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
DOIAbstract
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 \ub1 3 \ub1 s-1. The derived mass of TrES-4b is found to be Mp = 0.49 \ub1 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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