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Issue A&A
Volume 447, Number 1, February III 2006
Page(s) 355 - 359
Section Planets and planetary systems
DOI 10.1051/0004-6361:20054080

A&A 447, 355-359 (2006)
DOI: 10.1051/0004-6361:20054080

Extrasolar planets and brown dwarfs around A-F type stars

III. $\mathsf{\beta}$ Pictoris: looking for planets, finding pulsations
F. Galland1, 2, A.-M. Lagrange1, S. Udry2, A. Chelli1, F. Pepe2, J.-L. Beuzit1 and M. Mayor2

1  Laboratoire d'Astrophysique de l'Observatoire de Grenoble, Université Joseph Fourier, BP 53, 38041 Grenoble, France
    e-mail: Franck.Galland@obs.ujf-grenoble.fr
2  Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland

(Received 20 August 2005 / Accepted 22 September 2005 )

Abstract
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  $M_{\rm Jup}$ at a distance to the star of 0.05 AU, 9  $M_{\rm Jup}$ at 1 AU). We also discuss the origin of the observed radial velocity variations in terms of $\delta$ Scuti type pulsations.


Key words: techniques: radial velocities -- stars: early-type -- stars: variables: $\delta$ Sct -- stars: individual: $\beta$ Pictoris

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