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. GandolfiP. 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

Research output: Contribution to journalArticle

10 Scopus citations


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.

Original languageEnglish (US)
Article numberL15
JournalAstronomy and Astrophysics
StatePublished - Mar 2015
Externally publishedYes


  • Planetary systems
  • Stars: individual: TrES-4b
  • Techniques: photometric
  • Techniques: radial velocities
  • Techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'The GAPS programme with HARPS-N at TNG: VI. The curious case of TrES-4b'. Together they form a unique fingerprint.

  • Cite this

    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., ... Southworth, J. (2015). The GAPS programme with HARPS-N at TNG: VI. The curious case of TrES-4b. Astronomy and Astrophysics, 575, [L15].