Download - Oscillation spectra with regular patterns
Oscillation spectra with
regular patterns
Bill Chaplin, School of Physics & Astronomy University of Birmingham
IAU Symposium 301, 2013 August 20
Ah! signatures of terrestrial seismology
Pulsations in the HR diagramAerts, Christensen-Dalsgaard & Kurtz (2009)
asteroseismic solar-type &
red-giant targets
CoRoT ground-based
telescopes
asteroseismic solar-type &
red-giant targets
Kepler
CoRoT
De Ridder et al. 2009, Nature 459, 398
Non-radial oscillations in red giants
Asteroseismic KOI ensembleHigh-quality solar-like oscillations spectra of
Kepler Objects of Interest
Courtesy T. Roca Cortés
Helioseismology: Sun as a starDetection of overtone spacing, low-degree p modes
Solar-like oscillations in BooEquivalent width observations of Balmer lines
Kjeldsen et al., 1995, AJ,109, 1313
Kepler’s “best in class”The A-component of the solar-type binary 16 Cyg
Regularity in Scuti spectra?
Garcia Hernandez et al., 2009, A&A, 506, 79
Analysis of CoRoT observations of HD174936
Regularity in Scuti spectra?
Garcia Hernandez et al., 2009, A&A, 506, 79
Analysis of CoRoT observations of HD174936
Guilty as charged…
Toward automated peak-bagging of Sun-like stars
Appourchaux et al., 2012, A&A, 543, A54
Homogeneous analysis of 61 solar-type stars
Modelling and fitting “background”
Mathur et al., 2013, A&A, 549, 12
Instrumental, activity, granulation, shot noise
HD169392ACoRoT
Kepler’s “best in class”The A-component of the solar-type binary 16 Cyg
F-type star syndromeThe prototypical “Bl**dy F star” HD49933
Appourchaux et al., 2008, A&A, 488, 705Benomar et al., 2009, A&A, 507, L13
1200 1400 1600 1800 2000 2200 2400
Frequency (Hz)
F-type star syndrome
G-type star 16 Cyg A F-type star HD49933
Bl**dy F stars
Which one are you?Bayesian vs. Frequentist Humour
… and the nights flew by…
Acoustic glitches
Houdek & Gough MNRAS, 2007, 375, 861 MNRAS, 2011, 418, 1217
The Sun
Acoustic glitches
The F-type star HD49933
Red giant HR 7349
Mazumdar et al., 2012, A&A, 540, A31
Miglio et al., 2010, A&A, 520, L6
CoRoT Results
Acoustic glitches Kepler results
Mazumdar et al., 2013, ApJ, submitted
Examples: three solar-type stars
Buoyancy glitches CoRoT results
Degroote et al., 2010, Nature, 464, 259
B3V star HD 50320
Sequence of 1M stars
Increasingradius
main sequence
main sequence
sub giant
sub giant
red giant
Mixed modes and avoided crossings in sub-giants
Coupled oscillators KIC 6442183
See: Benomar et al., 2012, ApJ, 745, L33
Deheuvels & Michel, 2011, A&A, 535, A91
Period spacings in red giants
Mosser et al., 2012, A&A, 540, 143
Automated analysis of red-giant oscillation spectraStello et al., 2013, ApJ, 765, L41Mosser et al., 2011, A&A, 525, L9
Frequency (Hz)
1/ mod P (Hz)20 40 60
130
120
110
100
g-mode period spacings sdB starsReed et al., 2011 MNRAS, 414, 2885
Period spacings in red giants
Christensen-Dalsgaard, 2011, arXiv:1110.5012
inertia ratio
PLATO
End
Automated analysis of red-giant oscillation spectraStello et al., 2013, ApJ, 765, L41Mosser et al., 2011, A&A, 525, L9
1/ mod P (Hz)Fr
eque
ncy
(
Hz)
Internal rotation of a subgiantCore rotates five-times faster than surface
Deheuvels et al., 2012, ApJ, 756, 19
Kepler-50 and Kepler-65Two stars with multiple small planets
Chaplin et al., 2013, ApJ, 766, 101
Chaplin et al., 2013, ApJ, 766, 101
Spin-orbit alignmentKepler 50 and 65: stars with multiple small planets