Paper: astro-ph/0510424
Date: Fri, 14 Oct 2005 09:52:11 GMT (123kb)

Title: Extrasolar planets and brown dwarfs around A-F type stars III.
Beta-Pictoris: looking for planets, finding pulsations

Authors: F. Galland, A. M. Lagrange, S. Udry, A. Chelli, F. Pepe, J. L. Beuzit,
M. Mayor

Comments: 5 pages. Final version, accepted for publication (A&A)
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In the frame of the search for extrasolar planets and brown dwarfs around
early-type stars, we present the results obtained on Beta-Pictoris, which is
surrounded by a circumstellar disk that is warped by the presence of a planet.
We used 97 spectra acquired with CORALIE and 230 spectra acquired with HARPS to
characterize the radial velocity behavior of Beta-Pictoris and to infer
constraints on the presence of a planet close to this star. With these data, we
were able to exclude the presence of an inner giant planet (2 MJup at a
distance to the star of 0.05 AU, 9 MJup at 1 AU). We also discuss the origin of
the observed radial velocity variations in terms of Delta-Scuti type
pulsations.

\\ ( http://arXiv.org/abs/astro-ph/0510424 , 123kb)