Volume 474, Number 2, November I 2007
|Page(s)||647 - 651|
|Section||Planets and planetary systems|
|Published online||10 September 2007|
The HARPS search for southern extra-solar planets*
XII. A giant planet orbiting the metal-poor star HD 171028
Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal e-mail: firstname.lastname@example.org
2 Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
3 Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis Bd Arago, 75014 Paris, France
Accepted: 7 August 2007
In this paper we present the detection of a 1.8 planet in a 538-day period trajectory orbiting the metal-poor star HD 171028 ([Fe/H] = -0.49). This planet is the first to be discovered in the context of a HARPS program searching for planets around metal-poor stars. Interestingly, HD 171028 is one of the least metal-poor stars in the sample. This discovery is placed in the context of the models of planet formation and evolution.
Key words: stars: planetary systems / planetary systems: formation / techniques: radial velocity / stars: abundances
© ESO, 2007
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