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John Bally 1
Henry Throop21,2Center for Astrophysics and Space Astronomy
1Department of Astrophysical and Planetary Sciences University of Colorado, Boulder
2Southwest Research Institute (SWRI), Boulder
ALMA Observations of ALMA Observations of Irradiated Irradiated Protoplanetary Protoplanetary
DisksDisks
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d253-535 in M43
YSOs near massive stars: UV photo-ablation of disksirradiated jets
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OutlineOutline• Most stars and planets form in clusters / OB associations: (Lada & Lada 03)
- UV: External (OB stars) + Self-irradiation=> Disk photo-ablation => mass loss: EUV, FUV
Review Orion’s proplyds=> Metal depletion in wind / enrichment of disk=> UV-triggered planetesimal formation= Jets => active accretion => disks
- Carina- The Bolocam 1.1 mm survey of the Galactic plane
• What will ALMA Contribute?: [5 to 50 mas resolution!]- Surveys of HII regions & clusters (Orion, Carina, …)- Best done as community-led Legacy surveys
=> Clusters of sources: disk radii, masses, I-front radii=> Resolve ionized flows, disks features, protoplanets
f-f, recombination lines, entrained hot dust=> Neutral flow composition, velocity, structure
CI, CO, dust, photo-chemistry products=> Disk B (Zeeman & dust), composition, structure, gaps
the organic forest
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ALMA &ALMA & irradiated disksirradiated disks10 µµµµJy sensitivity & 10 mas resolution
3 mm 1.3 mm 850 µµµµm 450 µµµµm 350 µµµµmBand 3 6 7 9 10
Resolution 0.04” 0.019” 0.013” 0.007” 0.005”(B = 14 km) AU AU AU AU AU
Sco-Cen 6 3 2 1 0.7(150 pc)
Orion 17 8 6 3 2(430 pc)
Carina 90 42 29 15 11(2,200)
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The Orion/Eridanus Bubble (Hαααα): d=180 to 500pc; l > 300 pcOrion OB1 Association: ~ 40 > 8 M stars: ~ 20 SN in 10 Myr
1a (8 - 12 Myr; d ~ 350 pc))
1b (3 -6 Myr; d ~ 420 pc)
1c (2 - 6 Myr; d ~ 420 pc)
Orion Nebula = 1d (<2 Myr; d ~ 460 pc)
λλλλ Ori (< 3 Myr)
Barnards's Loop Eridanus Loop
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850 µm 2.6 mm 13CO
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Trapezium
(L = 105 Lo t < 105 yr )
OMC 1Outflow (Η(Η(Η(Η2222) ) ) ) t = 500 yr)
(L = 105 Lo t << 105 yr)
ΒΒΒΒNKL
OMC1-S(L = 104 Lo ,t < 105 yr)
Hundreds of Proplyds
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0.5 – 2.2 µµµµm
104 AU
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11.7 µµµµm
104 AU
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HH529
HH514
θθθθ1C LV 5
OMC1-S
HH202 jet
HH202 source
HH202 source
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HH514
θθθθ1C LV 5
HH529
OMC1-S
11.7 µµµµm TReCS
HH202 jet
HH202 source
HH202 source
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OMC-1S: Zapata et al. (2005)�
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OMC-1S: Zapata et al. (2005)�
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HST4
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Proplyd photo-ablation flows: dM/dt ~ 10-7 Mo yr -1
HST4 (LV 6), LV 1 Keck NIRSPEC + AO(Shuping et al. 2006)
Pos
ition
(m
as)
Br γ HeI
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Disk Photo-ablationIonizing EUV: λλλλ < 912 A (E > 13.6 eV) :
H => H+
T ~ 10,000 K cII ~ 10 km/s
Soft FUV: 912 A < λλλλ < ~2,000 A ( ~6 eV < E < 13.6 eV)heating by dust photo-electrons, 2H => H2
T ~ 100 to 5,000 K cI ~ 1 – 5 km/s
Escape at r > fGM / c2 ~ 5 AU for cII (for Solar mass)~ 40 AUfor cI
Self-irradiation vs. External irradiation:
L self(UV) / 4 ππππ d*2 = Lexternal(UV) / 4 ππππ dOB
2
External irradiation: L external(UV) ~ 1049 photons / secSelf - irradiation: Lself(UV) ~ 1040 - 1043 photons / sec
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Anatomy of a proplyd
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6 – 13.6 eV UV photons
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6 – 13.6 eV UV photons
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6 – 13.6 eV UV photons
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6 – 13.6 eV UV photons
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6 – 13.6 eV UV photons> 13.6 eV photons
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6 – 13.6 eV UV photons> 13.6 eV photons
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6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
rGI = GM/cI2 ~ 40 AU
cI ~ 3 km/s
~ 105 - 106 years
t ~ f Mdisk N21-1 r disk
-1 CI-1 (years)
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
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6 – 13.6 eV UV photons> 13.6 eV photons6 – 13.6 eV UV photons> 13.6 eV photons
Stellar wind
rGII = GM/cII2 ~ 5 AU
cII ~ 10 km/s
t ~ 9 x 106 Q49 -1/2 cII 10
-1 d1pc-1 Mo r 10AU
-3/2 years
< 2 - 5 x 106 years
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(Williams et al. 2005) Mdisk ~ 0.003 to0.02 Mo
HH 514
HST 2
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HH 514 micro-jet in Orion: Hαααα, [HII] (HST/STIS)
Jet
Counter Jet
HST 2
Nebular Hα
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Orion Nebula: > 50 disks seen in silhouette
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HST 16
HST 10
HST 17
Irradiatedproto-planetary disks:
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182-413 (HST10)
Hα λ6563α λ6563α λ6563α λ6563
[OI] λ 6300
To T
rape
zium
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Keck AO IR HST Hα
(Kassis et al. 2007, in preparation)
2.12 µm H2 0.6563 µm Hα=> Soft UV photo-heating of disk surface
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Evidence for Sedimentation:Proplyd winds are dust depleted
• Near-UV penetration:- UV penetration depth, N(H) ~ 2 to 4 x 1021 (cm-2)
=> gas /dust > 3 x ISM- RV ~ 5 => grains are larger than ISM
=> grey • Chandra X-ray attenuation at 0.3 – 1 KeV
- Ionization front (flux & radius) => ne = n(H), dM/dt ∼∼∼∼ f n(H) cII
- Wind model => N(H)- Chandra => N(metals)- N(H) / N(metals) > 3 – 5 x ISM
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The Beehive proplyd; HH 240 irradiated jet
Bally et al. 2005
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HH 240
North
HH 240
South
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� 8 ; 10 20 cm
kT ~ 0.57 keV & 3.55 keVNH ~ 8 x 1020 cm-2 (soft)NH ~ 6 x 1022 cm-2 (hard)
(Kastner et al. 2005, ApJS, 160, 511)
d181-825 “Beehive” proplyd Chandra COUP
Jet Star
1280 AU
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d181-825 “Beehive” proplyd X-ray absorption:NH ~ 8 x1020 cm-2
But, foreground AV ~ 1 mag !
H-alpha:
ne(rI) = 2.6 x 104 cm-3
dM/dt = 2.8 x 10-7 Mo yr-1
Neutral Column:(from 50 AU, V = 3 km/s)
NH(RI) = 2.2 x 1021 V3-1 r50
-1
⇒Photo-ablation flow metal depleted!
(Kastner et al. 2005, ApJS, 160, 511)
1280 AU
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Evidence for growing grains: Orion 114-426 (Throop et al. 2001)
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Growing grains: Si 10 µµµµm feature(Shuping et al. 2006)
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UVUV--Induced Induced Planetesimal Planetesimal formation:formation:• Problem: How do grains grow from
d < 100 cm (gravity un-important)to
d ~ 1 - 100 km (gravity dominated)c.f. Weidenschilling, S. J., & Cuzzi, J. N. 1993, PP3
- Grains not “sticky”- Collisions tend to fragment & bounce- Head-wind => radial drift of solids
=> fast growth• Grain growth + sedimentation + UV-photoablation ⇒ Mass-loss from disk is metal depleted⇒ Retained disk becomes metal-enriched
Gravitational instability => planetesimalsYoudin, A. N., & Shu, F. H. 2002, ApJ, 580, 494Throop, H. B. & Bally, J, 2005, ApJ, 623, L149
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UV => Fast Growth of UV => Fast Growth of PlanetesimalsPlanetesimals::
Grain growth => Solids settle to mid-planeUV => Remove dust depleted gas
=> High metallicity in mid-planeGravity => Instability
=> 1 - 100 km planetesimals
- Fast Formation of 1 to 100 km planetesimals
Throop & Bally et al. 05
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NASA / NAI
R. Durisen
What will ALMA see?
Magnetospheric gaps?
Spiral structure?
Composition gradients?
Heavy organics?
Ice lines?
Accreting protoplanets ?
Planetary gaps?
Magnetic fields?
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What will ALMA see?
Growing grains &Proto-planetary gravel?
Photo-dissociation products? (e.g. CI & molecular ions)
Shock in neutrals & inPlasma ?
Jets & disk winds ?
f-f, recombination lines ?
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Possible ALMA Projects:Possible ALMA Projects:Solicit Legacy programs:
Large, comprehensive surveysData to go public immediately
Surveys of Orion, Carina, M8, M16, M17, W40, ππππ Sco…Disk radii, radial velocity, velocity dispersion, etc.continuum & line fluxes as functions of location,environment, age
Radial gradients: dust, gas, ττττ, compositionSurface density: ΣΣΣΣ(r) ~ r -αααα What is αααα ?Composition:
The organic forest => chemical evolutionIces => gas transitions (H2O, NH3, CH3OH, …)
Velocity fields => dynamical YSO massesStructure: Gaps, spirals, accretion-heated protoplanets
Externally ionized protoplanets & disk features(late-phase proplyds)
Photo-ablation flows: structure, velocity => mass lossMagnetic fields: polarized dust, Zeeman in CN, SO, …
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ηηηη Carinae Nebula:Trumpler 14 region
Pillars with jets
Tr 14 cluster(< 3 Myr)
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Trumpler 14
Dark globule:faces ηηηη Car
Jet ?
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Twin jets fromYSOs inPillars near Tr 14
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Bipolar jet
YSO
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The Bolocam 1.1 mm survey (as of Sept 2006)• ~ 90 square degrees of the Galactic Plane• 5,000 dense cloud cores (> 20 mJy / beam)• Best tracer of massive star-forming cores
Single 45 min scan of 3 x 1 deg field in Plane (100 mJy / beam)
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ConclusionsConclusions• Most Stars from in dense clusters, near massive stars
Most planetary systems likely form in OB associations• ALMA Resolution to 0.005” (band 10 @ B = 14 km)
Ionized photo-ablation flows, wind, & jetsf-f, recombination lines, dust
Vradial, n, grain emissivity, mass-loss ratesNeutral flow (proplyd body)
Dust, CI, CO, HCO+Vradial, shocks, flow geometry
Disks & Planets: Velocity field, Structure, CompositionDust, molecular lines, Zeeman in CN
Velocity field and Structure: radii, spirals, gaps)Grain properties, polarization, ices, ions vs. neutralsGiant protoplanets?
• Emphasize Legacy Surveys rather than GO programs
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The End
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