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

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

2001-04-25

arxiv.org/abs/astro-ph/0104412v1

Astronomy and Astrophysics

Astrophysics

9 pages, 7 figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20010597

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.

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