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.
The GAPS programme with HARPS-N at TNG: VI. the curious case of TrES-4b / A. Sozzetti, A.S. Bonomo, K. Biazzo, L. Mancini, M. Damasso, S. Desidera, R. Gratton, A.F. Lanza, E. Poretti, M. Rainer, L. Malavolta, L. Affer, M. Barbieri, L.R. Bedin, C. Boccato, M. Bonavita, F. Borsa, S. Ciceri, R.U. Claudi, D. Gandolfi, P. Giacobbe, T. Henning, C. Knapic, D.W. Latham, G. Lodato, A. Maggio, J. Maldonado, F. Marzari, A.F. Martinez Fiorenzano, G. Micela, E. Molinari, C. Mordasini, V. Nascimbeni, I. Pagano, M. Pedani, F. Pepe, G. Piotto, N. Santos, G. Scandariato, E. Shkolnik, J. Southworth. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 575(2015 Mar), pp. L15.1-L15.10. [10.1051/0004-6361/201425570]
The GAPS programme with HARPS-N at TNG: VI. the curious case of TrES-4b
G. Lodato;
2015
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.
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