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.

The GAPS programme with HARPS-N at TNG: IV. A planetary system around XO-2S

GANDOLFI, Davide;
2014-01-01

Abstract

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.
2014
Inglese
Esperti anonimi
567
L6
1
6
6
http://www.aanda.org/articles/aa/abs/2014/07/aa24339-14/aa24339-14.html
Rassegna stampa: http://www.media.inaf.it/2014/07/02/gemelli-diversi/
Planetary systems; Stars: individual: XO-2N; Stars: individual: XO-2S; Techniques: radial velocities; Astronomy and Astrophysics; Space and Planetary Science
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Desidera, S.; Bonomo, A.S.; Claudi, R.U.; Damasso, M.; Biazzo, K.; Sozzetti, A.; Marzari, F.; Benatti, S.; Gandolfi, D.; Gratton, R.; Lanza, A.F.; Nas...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1619742
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