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.
The GAPS programme with HARPS-N@TNG IV: A planetary system around XO-2S
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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.
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The GAPS Programme with HARPS-N at TNG LXXVII. Occurrence rates of small close-in planets in the presence of cold Jupiters
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.