The GAPS programme with HARPS-N at TNG: V. A comprehensive analysis of the XO-2 stellar and planetary systems

XO-2 is the first confirmed wide stellar binary system where the almost twin components XO-2N and XO-2S have planets, and it is a peculiar laboratory in which to investigate the diversity of planetary systems. This stimulated a detailed characterization study of the stellar and planetary components...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2015-03, Vol.575, p.A111
Main Authors: Damasso, M, Biazzo, K, Bonomo, A S, Desidera, S, Lanza, A F, Nascimbeni, V, Esposito, M, Scandariato, G, Sozzetti, A, Cosentino, R
Format: Article
Language:English
Subjects:
Atmospherics
Parameters
Photometry
Planetary systems
Radial velocity
Spectra
Spectrographs
Transit
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Summary:XO-2 is the first confirmed wide stellar binary system where the almost twin components XO-2N and XO-2S have planets, and it is a peculiar laboratory in which to investigate the diversity of planetary systems. This stimulated a detailed characterization study of the stellar and planetary components based on new observations. We collected high-resolution spectra with the HARPS-N spectrograph and multi-band light curves. Spectral analysis led to an accurate determination of the stellar atmospheric parameters and characterization of the stellar activity, and high-precision radial velocities of XO-2N were measured. We collected 14 transit light curves of XO-2Nb used to improve the transit parameters. Photometry provided accurate magnitude differences between the stars and a measure of their rotation periods. The iron abundance of XO-2N was found to be +0.054 dex greater, within more than 3[sigma], than that of XO-2S. The existence of a long-term variation in the radial velocities of XO-2N is confirmed, and we detected a turnover with respect to previous measurements.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201425332