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Sozzetti, A, Bonomo, AS, Biazzo, K, Mancini, L, Damasso, M, Desidera, S, Gratton, R, Lanza, AF, Poretti, E, Rainer, M, Malavolta, L, Affer, L, Barbieri, M, Bedin, LR, Boccato, C, Bonavita, M, Borsa, F, Ciceri, S, Claudi, RU, Gandolfi, D, Giacobbe, P, Henning, T, Knapic, C, Latham, DW, Lodato, G, Maggio, A, Maldonado, J, Marzari, F, Martinez Fiorenzano, AF, Micela, G, Molinari, E, Mordasini, C, Nascimbeni, V, Pagano, I, Pedani, M, Pepe, F, Piotto, G, Santos, N, Scandariato, G, Shkolnik, E and Southworth, J (2015) The GAPS programme with HARPS-N at TNG VI. The curious case of TrES-4b. ASTRONOMY & ASTROPHYSICS, 575. ISSN 1432-0746

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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 (Rp = 1.84-0.09+0.08 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.

Item Type: Article
Uncontrolled Keywords: stars: individual: TrES-4b, planetary systems, techniques: radial velocities, techniques: spectroscopic, techniques: photometric
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 11 Nov 2015 11:32
Last Modified: 03 May 2019 10:59
URI: https://eprints.keele.ac.uk/id/eprint/1138

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