The GAPS programme at TNG
Aims . We report the confirmation of a new transiting exoplanet orbiting the star TOI-5076. Methods . We present our vetting procedure and follow-up observations which led to the confirmation of the exoplanet TOI-5076b. In particular, we employed high-precision TESS photometry, high-angular-resolution imaging from several telescopes, and high-precision radial velocities from HARPS-N. Results . From the HARPS-N spectroscopy, we determined the spectroscopic parameters of the host star: T eff = (5070±143) K, log 𝑔 = (4.6±0.3), [Fe/H] = (+0.20±0.08), and [ α /Fe] = 0.05±0.06. The transiting planet is a warm sub-Neptune with a mass m p = (16±2) M ⊙ , a radius r p =(3.2±0.l) R ⊙ yielding a density ρ p = (2.8±0.5) g cm −3 . It revolves around its star approximately every 23.445 days. Conclusions . The host star is a metal-rich, K2V dwarf, located at about 82 pc from the Sun with a radius of R ⋆ = (0.78±0.01) R ⊙ and a mass of M ⋆ = (0.80±0.07) M ⊙ . It forms a common proper motion pair with an M-dwarf companion star located at a projected separation of 2178 au. The chemical analysis of the host-star and the Galactic-space velocities indicate that TOI-5076 belongs to the old population of thin-to-thick-disk transition stars. The density of TOI-5076b suggests the presence of a large fraction by volume of volatiles overlying a massive core. We found that a circular orbit solution is marginally favored with respect to an eccentric orbit solution for TOI-5076b.
Authors
- A. S. Bonomo (ORCID: https://orcid.org/0000-0002-6177-198X)
- L. Cabona (ORCID: https://orcid.org/0000-0002-5130-4827)
- V.B. Kostov
- Andrew W. Mann (ORCID: https://orcid.org/0000-0003-3654-1602)
- S. Desidera (ORCID: https://orcid.org/0000-0001-8613-2589)
- V. Nascimbeni (ORCID: https://orcid.org/0000-0001-9770-1214)
- Ivan A. Strakhov (ORCID: https://orcid.org/0000-0003-0647-6133)
- Katharine Hesse (ORCID: https://orcid.org/0000-0002-2135-9018)
- David W. Latham (ORCID: https://orcid.org/0000-0001-9911-7388)
- A. Maggio (ORCID: https://orcid.org/0000-0001-5154-6108)
- A. F. Lanza (ORCID: https://orcid.org/0000-0001-5928-7251)
- B. Goeke
- W. Fong (ORCID: https://orcid.org/0000-0003-0241-2757)
- T. Zingales (ORCID: https://orcid.org/0000-0001-6880-5356)
- Alessandro Sozzetti (ORCID: https://orcid.org/0000-0002-7504-365X)
- M. Damasso (ORCID: https://orcid.org/0000-0001-9984-4278)
- K. Biazzo (ORCID: https://orcid.org/0000-0002-1892-2180)
- Sara Seager (ORCID: https://orcid.org/0000-0002-6892-6948)
- Luca Naponiello (ORCID: https://orcid.org/0000-0001-9390-0988)
- C. Briceño
- M. Molinaro
- G. Mantovan (ORCID: https://orcid.org/0000-0002-6871-6131)
- G. Scandariato (ORCID: https://orcid.org/0000-0003-2029-0626)
- G. Andreuzzi (ORCID: https://orcid.org/0000-0001-5125-6397)
- C. Ziegler
- R. Cosentino (ORCID: https://orcid.org/0000-0003-1784-1431)
- D. Nardiello (ORCID: https://orcid.org/0000-0003-1149-3659)
- M. Pedani
- A. Martinez Fiorenzano
- N. Law
- J. N. Winn
- M. Montalto (ORCID: https://orcid.org/0000-0002-7618-8308)
- A. Bignamini (ORCID: https://orcid.org/0000-0002-5606-6354)
- B. S. Safonov
- Luigi Mancini (ORCID: https://orcid.org/0000-0002-9428-8732)
- Allyson Bieryla (ORCID: https://orcid.org/0000-0001-6637-5401)
- N. Greco (ORCID: https://orcid.org/0000-0003-1362-8713)
- V. Singh (ORCID: https://orcid.org/0000-0002-7485-6309)
- I. Pagano (ORCID: https://orcid.org/0000-0001-9573-4928)
Institutions
- University of North Carolina at Chapel Hill (US)
Publication Details
- Journal
- UNC Libraries
- Published
- 2024-11-20
- DOI
- https://doi.org/10.17615/5r97-p428
- Primary Topic
- Stellar, planetary, and galactic studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Aeronautics and Space Administration
- California Institute of Technology
- Nvidia
- Space Telescope Science Institute
- Dipartimenti di Eccellenza
- Istituto Nazionale di Astrofisica
- Lomonosov Moscow State University
- Ames Research Center
- Science Mission Directorate