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The ELODIE survey for northern extra-solar planets IV. HD196885, a close binary star with a 3.7-year planet

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

Abstract
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 HD196885 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, HD196885 B, and give some constraints on its orbit.

Astronomy and Astrophysics
Volume 479, Page 271
2008 February

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Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia