EDP Sciences
Free access
Issue
A&A
Volume 372, Number 3, June IV 2001
Page(s) 935 - 944
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20010597


A&A 372, 935-944 (2001)
DOI: 10.1051/0004-6361:20010597

Screening the Hipparcos-based astrometric orbits of sub-stellar objects

D. Pourbaix1, 2 and F. Arenou3

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
3  UMR 8633 CNRS/DASGAL, Observatoire de Paris, 5 place J. Janssen, 92195 Meudon Cedex, France

(Received 14 March 2001 / Accepted 23 April 2001)

Abstract
The combination of Hipparcos astrometric data with the spectroscopic data of putative extrasolar planets seems to indicate that a significant fraction of these low-mass companions could be brown or M dwarfs (Han et al. 2001). We show that this is due to the adopted reduction procedure, and consequently that the Hipparcos data do not reject the planetary mass hypothesis in all but one cases. Additional companions, undetected so far, might also explain the large astrometric residuals of some of these stars.


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

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

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