@article{005b042d6d4f44c085115c0539f4f4aa,
title = "The GAPS programme with HARPS-N at TNG: VI. The curious case of TrES-4b",
abstract = "We update the TrES-4 system parameters using high-precision HARPS-N radial-velocity measurements and new photometric light curves. A combined spectroscopic and photometric analysis allows us to determine a spectroscopic orbit with a semi-amplitude K = 51 ± 3 ± s-1. The derived mass of TrES-4b is found to be Mp = 0.49 ± 0.04 MJup, significantly lower than previously reported. Combined with the large radius (Rp = 1.84+0.08-0.09 RJup) inferred from our analysis, TrES-4b becomes the transiting hot Jupiter with the second-lowest density known. We discuss several scenarios to explain the puzzling discrepancy in the mass of TrES-4b in the context of the exotic class of highly inflated transiting giant planets.",
keywords = "Planetary systems, Stars: individual: TrES-4b, Techniques: photometric, Techniques: radial velocities, Techniques: spectroscopic",
author = "A. Sozzetti and Bonomo, {A. S.} and K. Biazzo and L. Mancini and M. Damasso and S. Desidera and R. Gratton and Lanza, {A. F.} and E. Poretti and M. Rainer and L. Malavolta and L. Affer and M. Barbieri and Bedin, {L. R.} and C. Boccato and M. Bonavita and F. Borsa and S. Ciceri and Claudi, {R. U.} and D. Gandolfi and P. Giacobbe and T. Henning and C. Knapic and Latham, {D. W.} and G. Lodato and A. Maggio and J. Maldonado and F. Marzari and {Martinez Fiorenzano}, {A. F.} and G. Micela and E. Molinari and C. Mordasini and V. Nascimbeni and I. Pagano and M. Pedani and F. Pepe and G. Piotto and N. Santos and G. Scandariato and E. Shkolnik and J. Southworth",
note = "Funding Information: The GAPS project in Italy acknowledges support from INAF through the “Progetti Premiali” funding scheme of the Italian Ministry of Education, University, and Research. We thank the TNG staff for help with the observations. This research has made use of the results produced by the PI2S2 Project managed by the Consorzio COMETA, a co-funded project by the Italian Ministero dell{\textquoteright}Istruzione, Universit{\`a} e Ricerca (MIUR) within the Piano Operativo Nazionale Ricerca Scientifica, Sviluppo Tecnologico, Alta Formazione (PON 2000-2006). N.C.S. acknowledges the support from the ERC/EC under the FP7 through Starting Grant agreement n. 239953, from Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia (FCT, Portugal), and POPH/FSE (EC) through FEDER funds in program COMPETE, as well as through and national funds, in the form of grants references RECI/FIS-AST/0176/2012 (FCOMP-01-0124-FEDER-027493), RECI/FIS-AST/0163/2012 (FCOMP-01-0124-FEDER-027492), and IF/00169/2012. Operations at the Calar Alto telescope are jointly performed by the Max-Planck Institut f{\"u}r Astronomie (MPIA) and the Instituto de Astrof{\'i}sica de Andaluc{\'i}a (CSIC). Publisher Copyright: {\textcopyright} 2015 ESO.",
year = "2015",
month = mar,
doi = "10.1051/0004-6361/201425570",
language = "English (US)",
volume = "575",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",
}