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Magnétisme, activité et interactions magnétosphériques dans les systèmes étoile/planète géante proche

Abstract : Extrasolar planets at small orbital distances (hot Jupiters)interact with their hosting star in several ways: irradiation, gravitation, flow of particles and magnetic fields. The planet, embedded in the large-scale stellar magnetic field throughout its orbit, can influence the star in the form of induced photospheric activity, or by influencing the stellar magnetic field via tidal interactions. Over the course of this PhD, spectropolarimetric observations of a sample of stars with a hot Jupiter allowed me to study their magnetic structure and evolution via Zeeman-Doppler Imaging. These stars show similar magnetic properties to other cool stars without Hot Jupiter. But, for the first time, a magnetic cycle on a star other than the Sun was observed. Compared to the solar cycle, this cycle is accelerated, suggesting that the planet may influence the stellar magnetic field. I have also used a second method to study the planet's influence on the star : the stellar activity. In addition to this observational study, I have examined the coronal magnetic field by extrapolating the surface magnetograms. I was thus able to calculate the magnetic budget at the planet's orbit, an important ingredient for my estimations of the planetary radio flux.
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https://tel.archives-ouvertes.fr/tel-00600939
Contributor : Williams Exbrayat <>
Submitted on : Thursday, June 16, 2011 - 11:18:32 AM
Last modification on : Thursday, October 15, 2020 - 4:07:35 AM
Long-term archiving on: : Saturday, September 17, 2011 - 2:21:46 AM

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  • HAL Id : tel-00600939, version 1

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Rim Fares. Magnétisme, activité et interactions magnétosphériques dans les systèmes étoile/planète géante proche. Astrophysique [astro-ph]. Université Paul Sabatier - Toulouse III, 2011. Français. ⟨tel-00600939⟩

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