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Centro de Astrofísica da Universidade do Porto

The HARPS search for southern extra-solar planets
XII. A giant planet orbiting the metal-poor star HD171028

N. C. Santos, M. Mayor, F. Bouchy, F. Pepe, D. Queloz, S. Udry

Abstract
In this paper we present the detection of a 1.8MJup planet in a 538 day period trajectory orbiting the metal-poor star HD171028 ([Fe/H]=−0.49). This planet is the first to be discovered in the context of a HARPS program searching for planets around metalpoor
stars. Interestingly, HD171028 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.

Keywords
stars: planetary systems – planetary systems: formation – techniques: radial velocity – stars: abundances

Astronomy and Astrophysics
Volume 474, Page 647
November 2007

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