David Ehrenreich University of Geneva, Department of Astronomy Xavier Bonfils Institut de Planetologie et d'Astrophysique de Grenoble Xavier Delfosse Universite de Grenoble I Thierry Forveille Universite de Grenoble I Michael Gillon Universite de Liege Christophe Lovis University of Geneva, Department of Astronomy Michel Mayor University of Geneva, Department of Astronomy Vasco Neves Universidade do Porto Nuno C Santos Institute of Astrophysics and Space Sciences (IA) - Lisbon Stephane Udry University of Geneva, Department of Astronomy