Astrometric Masses of Extrasolar Planets and Brown Dwarfs

Details Astrometric Masses of Extrasolar Planets and Brown Dwarfs Astrometric Masses of Extrasolar Planets and Brown Dwarfs

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10704b&link_type=abstract

HST Proposal ID #10704

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #10704

Scientific paper

We propose observations with HST/FGS to estimate the astrometric elements {perturbation orbit semi-major axis and inclination} of extra-solar planets orbiting six stars. These companions were originally detected by radial velocity techniques. We have demonstrated that FGS astrometry of even a short segment of reflex motion, when combined with extensive radial velocity information, can yield useful inclination information {McArthur et al. 2004}, allowing us to determine companion masses. Extrasolar planet masses assist in two ongoing research frontiers. First, they provide useful boundary conditions for models of planetary formation and evolution of planetary systems. Second, knowing that a star in fact has a plantary mass companion, increases the value of that system to future extrasolar planet observation missions such as SIM PlanetQuest, TPF, and GAIA.

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