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Centro de Astrofísica da Universidade do Porto

The HARPS search for southern extra-solar planets
XXI. Three new giant planets orbiting the metal-poor stars HD5388, HD181720, and HD190984

N. C. Santos, M. Mayor, W. Benz, F. Bouchy, P. Figueira, G. Lo Curto, C. Lovis, C. Melo, C. Moutou, D. Naef, F. Pepe, D. Queloz, S. G. Sousa, S. Udry

We present the discovery of three new giant planets around three metal-deficient stars: HD5388 b (1.96MJup), HD181720 b (0.37Jup), and HD190984 b (3.1Jup). All the planets have moderately eccentric orbits (ranging from 0.26 to 0.57), and long orbital periods (from 777 to 4885 days). Two of the stars (HD181720 and HD190984) were part of a program searching for giant planets around a sample of ∼100 moderately metal-poor stars, while HD5388 was part of the volume-limited sample of the HARPS GTO program. Our discoveries suggest that giant planets in long period orbits are not uncommon around moderately metal-poor stars.

planets and satellites: formation – stars: abundances – stars: fundamental parameters – planetary systems – techniques: radial velocities – techniques: spectroscopic

Based on observations collected at the La Silla Parana Observatory, ESO (Chile) with the HARPS spectrograph at the 3.6-m telescope (ESO runs ID 72.C-0488 and 082.C-0212). Tables with the radial-velocities are only available in electronic form at the CDS via anonymous ftp to ( or via

Astronomy and Astrophysics
Volume 512, Page A47_1
March 2010

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Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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