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Recherche de planètes autour d'étoiles chaudes

Abstract : Only a small fraction of the 400 exoplanets discovered are orbiting stars more massive than solar-type stars. Detection of planets around such stars are needed to constrain planetary systems formation and evolution scenarii. This thesis was focused on A and F main-sequence stars. Precise enough radial velocities (RV) are difficult to get for those stars (few lines, high rotational velocity), and pulsations and magnetic activity may disturb those measurements and mimic the presence of planets. New observational surveys allowed us to detect planet candidates and to draw the first statistics of the presence of planets around A-F stars. Numerical simulations allowed us to simulate the effet of spots, plages and pulsations on RV, photometric and astrometric variations. We then performed a comprehensive and quantitative study of the effect of a spot on stars with various spectral types and for various configurations (location, size, vsini). We also simulated the effect of spots and plages (extracted from observations) on the sun RV as they would have been measured for more than one activity cycle. Thanks to these simulations, we studied the detectability of earth-mass planets in the habitable zone of solar-type stars.
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https://tel.archives-ouvertes.fr/tel-00528996
Contributor : Morgan Desort <>
Submitted on : Saturday, October 23, 2010 - 8:29:43 PM
Last modification on : Friday, November 6, 2020 - 4:11:24 AM
Long-term archiving on: : Friday, October 26, 2012 - 12:10:11 PM

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  • HAL Id : tel-00528996, version 1

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Citation

Morgan Desort. Recherche de planètes autour d'étoiles chaudes. Astrophysique [astro-ph]. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00528996⟩

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