Des étoiles de très faibles masses aux planètes: contraintes des modèles d'évolution par analyse combinée de vitesses radiales et d'imagerie à haut contraste

Diplôme Thèse Des étoiles de très faibles masses aux planètes: contraintes des modèles d'évolution par analyse combinée de vitesses radiales et d'imagerie à haut contraste fre 2018-06-22 author Peretti Sébastien 682774 director Udry Stéphane 23409 10.13097/archive-ouverte/unige:109514 urn:nbn:ch:unige-1095141 Sc. 5263 Formation and evolution of stars and substellar objects (brown dwarfs and planets) are described by theoretical models. Observers can use these models to determine several parameters of an object taken observables. However, these models still need to be properly tested and calibrated with observations. The purpose of this thesis is to bring some constrain to stellar and substellar formation and evolutionary models. I combined the high contrast imaging and radial-velocity methods to study substellar objects at wide separation and stellar systems of very low mass stars. This combination of techniques allow to determine the dynamical masses of the objects inside a system. Thanks to the high contrast imaging, photons coming directly from the objects can be collected which allowed me to characterize the atmosphere of substellar objects with a spectral analyze. These informations allow to put some constrain to evolutionary models of substellar objects. Star Substellar Planet Brown-dwarf High contrast imaging Radial-velocity SPHERE Dewey 520 26 Département d'astronomie 12 false 862 Direction de recherche "Planètes extrasolaires" eba35d26-1d8e-46e9-a2d5-13a653b9d47d Thesis Public These_S_PERETTI_final.pdf 90940521 application/pdf Private 2019-10-17 707bac33a797ab60f3c7e4a1431209b62ec48213e32701d8699272d563f1e44a openAccess Faculté des sciences / Département d'astronomie

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Des étoiles de très faibles masses aux planètes: contraintes des modèles d'évolution par analyse combinée de vitesses radiales et d'imagerie à haut contraste				2018	624	224

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Peretti, Sébastien