The HARPS search for southern extra-solar planets

Free access article

Issue		A&A Volume 439, Number 1, August III 2005


Page(s)		367 - 373
Section		Planets and planetary systems
DOI		http://dx.doi.org/10.1051/0004-6361:20052826

A&A 439, 367-373 (2005)
DOI: 10.1051/0004-6361:20052826

IV. Three close-in planets around HD 2638, HD 27894 and HD 63454

C. Moutou¹, M. Mayor², F. Bouchy¹, C. Lovis², F. Pepe², D. Queloz², N. C. Santos³, S. Udry², W. Benz⁴, G. Lo Curto⁵, D. Naef^{2, 5}, D. Ségransan² and J.-P. Sivan¹

¹ Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, 13376 Marseille Cedex 12, France
e-mail: claire.moutou@oamp.fr
² Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
³ Centro de Astronomia e Astrofísica da Universidade de Lisboa, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal
⁴ Physikalisches Institut Universität Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
⁵ ESO, Alonso de Cordoba 3107, Vitacura Casilla 19001, Santiago, Chile

(Received 7 February 2005 / Accepted 22 March 2005 )

Abstract
We report the discovery of three new planets, detected through Doppler measurements with the instrument HARPS installed on the ESO 3.6 m telescope, La Silla, Chile. These planets are orbiting the main-sequence stars HD 2638, HD 27894, and HD 63454. The orbital characteristics that best fit the observed data are depicted in this paper, as well as the stellar and planetary parameters. The planets' minimum mass is 0.48, 0.62, and 0.38 M_Jup for respectively HD 2638, HD 27894, and HD 63454; the orbital periods are 3.4442, 17.991, and 2.817822 days, corresponding to semi-major axis of 0.044, 0.122, and 0.036 AU, respectively. The observational data are carefully analysed for activity-induced effects and we conclude on the reliability of the observed radial-velocity variations as of exoplanetary origin. These three planets support the correlation between the star metallicity and the presence of planets (especially at short orbital distances), pointing towards the peculiar scenario of formation and migration of hot Jupiters.

Key words: stars: individual: HD 2638 -- stars: individual: HD 27894 -- HD 63454 -- stars: planetary systems -- techniques: radial velocities -- techniques: spectroscopic

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