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Doctoral thesis
Open access
English

Observing exoplanet populations with high-precision astrometry

ContributorsSahlmann, Johannes
Defense date2012-06-28
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.

eng
Keywords
  • Astronomie
  • Astronomy
  • Astrophysique
  • Astrophysics
  • Planète
  • Planet
  • Planètes
  • Planets
  • Extrasolaire
  • Extrasolar
  • Exoplanètes
  • Exoplanets
  • Astrometry
  • Brown dwarf
  • Interferometry
  • Instrumentation
  • Vitesses Radiales
  • Radial Velocities
  • Doppler
  • HARPS
  • CORALIE
  • PRIMA
  • FORS
  • HIPPARCOS
Citation (ISO format)
SAHLMANN, Johannes. Observing exoplanet populations with high-precision astrometry. 2012. doi: 10.13097/archive-ouverte/unige:22848
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Technical informations

Creation08/30/2012 3:55:00 PM
First validation08/30/2012 3:55:00 PM
Update time03/14/2023 5:40:34 PM
Status update03/14/2023 5:40:34 PM
Last indexation01/29/2024 7:31:57 PM
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