The HARPS search for southern extrasolar planets ^⋆,⋆⋆

XXIII. 8 planetary companions to low-activity solar-type stars

D. Naef¹, M. Mayor¹, G. Lo Curto², F. Bouchy^3,4, C. Lovis¹, C. Moutou⁵, W. Benz⁶, F. Pepe¹, D. Queloz¹, N. C. Santos⁷, D. Ségransan¹, S. Udry¹, X. Bonfils^1,8, X. Delfosse⁸, T. Forveille⁸, G. Hébrard³, C. Mordasini^6,9, C. Perrier⁸, I. Boisse³ and D. Sosnowska¹

¹ Observatoire Astronomique de l’Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
e-mail: dominique.naef@unige.ch
² European Southern Observatory, Karl Schwarzschild Strasse 2, 85748 Garching bei München, Germany
³ Institut d’Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis boulevard Arago, 75014 Paris, France
⁴ Observatoire de Haute-Provence, 04870 St-Michel L’Observatoire, France
⁵ Laboratoire d’Astrophysique de Marseille, OAMP, Université Aix-Marseille and CNRS, 38 rue Frédéric Jolliot-Curie, 13388 Marseille Cedex 13, France
⁶ Physikalisches Institut Universität Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
⁷ Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
⁸ Laboratoire d’Astrophysique de Grenoble, UMR5571 CNRS, Université Joseph Fourrier, BP 53, 38041 Grenoble Cedex 9, France
⁹ Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany

Received: 6 November 2009
Accepted: 10 August 2010

Abstract

In this paper, we present our HARPS radial-velocity data for eight low-activity solar-type stars belonging to the HARPS volume-limited sample: HD 6718, HD 8535, HD 28254, HD 290327, HD 43197, HD 44219, HD 148156, and HD 156411. Keplerian fits to these data reveal the presence of low-mass companions around these targets. With minimum masses ranging from 0.58 to 2.54 M_Jup, these companions are in the planetary mass domain. The orbital periods of these planets range from slightly less than one to almost seven years. The eight orbits presented in this paper exhibit a wide variety of eccentricities: from 0.08 to above 0.8.