechanics. Springer-Praxis books in Astronomy and Planetary Sciences, Springer, 2009, 261 pp, ISBN 3540851453, 9783540851455, Quillen, A. C., 2011, Celestial Mechanics and Dynamical Astronomy, 110, 4, 399-400.

36. QYMSYM: A GPU-Accelerated Hybrid Symplectic Integrator That Permits Close Encounters, Moore*, A., & Quillen, A. C. 2011, New Astronomy, 16, 445-455.

37. Jeans Instability in a Tidally Disrupted Halo Satellite Galaxy, Comparetta*, J., & Quillen, A. C. 2011, Monthly Notices of the Royal Astronomical Society, 414, 810

38. The 1.6 micron near infrared nuclei of 3C radio galaxies: Jets, thermal emission or scattered light? Baldi, R. D., Chiaberge, M., Capetti, A., Sparks, W., Macchetto, F. D., O'Dea, C. P., Axon, D. J., Baum, S. A., & Quillen, A. C. 2010, Astrophysical Journal, 725, 2426

39. Non-equilibrium Dynamical Processes in the Galaxy, Quillen, A C., & Minchev, I. 2010, Highlights of Astronomy, Volume 15, p. 178-179

40. The warped Disk of Centaurus A from a radius of 2 pc to 6500 pc, Quillen, A. C., Neumayer, N., Oosterloo, T., & Espada, D. 2010, Publications of the Astronomical Society of Australia, 27, 396

41. Low frequency hybrid earthquakes near a magma chamber in Afar: Quantifying path effects, Coteu, D., Belachew*, M. , Quillen, A. C., Ebinger, C. J., Keir, D., Ayele, A., Wright, T. 2010, Bulletin of the Seismological Society of America, 100, 1892-1903

42. Hubble Space Telescope Far-ultraviolet Observations of Brightest Cluster Galaxies: The Role of Star Formation in Cooling Flows and BCG Evolution, O'Deau, K. P., Quillen, A. C., O'Dea, C. P., Tremblay*, G. R., Snios, Bradford T., Baum, Stefi A.; Christiansen, K., Noel-Storr, J., Edge, A. C., Donahue, M., Voit, G. M. 2010, Astrophysical Journal, 719, 1619

43. Herschel photometry of brightest cluster galaxies in cooling flow clusters, Edge, A. C., Oonk, J. B. R., Mittal, R., Allen, S. W., Baum, S. A., Boehringer, H., Bregman, J. N., Bremer, M. N., Combes, F., Crawford, C. S., Donahue, M., Egami, E., Fabian, A. C., Ferland, G. J., Hamer, S. L., Hatch, N. A., Jaffe, W., Johnstone, R. M., McNamara, B. R., O'Dea, C. P., Popesso, P., Quillen, A. C., Salome, P., Sarazin, C. L., Voit, G. M., Wilman, R. J., Wise, M. W. 2010, Astronomy and Astrophysics, 518, 47

44. Herschel observations of FIR emission lines in brightest cluster galaxies, Edge, A. C., Oonk, J. B. R., Mittal, R., Allen, S. W., Baum, S. A., Boehringer, H., Bregman, J. N., Bremer, M. N., Combes, F., Crawford, C. S., Donahue, M., Egami, E., Fabian, A. C., Ferland, G. J., Hamer, S. L., Hatch, N. A., Jaffe, W., Johnstone, R. M., McNamara, B. R., O'Dea, C. P., Popesso, P., Quillen, A. C., Salome, P., Sarazin, C. L., Voit, G. M., Wilman, R. J., Wise, M. W. 2010, Astronomy and Astrophysics, 518, 46

45. Invited review chapter in the book, Formation and Evolution of Exoplanets, edited by Rory Barnes, Wiley-VCH Verlag BmbH & Co. KGaA, Weinheim, 2010, Pinpointing Planets in Circumstellar Disks, Quillen, A. C. p. 27-48

46. Radial mixing in the outer Milky Way disk caused by an orbiting satellite, Quillen, A. C., Minchev, I., Bland-Hawthorn, J., Haywood, M. 2009, Monthly Notices of the Royal Astronomical Society, 397, 1599

47. HST/ACS Emission Line Imaging of Low-redshift 3CR Radio Galaxies. I. The Data, Tremblay*, G. R., Chiaberge, M., Sparks, W. B., Baum, S. A., Allen, M. G., Axon, D. J., Capetti, A., Floyd, D. J. E., Macchetto, F. D., Miley, G. K., Noel-Storr, J., O'Dea, C. P., Perlman, E. S., & Quillen, A. C. 2009, Astrophysical Journal Supplements, 183, 278

48. Is the Milky Way ringing? The hunt for high velocity streams, Minchev, I., Quillen, A. C., Williams, M., Freeman, K. C., Nordhaus, J., Siebert, A., Bienayme, O. 2009, Monthly Notices of the Royal Astronomical Society Letters, 396, L56

49. Outflow Driven Turbulence in Molecular Clouds, Carroll*, J. C., Frank, A., Blackman, E., Cunningham*, A., & Quillen, A. C. 2009, Astrophysical Journal, 695, 1376

50. The morphology of Collisionless Galactic Rings Exterior to Evolving Bars: Test Particle Simulations, Bagleyu, M., Minchev, I, & Quillen, A. C. 2009, Monthly Notices of the Royal Astronomical Society, 395, 537

51. Protostellar Outflow Evolution in Turbulent Environments, Cunningham*, A. J., Frank, A., Carroll*, J., Blackman, E. G., & Quillen, A. C. 2009, Astrophysical Journal, 692, 816

52. Resonances in Galactic and Circumstellar Disks, Quillen, A. C. 2009, Astrophysics and Space Science Proceedings, “Chaos in Astronomy”, Athens, Greece, Sept 2007, ed. G. Contopoulos, P. A. Patsis, based on invited review talk, Springer-Verlag, Berlin-Heidelberg, p 191.

53. The Radial Velocity Experiment (RAVE): Second Data Release, Zwitter, T., Siebert, A., Munari, U., Freeman, K. C., Siviero, A., Watson, F. G., Fulbright, J. P., Wyse, R. F. G., Campbell, R., Seabroke, G. M., Williams, M., Steinmetz, M., Bienaymé, O, Gilmore, G., Grebel, E. K., Helmi, A., Navarro, J. F., Anguiano, B., Boeche, C., Burton, D., Cass, P., Dawe, J., Fiegert, K., Hartley, M., Russell, K., Veltz, L., Bailin, J., Binney, J., Bland-Hawthorn, J., Brown, A., Dehnen, W., Evans, N. W., Re Fiorentin, P., Fiorucci, M., Gerhard, O., Gibson, B., Kelz, A., Kujken, K., Matijevic, G., Minchev, I., Parker, Q. A., Peñarrubia, J., Quillen, A., Read, M. A., Reid, W., Roeser, S., Ruchti, G., Scholz, R.-D., Smith, M. C., Sordo, R., Tolstoi, E., Tomasella, L., Vidrih, S., Wylie-de Boer, E. 2008, AJ, 136, 421-451

54. An Infrared Survey of Brightest Cluster Galaxies. II: Why are Some Brightest Cluster Galaxies Forming Stars? O’Dea, C., Baum, S. A., Privon, G., Noel-Storr, J., Quillen, A.C., Zufelt, N., Park, J., Edge, A., Russell, H., Fabian, A. C., Donahue, M., Sarazin, C. L., McNamara, B., Bregman, J. N., Egami, E. 2008, Astrophysical Journal, 681, 1035-1045

55. HST NIR Snapshot Survey of 3CR Radio Source Counterparts II: An Atlas and Inventory of the Host Galaxies, Mergers and Companions, Floyd, D. J. E., Axon, D., Baum, S., Capetti, A., Chiaberge, M., Macchetto, D., Madrid, J., Miley, G., O'Dea, C. P., Perlman, E., Quillen, A., Sparks, W., Tremblay, G. 2008, Astrophysics Journal Supplements, 177, 148-173

56. The Vertical Structure of Planet-induced Gaps in Proto-Planetary Discs, Edgar, R. G., & Quillen, A. C. 2008, Monthly Notices of the Royal Astronomical Society, 387, 387-396

57. When is star formation episodic? A delay differential equation negative feedback model, Quillen, A. C., Bland-Hawthorn, J. 2008, Monthly Notices of the Royal Astronomical Society, 386, 2227-2234

58. Constraining Spiral Structure Parameters through Galactic Pencil-Beam and Large Scale Radial Velocity Surveys, Minchev*, I. & Quillen, A. C. 2008, Monthly Notices of the Royal Astronomical Society, 386, 1579-1587

59. An Infrared Survey of Brightest Cluster Galaxies. Paper I, Quillen, A.C., Zufeltu, N., Park*, J., O’Dea, C. P., Baum, S. A., Privon, G., Noel-Storr, J., Edge, A., Russell, H., Fabian, A., Donahue, M., Bregman, J. & McNamara, B., 2008, Astrophysical Journal Supplements, 176, 39-58

60. Spitzer Space Telescope Infrared Spectrograph mapping of the central kpc of Centaurus A, Quillen, A. C., Bland-Hawthorne, J., Green, J., Smith, J.D., Prasad, D., A., Alonso-

Herrero, A., Brookes, M. H., Cleary, K. &., Lawrence, C. 2008, Monthly Notices of the Royal Astronomical Society, 384, 1469

61. The Total Number of Planets in Debris Disk systems with Central Clearings, Faberu, P. & Quillen, A. C. 2007, Monthly Notices of the Royal Astronomical Society, 382, 1823

62. The Minimum Gap-opening Planet mass in an Irradiated Circumstellar Accretion Disk, Edgar, R., Quillen, A. C., & Park*, J. 2007, Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, 381, 1280

63. Planetary Embryos and Planetesimals Residing in Thin Debris Disks, Quillen, A. C., Morbidelli, A., & Mooreu, A. 2007, Monthly Notices of the Royal Astronomical Society, 380, 1642

64. Isophotal Structure and Dust Distribution in Radio-Loud Elliptical Galaxies, Tremblayu, G. R., Chiaberge, M., Donzelli, C. J., Quillen, A. C., Capetti, A. Sparks, W. B., & Macchetto, F. D. 2007, Astrophysical Journal, 666, 109

65. New Constraints on the Galactic Bar, Minchev*, I., Nordhaus*, J., & Quillen, A. C. 2007, Astrophysical Journal Letters, 664, L31

66. The formation of an eccentric gap in a gas disk by a planet in an eccentric orbit, Hosseinboru, A. P., Edgar, R., Quillen, A. C., & LaPageu, A. 2007, Monthly Notices of the Royal Astronomical Society, 378, 966

67. Diffusive low optical depth particle disks truncated by planets, Quillen, A. C.2007, Monthly Notices of the Royal Astronomical Society, 377, 1287

68. The Effect of Spiral Structure on the Measurements of the Oort Constants, Minchev*, I., & Quillen, A. C., 2007, Monthly Notices of the Royal Astronomical Society, 377, 1163

69. Chaotic zone boundary for low free eccentricity particles near an eccentric planet , Quillen, A. C., & Faberu, P. 2006, Monthly Notices of the Royal Astronomical Society, 373, 1245

70. Outflow driven cavities: Numerical Simulations of Intermediaries of Protostellar Turbulence, Cunningham*, A., Frank., A., Quillen, A. C., & Blackman, E. 2006, Astrophysical Journal, ApJ, 653, 416

71. The Radial Velocity Experiment (RAVE): first data release, Steinmetz, M., Zwitter, T., Siebert, A., Watson, F. G., Freeman, K. C., Munari, U., Campbell, R., Williams, M., Seabroke, G. M., Wyse, R. F. G., Parker, Q. A., Bienayme, O., Roeser, S., Gibson, B. K., Gilmore, G., Grebel, E. K., Helmi, A., Navarro, J. F., Burton, D., Cass, C. J. P., Dawe, J. A., Fiegert, K., Hartley, M., Russell, K. S., Saunders, W., Enke, H., Bailin, J., Binney, J., Bland-Hawthorn, J., Boeche, C., Dehnen, W., Eisenstein, D. J., Evans, N. W., Fiorucci, M., Fulbright, J. P., Gerhard, O., Jauregi, U., Kelz, A., Mijovic, L., Minchev, I., Parmentier, G., Penarrubia, J., Quillen, A. C., Read, M. A., Ruchti, G., Scholz, R. -D., Siviero, A., Smith, M. C., Sordo, R., Veltz, L., Vidrih, S., von Berlepsch, R., Boyle, B. J., Schilbach, E. 2006, Astronomical Journal, , 132, 1645

72. Predictions for a planet just inside Fomalhaut’s Eccentric Ring, Quillen, A. C. 2006, Monthly Notices of the Royal Astronomical Society, Pink Pages, 372, L14-L18.

73. An optical-IR jet in 3C133, Floyd, D. J. E., Laing, R., Chiaberge, M., Perlman, E., Sparks, W., Macchetto, D., Madrid, J., Axon, D., O'Dea, C. P., Baum, S., Quillen, A., Miley, G., & Capetti, A. 2006, Astrophysical Journal, 643, 660

74. Hubble Space Telescope Near-Infrared Snapshot Survey of 3CR radio source counterparts at low redshift, Madrid, J. P., Chiaberge, M., Floyd, D., Sparks, W. B., Macchetto, D., Miley, G. K., Axon, D., Capetti, A., O'Dea, C. P., Baum, S., Perlman, E., & Quillen, A. 2006, Astrophysical Journal Supplements, 2006, ApJS, 164, 307

75. Spitzer observations of the dusty warped disk of Centaurus A, Quillen, A. C., Brookes, M. H., Keene, J., Stern, D., Lawrence, C. R., & Werner, M. W. 2006, Astrophyscal Journal, 645, 1092

76. The warped nuclear disk of 3C449, Tremblayu, G., Quillen, A. C., Floyd, D. J.E., Noel-Storr, J., Baum, S. A., Axon, D., O’Dea, C. P., Chiaberge, M., Macchetto, D., Sparks, W. B, Miley, G. K., Capetti, A., Madrid, J. P., & Perlman, E. 2006, Astrophysical Journal, 643, 101

77. Heating by more than one spiral density wave, Minchev*, I., & Quillen, A. C., 2006, Monthly Notices of the Royal Astronomical Society, 368, 623

78. Planets Rapidly Create Holes in Young Circumstellar Disks, Varniere, P., Blackman, E. G., Frank, A., & Quillen, A.C. 2005, Astrophysical Journal, 640, 1110

79. The warped circumstellar disk of HD100546, Quillen, A. C. 2006, Astrophysical Journal, 640, 1078-1085.

80. Discovery of a 500pc shell in the nucleus of Centaurus A, Quillen, A. C., Bland-Hawthorn, J., Brookes, M. H., Werner, M. W., Smith, J. D., Stern, D., Keene, J., & Lawrence C.R. 2006, Astrophysical Journal Letters, 641, L29-L32

81. Observational Properties of Proto-planetary Disk Gaps, Varniere, P., Bjorkman, J. E., Quillen, A. C., Frank, A., Carciofi, A. C., Whitney, B. A., & Wood, K. 2006, Astrophysical Journal Letters, 637, L125

82. Reducing the Probability of Capture into Resonance, Quillen, A. C. 2006, Monthly Notices of the Royal Astronomical Society, 365, 1367-1382.

83. Multiwavelength Monitoring of the Dwarf Seyfert 1 Galaxy NGC4395. I. Reverberation based measurement of the Black Hole Mass The Least Luminous Seyfert 1 Galaxy, Peterson, B. M., Bentz, M.C., Desroches, L.-B., Fillippenko, A.V., Ho, L. C., Kaspi, S., Laor, A., Maoz, D., Moran, E.C., Pogge, R.W., & Quillen, A.C. 2005, Astrophysical Journal, 632, 799.

84. The Decay of Interplanetary Coronal Mass Ejections and Forbush Decrease Recovery Times, Pennau, R. F., & Quillen, A. C. 2005, Journal of Geophysical Research, Volume 110, Issue A9, CiteID A09S05.

85. Turbulence driven by outflow blown cavities in the molecular cloud of NGC 1333, Quillen, A.C., Thorndike*, S. L., Cunningham*, A., Frank, A., Gutermuth*, R., Blackman, E., Pipher, J., & Ridge, N. 2005, Astrophysical Journal, 632, 941-955.

86. The Effect of Spiral Structure on the Stellar Velocity Distribution in the Solar Neighborhood, Quillen, A.C., & Minchev*, I. 2005, Astronomical Journal, 130, 576.

87. Driving spiral arms in the circumstellar disks of HD 100546 and HD 141569A, Quillen, A. C., Varniere, P., Minchev*, I., & Frank, A. 2005, Astronomical Journal, 129, 2481.

88. The Evolution of Protoplanetary Disk Edges, Varniere, P., Quillen, A. C., & Frank, A. 2004, Astrophysical Journal, 612, 1152.

89. On the Planet and the Disk of CoKuTau/4, Quillen, A. C., Blackman, E.G., Frank, A., & Varniere, P. 2004, Astrophysical Journal Letters, 612, L137-L140.

90. Diffuse X-Ray Emission in Spiral Galaxies, Tyleru, K., Quillen, A. C., LaPageu, A., & Rieke, G. H. 2004, Astrophysical Journal, 610, 213.

91. Infrared Observations of Galaxies in the Local Universe. II. 391 Calibrated Images with Photometric and Structural Measurements, Grauer, A. D., Rieke, M. J., & Quillen, A. C. 2003, Astrophysical Journal Supplements, 149, 327.

92. Star Formation and Asymmetry in the Spiral Arms of M51: Variable Star Formation Caused by More than One Spiral Density Wave, Henryu, A. L., Quillen, A. C., & Gutermuth, R. 2003, Astronomical Journal, 126, 281.

93. 870 Micron Observations of Nearby 3CRR Radio Galaxies, Quillen, A. C., Almogu, J., & Yukitau, M. 2003, Astronomical Journal, 126, 2677.

94. Sagittarius A* Companion S0-2: A Probe of Very High Mass Star Formation, Gould, A., & Quillen, A. C. 2003, Astrophysical Journal, 592, 935.

95. Spectral Energy Distributions of Seyfert Nuclei, Alonso-Herrero, A., Quillen, A. C., Rieke, G. H., Ivanov, V. D., & Efstathiou, A. 2003, Astronomical Journal, 126, 81.

96. On the Formation of an Eccentric Disk via Disruption of a Bulge Core near a Massive Black Hole, Quillen, A. C., & Hubbard*, A. 2003, Astronomical Journal, 125, 2998.

97. Chaos Caused by Resonance Overlap in the Solar Neighborhood: Spiral Structure at the Bar's Outer Lindblad Resonance, Quillen, A. C. 2003, Astronomical Journal, 125, 785-793.

98. Near-Infrared and Optical Morphology of Spiral Galaxies, Eskridge, P. B., Frogel, J. A., Pogge, R. W., Quillen, A. C., Berlind*, A. A., Davies, R. L., DePoy, D. L., Gilbert, K. M., Houdashelt*, M. L., Kuchinski*, L. E., Ramírez*, S. V., Sellgren, K., Stutz, A., Terndrup, D. M., & Tiede*, G. P. 2002, Astrophysical Journal Supplements, 143, 73.

99. Structure in the Epsilon-Eridani Dusty Disk Caused by Mean Motion Resonances with a 0.3 Eccentricity Planet at Periastron, Quillen, A. C., & Thorndikeu, S. 2002, Astrophysical Journal Letters, 578, L149.

100.Prospecting for Spiral Structure in the Flocculent Outer Milky Way Disk with Color-Magnitude Star Counts from the Two Micron All Sky Survey, Quillen, A. C. 2002, Astronomical Journal, 124, 924.

101.Growth of a Peanut-shaped Bulge via Resonant Trapping of Stellar Orbits in the Vertical Inner Lindblad Resonances, Quillen, A. C. 2002, Astronomical Journal, 124, 722.

102.Using a Hipparcos-derived Hertzsprung-Russell Diagram to Limit the Metallicity Scatter of Stars in the Hyades: Are Stars Polluted? Quillen, A. C. 2002, Astronomical Journal, 124, 400-403.

103.A Wind-driven Warping Instability in Accretion Disks, Quillen, A. C. 2001, Astrophysical Journal, 563, 313–318.

104.A Comparison between PAα and Hα Emission: The Relation between Mean H II Region Reddening, Local Gas Density, and Metallicity, Quillen, A. C., & Yukitau, M. 2001, Astronomical Journal, 121, 2095.

105.The Nonstellar Infrared Continuum of Seyfert Galaxies, Alonso-Herrero, A., Quillen, A. C., Simpson, C., Efstathiou, A., & Ward, M. J. 2001, Astronomical Journal, 121, 1369.

106.The Multitude of Unresolved Continuum Sources at 1.6 Microns in Hubble Space Telescope Images of Seyfert Galaxies, Quillen, A. C., McDonaldu, C., Alonso-Herrero, A., Leeu, A., Shakedu, S., Rieke, M. J., & Rieke, G. H. 2001, Astrophysical Journal, 547, 129.

107.NGC 1614: A Laboratory for Starburst Evolution, Alonso-Herrero, A., Engelbracht, C. W., Rieke, M. J., Rieke, G. H., & Quillen, A. C. 2001, Astrophysical Journal, 546, 952.

108.A NICMOS Survey of Early-Type Galaxy Centers: The Relation Between Core Properties, Gas and Dust Content, and Environment, Quillen, A. C., Bower, G. A., & Stritzingeru, M. 2000, Astrophysical Journal Supplements, 128, 85-98.

109.The Ionization Source in the Nucleus of M84, Bower, G. A., Green, R. F., Quillen, A. C., Danks, A., Gull, T., Hutchings, J., Joseph, C., Kaiser, M. E., Weistrop, D., Woodgate, B., Malumuth, E. M., & Nelson, C. 2000, Astrophysical Journal, 534, 189.

110.The Variability of Seyfert 1.8 and 1.9 Galaxies at 1.6 Microns, Quillen, A. C., Shakedu, S., Alonso-Herrero, A., McDonaldu, C., Leeu, A., Rieke, M. J., & Rieke, G. H. 2000, Astrophysical Journal Letters, 532, L17-L20.

111.Discovery of a Nuclear Gas Bar Feeding the Active Nucleus in Circinus, Maiolino, R., Alonso-Herrero, A., Anders, S., Quillen, A., Rieke, M. J., Rieke, G. H., & Tacconi-Garman, L. E. 2000, Astrophysical Journal, 531, 219.

112.The Frequency of Barred Spiral Galaxies in the Near-Infrared, Eskridge, P. B., Frogel, J. A., Pogge, R. W., Quillen, A. C., Davies, R. L., DePoy, D. L., Houdashelt*, M. L., Kuchinski*, L. E., Ramírez*, S. V., Sellgren, K., Terndrup, D. M., & Tiede*, G. P. 2000, Astronomical Journal, 119, 536.

113.Production of Star-grazing and Star-impacting Planetesimals via Orbital Migration of Extrasolar Planets, Quillen, A. C., & Holman, M. 2000, Astronomical Journal, 119, 397-402.

114.NICMOS Imaging of Molecular Hydrogen Emission in Seyfert Galaxies, Quillen, A. C., Alonso-Herrero, A., Rieke, M. J., Rieke, G. H., Ruiz, M., & Kulkarni, V. 1999, Astrophysical Journal, 527, 696-708

115.Dust Lanes Causing Structure in the Extended Narrow-Line Region of Early-Type Seyfert Galaxies, Quillen, A. C., Alonso-Herrero, A., Rieke, M. J., McDonaldu, C., Falcke, H., & Rieke, G. H. 1999, Astrophysical Journal, 525, 685-690

116.M84: A Warp Caused by Jet-induced Pressure Gradients? Quillen, A. C., & Bower, G. A. 1999, Astrophysical Journal, 522, 718.

117.Kinematics and Neutral Hydrogen Properties of the Giant Low Surface Brightness Galaxy UGC 2936, Pickering*, T. E., van Gorkom, J. H., Impey, C. D., & Quillen, A. C. 1999, Astronomical Journal, 118, 765.

118.Mid-Infrared Emission from E+A Galaxies in the Coma Cluster, Quillen, A. C., Rieke, G. H., Rieke, M. J., Caldwell, N., & Engelbracht, C. W. 1999, Astrophysical Journal, 518, 632.

119.Do Proto-jovian Planets Drive Outflows? Quillen, A. C., & Trilling*, D. E. 1998, Astrophysical Journal, 508, 707.

120.Galaxies with Spiral Structure up to Z ~ 0.87: Limits on M/L and the Stellar Velocity Dispersion, Quillen, A. C., & Sarajedini*, V. L. 1998, Astronomical Journal, 115, 1412.

121.The Distribution of Dark Matter in a Ringed Galaxy, Quillen, A. C., & Frogel, J. A. 1997, Astrophysical Journal, 487, 603.

122.Orbits in the Bar of NGC 4314, Patsis, P. A., Athanassoula, E., & Quillen, A. C. 1997, Astrophysical Journal, 483, 731.

123.The Extinction Law in an Occulting Galaxy, Berlind*, A. A., Quillen, A. C., Pogge, R. W., & Sellgren, K. 1997, Astronomical Journal, 114, 107.

124.Spiral Structure Based Limits on the Disk Mass of the Low Surface Brightness Galaxies UGC 6614 and F568-6, Quillen, A. C., & Pickering*, T. E. 1997, Astronomical Journal, 113, 2075.

125.Discovery of a Boxy Peanut-shaped Bulge in the Near-Infrared, Quillen, A. C., Kuchinski*, L. E., Frogel, J. A., & Depoy, D. L. 1997, Astrophysical Journal, 481, 179.

126.Detection of Dynamical Structures Using Color Gradients in Galaxies, Quillen, A. C., Ramirez*, S. V., & Frogel, J. A.1996, Astrophysical Journal, 470, 790.

127.The Dwarf Galaxy NGC 1705-A Highly Composite Stellar Population, Quillen, A. C., Ramirez*, S, V., & Frogel, J. A. 1995, Astronomical Journal, 110, 205.

128.Multiband Images of the Barred Galaxy NGC 1097, Quillen, A. C., Frogel, J. A., Kuchinski*, L. E., Terndrup, D. M. 1995, Astronomical Journal, 110, 156.

129. Phase Transitions in the ISM - A Source of Dissipative Behaviour, Quillen, A. C., & Quillen, C. B. 1995, Astrophysics and Space Science, 233, 189.

130.An estimate of the gas inflow rate along the bar in NGC 7479, Quillen, A. C., Frogel, J. A., Kenney, J. D. P., Pogge, R. W., & Depoy, D. L. 1995, Astrophysical Journal, 441, 549.

131.The gravitational potential of the bar in NGC 4314, Quillen, A. C., Frogel, J. A., & Gonzalez*, R. A. 1994, Astrophysical Journal, 437, 162

132.High-resolution continuum and BR-gamma imaging observations of M82, Larkin*, J. E., Graham, J. R., Matthews, K., Soifer, B. T., Beckwith, S., Herbst, T. M., & Quillen*, A. C. 1994, Astrophysical Journal, 420, 159.

133.The warped disk of Centaurus A in the near-infrared, Quillen*, A. C., Graham, J. R., & Frogel, J. A. 1993, Astrophysical Journal, 412, 550.

134.Gravitational lensing effects in a time-variable cosmological 'constant' cosmology, Ratra, B., & Quillen*, A. 1992, Monthly Notices of the Royal Astronomical Society, 259, 738.

135.The kinematics of the molecular gas in Centaurus A, Quillen*, A. C., de Zeeuw, P. T., Phinney, E. S., & Phillips, T. G. 1992, Astrophysical Journal, 391, 121.

136.Comments on the observability of coronal variations, Golub, L., Hartquist, T. W., & Quillenu, A. C. 1989, Solar Physics, 122, 245.