Extrasolar planets and brown dwarfs around A-F type stars
III. Pictoris: looking for planets, finding pulsationsF. 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
2 Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
(Received 20 August 2005 / 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 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 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 at a distance to the star of 0.05 AU, 9 at 1 AU). We also discuss the origin of the observed radial velocity variations in terms of Scuti type pulsations.
Key words: techniques: radial velocities -- stars: early-type -- stars: variables: Sct -- stars: individual: Pictoris
© ESO 2006