II. A Jovian planet on a long-period orbit around GJ 777 A
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, firstname.lastname@example.org
Accepted: 23 June 2003
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 MJup.
Key words: techniques: radial velocities / stars: individual: GJ 777 A / stars: individual: HD 190360 / stars: planetary systems
Based on observations made with the ELODIE echelle spectrograph mounted on the 1.93-m Telescope at the Observatoire de Haute-Provence (CNRS) and with the AFOE spectrograph mounted on the 1.5-m Telescope at the Fred Lawrence Whipple Observatory (SAO).
© ESO, 2003