Extrasolar planets and brown dwarfs around A–F type stars
III. Pictoris: looking for planets, finding pulsations
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
Accepted: 22 September 2005
In the frame of the search for extrasolar planets and brown dwarfs around early-type stars, we present the results obtained on β 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 β 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 δ Scuti type pulsations.
Key words: techniques: radial velocities / stars: early-type / stars: variables: δ Sct / stars: individual: β Pictoris
© ESO, 2006