%0 Journal Article
%T The GAPS programme with HARPS-N@TNG IV: A planetary system around XO-2S
%A S. Desidera
%A A. S. Bonomo
%A R. U. Claudi
%A M. Damasso
%A K. Biazzo
%A A. Sozzetti
%A F. Marzari
%A S. Benatti
%A D. Gandolfi
%A R. Gratton
%A A. F. Lanza
%A V. Nascimbeni
%A G. Andreuzzi
%A L. Affer
%A M. Barbieri
%A L. R. Bedin
%A A. Bignamini
%A M. Bonavita
%A F. Borsa
%A P. Calcidese
%A J. M. Christille
%A R. Cosentino
%A E. Covino
%A M. Esposito
%A P. Giacobbe
%A A. Harutyunyan
%A D. Latham
%A M. Lattanzi
%A G. Leto
%A G. Lodato
%A C. Lovis
%A A. Maggio
%A L. Malavolta
%A L. Mancini
%A A. F. Martinez Fiorenzano
%A G. Micela
%A E. Molinari
%A C. Mordasini
%A U. Munari
%A I. Pagano
%A M. Pedani
%A F. Pepe
%A G. Piotto
%A E. Poretti
%A M. Rainer
%A I. Ribas
%A N. C. Santos
%A G. Scandariato
%A R. Silvotti
%A J. Southworth
%A R. Zanmar Sanchez
%J Physics
%D 2014
%I arXiv
%R 10.1051/0004-6361/201424339
%X We performed an intensive radial velocity monitoring of XO-2S, the wide companion of the transiting planet-host XO-2N, using HARPS-N at TNG in the framework of the GAPS programme. The radial velocity measurements indicate the presence of a new planetary system formed by a planet that is slightly more massive than Jupiter at 0.48 au and a Saturn-mass planet at 0.13 au. Both planetary orbits are moderately eccentric and were found to be dynamically stable. There are also indications of a long-term trend in the radial velocities. This is the first confirmed case of a wide binary whose components both host planets, one of which is transiting, which makes the XO-2 system a unique laboratory for understanding the diversity of planetary systems.
%U http://arxiv.org/abs/1407.0251v1