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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.; Giacobbe, P.; Henning, T.; Knapic, C.; Latham, D.W.; Lodato, G.; Maggio, A.; Maldonado, J.; Marzari, F.; Martinez Fiorenzano, A.F.; Micela, G.; Molinari, E.; Mordasini, C.; Nascimbeni, V.; Pagano, I.; Pedani, M.; Pepe, F.; Piotto, G.; Santos, N.; Scandariato, G.; Shkolnik, E.; Southworth, J.

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Authors

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



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.

Journal Article Type Article
Acceptance Date Jan 19, 2015
Online Publication Date Mar 5, 2015
Publication Date 2015-03
Publicly Available Date Mar 29, 2024
Journal ASTRONOMY & ASTROPHYSICS
Print ISSN 0004-6361
Publisher EDP Sciences
Peer Reviewed Peer Reviewed
Volume 575
Article Number L15
DOI https://doi.org/10.1051/0004-6361/201425570
Keywords stars: individual: TrES-4b, planetary systems, techniques: radial velocities, techniques: spectroscopic, techniques: photometric
Publisher URL https://doi.org/10.1051/0004-6361/201425570

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