EDP Sciences
Free Access
Volume 369, Number 2, April II 2001
Page(s) L22 - L25
Section Letters
DOI https://doi.org/10.1051/0004-6361:20010252

A&A 369, L22-L25 (2001)
DOI: 10.1051/0004-6361:20010252

The Hipparcos observations and the mass of sub-stellar objects

D. Pourbaix1, 2

1  Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP 226, boulevard du Triomphe, 1050 Bruxelles, Belgium
2  Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544-1001, USA

(Received 28 November 2000 / Accepted 16 February 2001)

The Hipparcos Intermediate Astrometric Data have been used lately to estimate the inclination of the orbital plane of candidate extrasolar planets. Whereas most of these investigations derive almost face-on orbits, we show that the astrometric data are seldom precise enough to undertake such studies and that the "face-on"result might be just a spurious effect of the method.

Key words: methods: data analysis -- astrometry -- stars: planetary systems

Offprint request: D. Pourbaix, pourbaix@astro.ulb.ac.be

SIMBAD Objects

© ESO 2001