Poster Abstracts - Kepler - NASA

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POSTER ABSTRACTSP0802. POSTER SESSION IISolar type pulsators on and near the Main Sequence E. Michel 1 , 1 Observatoire de Paris, LESIA, pl. J. Janssen,F92195 Meudon, France, Eric.Michel@obspm.fr.Introduction: Since acoustic oscillations havebeen observed in the Sun and their excitation mechanismunderstood, it has been clear that such oscillationshad to be present in a noticeably large domain ofmass and age covering low-mass stars to intermediateones and all the Main Sequence evolution phase atleast. The great success of helioseismology thus haslogically motivated a great interest for extending thistechnique to such stars. While first detections havebeen achieved from the ground, first precise measurementsof the modes in terms of eigenfrequencies, amplitudesand lifetimes, came only recently with spacephotometry observations. After more than four years inorbit, CoRoT has observed and measured oscillationsin about a dozen of such stars, most of them on theMain Sequence, from early F stars to objects veryclose to our Sun in terms of effective temperature andevolution stage. This sample is being enlarged by newCoRoT observations and by the Kepler data.I will discuss these results and show to which extentthey satisfy the expectation of the community interms of precision on the determination of the oscillationmodes parameters. I will also use this sample todiscuss what we already learned from them in terms ofstellar physics and beyond, for instance in the case ofstars hosting planets.1962011 Kepler Science Conference - NASA Ames Research Center
Asteroseismology of the solar-like star HAT-P-7: impact on thecharacterisation of its exoplanet companionPOSTER ABSTRACTSP0803. POSTER SESSION IIA. Grigahcène, M. Oshagh, O. BenOmar, M.-A. Dupret and M. J. P. F. G.MonteiroHat-P-7 is a very interesting star for more than one reason. First, it is a pulsating solar-like star, whichallows us to characterize it and probe its interior through the study of its pulsations. Second, it lieswithin the field of view of the NASA spacecraft Kepler. Which is areal advantage since it allows us toaccede to very high quality and continuous observational data. In these conditions, a seismologicalstudy of this star is expected to give very good estimations of the star parameters, such as its mass, age,radius, ... These results can be used as input for the characterisation of the exoplanet orbiting it, whichis the third reason to be interested by this star.In this work:1- we use the public Kepler data to estimate the star pulsation frequencies;2- we perform an asteroseismic study of the pulsating star using Time-Dependent-Convectionmodels;3- and we make a revision of the planet properties using the astroseismic results.2011 Kepler Science Conference - NASA Ames Research Center 197
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Poster Abstracts - Kepler - NASA

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