The GAPS Programme with HARPS-N@TNG VI: The Curious Case of TrES-4b
Sozzetti, A. · Bonomo, A. S. · Biazzo, K. · Mancini, L. · Damasso, M. · Desidera, S. · Gratton, R. · Lanza, A. F. · Poretti, E. · Rainer, M. · Malavolta, L. · Affer, L. · Barbieri, M. · Bedin, L. R. · Boccato, C. · Bonavita, M. · Borsa, F. · Ciceri, S. · Claudi, R. U. · Gandolfi, D. · Giacobbe, P. · Henning, T. · Knapic, C. · Latham, D. W. · Lodato, G. · Maggio, A. · Maldonado, J. · Marzari, F. · Fiorenzano, A. F. Martinez · Micela, G. · Molinari, E. · Mordasini, C. · Nascimbeni, V. · Pagano, I. · Pedani, M. · Pepe, F. · Piotto, G. · Santos, N. · Scandariato, G. · Shkolnik, E. · Southworth, J.
الأصل · EN
We revisit the TrES-4 system parameters based on 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 an amplitude K=51±3 m s⁻¹. The derived mass of TrES-4b is found to be M p = 0.49±0.04 MJup, significantly lower than previously reported. Combined with the large radius (R p = 1.84₋₀.₀₉⁺⁰.⁰⁸ RJup) inferred from our analysis, TrES-4b becomes the second-lowest density transiting hot Jupiter 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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