Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001sf2a.conf..523l&link_type=abstract
Abstracts from SF2A-2001: Semaine de l'Astrophysique Francaise, meeting held in Lyon, France, May 28-June 1st, 2001, Eds.: F. Co
Astronomy and Astrophysics
Astrophysics
Scientific paper
VLTI (VLT Interferometry) in the astrometric configuration (PRIMA) should provide an astrometric precision of a few tens of microarcseconds. This high precision is appropriate to search indirectly, via the reflex motion of the central star, extra-solar planets of Saturn mass or larger with orbital periods of a few years. This search is complementary to the radial velocity technique in the mass-orbital period domain (plane). Such a high precision astrometric measurement of a stellar wobble by VLTI/PRIMA requires differential measurements between the target star and an angularly nearby reference star and requires proper signal-to-noise ratio. We shall draw up the list of target stars, located within 10 parcsec to maximize the wobble, that have proper reference stars and magnitudes for successful observations. We shall outline a long-term programm for extra-solar planet search with the VLTI. Differently, we shall briefly show that the millimeter wave array ALMA has also an interesting potential to search astrometricly for extra-solar planets.
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