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Observing exoplanet populations with high-precision astrometry

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Defense Thèse de doctorat : Univ. Genève, 2012 - Sc. 4441 - 2012/06/28
Abstract This thesis deals with the application of the astrometry technique, consisting in measuring the position of a star in the plane of the sky, for the discovery and characterisation of extra-solar planets. It is feasible only with a very high measurement precision, which motivates the use of space observatories, the development of new ground-based astronomical instrumentation and of innovative data analysis methods: The study of Sun-like stars with substellar companions using CORALIE radial velocities and HIPPARCOS astrometry leads to the determination of the frequency of close brown dwarf companions and to the discovery of a dividing line between massive planets and brown dwarf companions; An observation campaign employing optical imaging with a very large telescope demonstrates sufficient astrometric precision to detect planets around ultra-cool dwarf stars and the first results of the survey are presented; Finally, the design and initial astrometric performance of PRIMA, a new dual-feed near-infrared interferometric observing facility for relative astrometry is presented.
Keywords AstronomieAstronomyAstrophysiqueAstrophysicsPlanètePlanetPlanètesPlanetsExtrasolaireExtrasolarExoplanètesExoplanetsAstrometryBrown dwarfInterferometryInstrumentationVitesses RadialesRadial VelocitiesDopplerHARPSCORALIEPRIMAFORSHIPPARCOS
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URN: urn:nbn:ch:unige-228481
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SAHLMANN, Johannes. Observing exoplanet populations with high-precision astrometry. Université de Genève. Thèse, 2012. https://archive-ouverte.unige.ch/unige:22848

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Deposited on : 2012-09-12

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