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

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arxiv 1407.0251 v1 pith:N7AXDJHI submitted 2014-07-01 astro-ph.EP

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

S. Desidera , A.S. Bonomo , R.U. Claudi , M. Damasso , K. Biazzo , A. Sozzetti , F. Marzari , S. Benatti
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D. Gandolfi R. Gratton A.F. Lanza V. Nascimbeni G. Andreuzzi L. Affer M. Barbieri L.R. Bedin A. Bignamini M. Bonavita F. Borsa P. Calcidese J.M. Christille R. Cosentino E. Covino M. Esposito P. Giacobbe A. Harutyunyan D. Latham M. Lattanzi G. Leto G. Lodato C. Lovis A. Maggio L. Malavolta L. Mancini A.F. Martinez Fiorenzano G. Micela E. Molinari C. Mordasini U. Munari I. Pagano M. Pedani F. Pepe G. Piotto E. Poretti M. Rainer I. Ribas N.C. Santos G. Scandariato R. Silvotti J. Southworth R. Zanmar Sanchez
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keywords planetaryradialsystemgapsharps-nplanetprogrammetransiting
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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.

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Cited by 2 Pith papers

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  1. The GAPS Programme with HARPS-N at TNG LXXVII. Occurrence rates of small close-in planets in the presence of cold Jupiters

    astro-ph.EP 2026-07 accept novelty 6.0

    Close-in small planets occur at ~5–16% around cold-Jupiter hosts, with no strong overall correlation at average stellar mass/metallicity, but elevated rates in dynamically stable inner regions.

  2. The GAPS Programme with HARPS-N at TNG LXXVII. Occurrence rates of small close-in planets in the presence of cold Jupiters

    astro-ph.EP 2026-07 accept novelty 5.5

    Occurrence rates of hot/warm/cool Neptunes and Super-Earths around cold-Jupiter hosts are ~5–16%, higher when the outer giant leaves a stable inner zone, with no strong ISP–CJ correlation at average metallicity.