The GAPS programme with HARPS-N at 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.; ... (2015). The GAPS programme with HARPS-N at TNG VI. The curious case of TrES-4b. Astronomy and astrophysics, 575(L15), L15. EDP Sciences 10.1051/0004-6361/201425570

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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 ms(-1). The derived mass of TrES-4b is found to be M-p = 0.49 +/- 0.04 M-Jup, significantly lower than previously reported. Combined with the large radius (R-p = 1.84(-0.09)(+0.08) R-Jup) 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:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Mordasini, Christoph

Subjects:

500 Science > 520 Astronomy
500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Katharina Weyeneth-Moser

Date Deposited:

17 Jun 2016 13:38

Last Modified:

26 Jun 2016 02:16

Publisher DOI:

10.1051/0004-6361/201425570

Web of Science ID:

000360710400032

ArXiv ID:

1501.06403

BORIS DOI:

10.7892/boris.81946

URI:

https://boris.unibe.ch/id/eprint/81946

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