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The GAPS programme with HARPS-N at TNG. VI. The curious case of TrES-4b

Journal
Date Issued
2015
Author(s)
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Mancini, L.
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Barbieri, M.
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Bonavita, M.
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Ciceri, S.
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Gandolfi, D.
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Henning, T.
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Latham, D. W.
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Lodato, G.
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Marzari, F.
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Martinez Fiorenzano, A. F.
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Mordasini, C.
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Pedani, M.
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Pepe, F.
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Piotto, G.
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Santos, N.
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Shkolnik, E.
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Southworth, J.
DOI
Description
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’Istruzione, Università 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 Fundação para a Ciência 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 für Astronomie (MPIA) and the Instituto de Astrofísica de Andalucía (CSIC).
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 m 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 () 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.

Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Fundacion Galileo Galilei of the INAF at the Spanish Observatorio del Roque de los Muchachos of the IAC in the frame of the program Global Architecture of Planetary Systems (GAPS), and with the Zeiss 1.23-m telescope at the German-Spanish Astronomical Center at Calar Alto, Spain. Tables 1 and 3 are available in electronic form at http://www.aanda.org

Volume
575
Start page
L15
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2015A&A...575L..15S
Rights
open.access
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