A&A 491, 883-888 (2008)
Extrasolar planets and brown dwarfs around A–F type stars
V. A planetary system found with HARPS around the F6IV–V star HD 60532M. Desort1, A.-M. Lagrange1, F. Galland1, H. Beust1, S. Udry2, M. Mayor2, and G. Lo Curto3
1 Laboratoire d'Astrophysique de Grenoble, UMR 5571 CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
2 Observatoire de Genève, Université de Genève, 51 chemin des Maillettes, 1290 Sauverny, Switzerland
3 European Southern Observatory, Alonso de Cordova 3107, Vitacura, Santiago, Chile
Received 22 May 2008 / Accepted 22 September 2008
Aims. In the framework of the search for extrasolar planets and brown dwarfs around early-type stars, we present the results obtained for the F-type main-sequence star HD 60532 (F6V) with HARPS.
Methods. Using 147 spectra obtained with HARPS at La Silla on a time baseline of two years, we studied the radial velocities of this star.
Results. HD 60532 radial velocities are periodically variable, and the variations have a Keplerian origin. This star is surrounded by a planetary system of two planets with minimum masses of 1 and 2.5 and orbital separations of 0.76 and 1.58 AU, respectively. We also detect high-frequency, small-amplitude (10 m s-1 peak-to-peak) pulsations. Dynamical studies of the system point toward a possible 3:1 mean-motion resonance that should be confirmed within the next decade.
Key words: techniques: radial velocities -- stars: early-type -- stars: planetary systems -- stars: individual: HD 60532 -- stars: oscillations
© ESO 2008