oscillation spectra with regular patterns
DESCRIPTION
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 diagram. Aerts, Christensen-Dalsgaard & Kurtz (2009). . - PowerPoint PPT PresentationTRANSCRIPT
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Oscillation spectra with
regular patterns
Bill Chaplin, School of Physics & Astronomy University of Birmingham
IAU Symposium 301, 2013 August 20
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Ah! signatures of terrestrial seismology
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Pulsations in the HR diagramAerts, Christensen-Dalsgaard & Kurtz (2009)
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asteroseismic solar-type &
red-giant targets
CoRoT ground-based
telescopes
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asteroseismic solar-type &
red-giant targets
Kepler
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CoRoT
De Ridder et al. 2009, Nature 459, 398
Non-radial oscillations in red giants
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Asteroseismic KOI ensembleHigh-quality solar-like oscillations spectra of
Kepler Objects of Interest
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Courtesy T. Roca Cortés
Helioseismology: Sun as a starDetection of overtone spacing, low-degree p modes
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Solar-like oscillations in BooEquivalent width observations of Balmer lines
Kjeldsen et al., 1995, AJ,109, 1313
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Kepler’s “best in class”The A-component of the solar-type binary 16 Cyg
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Regularity in Scuti spectra?
Garcia Hernandez et al., 2009, A&A, 506, 79
Analysis of CoRoT observations of HD174936
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Regularity in Scuti spectra?
Garcia Hernandez et al., 2009, A&A, 506, 79
Analysis of CoRoT observations of HD174936
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Guilty as charged…
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Toward automated peak-bagging of Sun-like stars
Appourchaux et al., 2012, A&A, 543, A54
Homogeneous analysis of 61 solar-type stars
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Modelling and fitting “background”
Mathur et al., 2013, A&A, 549, 12
Instrumental, activity, granulation, shot noise
HD169392ACoRoT
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Kepler’s “best in class”The A-component of the solar-type binary 16 Cyg
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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)
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F-type star syndrome
G-type star 16 Cyg A F-type star HD49933
Bl**dy F stars
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Which one are you?Bayesian vs. Frequentist Humour
… and the nights flew by…
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Acoustic glitches
Houdek & Gough MNRAS, 2007, 375, 861 MNRAS, 2011, 418, 1217
The Sun
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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
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Acoustic glitches Kepler results
Mazumdar et al., 2013, ApJ, submitted
Examples: three solar-type stars
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Buoyancy glitches CoRoT results
Degroote et al., 2010, Nature, 464, 259
B3V star HD 50320
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Sequence of 1M stars
Increasingradius
main sequence
main sequence
sub giant
sub giant
red giant
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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
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Period spacings in red giants
Mosser et al., 2012, A&A, 540, 143
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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
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g-mode period spacings sdB starsReed et al., 2011 MNRAS, 414, 2885
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Period spacings in red giants
Christensen-Dalsgaard, 2011, arXiv:1110.5012
inertia ratio
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PLATO
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End
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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)
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Internal rotation of a subgiantCore rotates five-times faster than surface
Deheuvels et al., 2012, ApJ, 756, 19
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Kepler-50 and Kepler-65Two stars with multiple small planets
Chaplin et al., 2013, ApJ, 766, 101
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Chaplin et al., 2013, ApJ, 766, 101
Spin-orbit alignmentKepler 50 and 65: stars with multiple small planets