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

F. Galland (1) , A.-M. Lagrange (1) , S. Udry , A. Chelli (1) , F. Pepe , J.-L. Beuzit (1) , M. Mayor

1 LAOG - Laboratoire d'Astrophysique de Grenoble

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 M_Jup at a distance to the star of 0.05 AU, 9 M_Jup at 1 AU). We also discuss the origin of the observed radial velocity variations in terms of δ Scuti type pulsations.

F. Galland, A.-M. Lagrange, S. Udry, A. Chelli, F. Pepe, et al.. Extrasolar planets and brown dwarfs around A-F type stars. III. beta Pictoris: looking for planets, finding pulsations. Astronomy and Astrophysics - A&A, 2006, 447, pp.355-359. ⟨10.1051/0004-6361:20054080⟩. ⟨hal-00398214⟩