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, L41

Mosser 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, L41

Mosser et al., 2011, A&A, 525, L9

1/ mod P (Hz)

Fre

quen

cy

(H

z)

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