The ELODIE survey for northern extra-solar planets^*,**

II. A Jovian planet on a long-period orbit around GJ 777 A

¹ Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
² Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA-02138, USA
³ High Altitude Observatory/National Center for Atmospheric Research, 3450 Mitchell Lane, Boulder, 80307, USA
⁴ Laboratoire d'Astrophysique, Observatoire de Grenoble, Université J. Fourier, BP 53, 38041 Grenoble, France
⁵ Observatoire de Haute-Provence, 04870 St-Michel L'Observatoire, France

Corresponding author: D. Naef, dominique.naef@obs.unige.ch

Received: 6 June 2003
Accepted: 23 June 2003

Abstract

We present radial-velocity measurements obtained with the ELODIE and AFOE spectrographs for GJ 777 A (HD 190360), a metal-rich ([Fe/H] = 0.25) nearby (d = 15.9 pc) star in a stellar binary system. A long-period low radial-velocity amplitude variation is detected revealing the presence of a Jovian planetary companion. Some of the orbital elements remain weakly constrained because of the smallness of the signal compared to our instrumental precision. The detailed orbital shape is therefore not well established. We present our best fitted orbital solution: an eccentric (e = 0.48) 10.7–year orbit. The minimum mass of the companion is 1.33 M_Jup.