The ELODIE survey for northern extra-solar planets. IV. HD 196885, a close binary star with a 3.7-year planet

A. C. M. Correia , S. Udry , M. Mayor , A. Eggenberger (1) , D. Naef , J.-L. Beuzit (1) , C. Perrier (1) , D. Queloz , J.-P. Sivan , F. Pepe , N. C. Santos , D. Ségransan

1 LAOG - Laboratoire d'Astrophysique de Grenoble

Aims.We aim to significantly increase the number of detected extra-solar planets in a magnitude-limited sample to improve our knowledge of their orbital element distributions and thus obtain better constraints for planet-formation models. Methods: Radial-velocity data were taken at Haute-Provence Observatory (OHP, France) with the ELODIE echelle spectrograph. Results: We report the presence of a planet orbiting HD 196885 A, with an orbital period of 1349 days. This star was previously suggested to host a 386 -day planet, but we cannot confirm its existence. We also detect the presence of a stellar companion, HD 196885 B, and give some constraints on its orbit.

A. C. M. Correia, S. Udry, M. Mayor, A. Eggenberger, D. Naef, et al.. The ELODIE survey for northern extra-solar planets. IV. HD 196885, a close binary star with a 3.7-year planet. Astronomy and Astrophysics - A&A, 2008, 479, pp.271. ⟨10.1051/0004-6361:20078908⟩. ⟨hal-00398445⟩