The GAPS Programme at TNG. TOI-5076b: a warm sub-Neptune planet orbiting a thick disk star in a wide binary system.
- 1INAF - Osservatorio Astrofisico di Catania, Via Santa Sofia 78, I95123 Catania, Italy (nino.greco@inaf.it)
- 2Dipartimento di Fisica e Astronomia "Ettore Majorana", Università di Catania, Via S. Sofia 64, I-95123 Catania, Italy
- 3Scuola Superiore di Catania, Università di Catania, Via Valdisavoia 9, I-95123 Catania, Italy
- *A full list of authors appears at the end of the abstract
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: Teff=(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 mp=(16±2) M⊕, a radius rp=(3.2±0.1) R⊕ yielding a density ρp=(2.8±0.5) g cm−3. It revolves around its star 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 a 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 thick disk stars or thin-to-thick 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 only marginally favoured with respect to an eccentric orbit solution for TOI-5076b. The best-fit eccentricity for the system is e=(0.20±0.09).
N. Greco (1,2,3), M. Montalto (1), K. Biazzo (11), S. Desidera (10), G. Andreuzzi (17,11), A. Bieryla (23,24), A. Bignamini (16), A. S. Bonomo (5), C. Briceño (7), L. Cabona (10), R. Cosentino (17), M. Damasso (5), A. Fiorenzano (17), W. Fong (21), B. Goeke (21), K. M. Hesse (21), V. B. Kostov (25), A. F. Lanza (1), N. Law (8), L. Mancini (4,5,12,13), A. Maggio (18), M. Molinaro (16), A. W. Mann (8), G. Mantovan (14), L. Naponiello (4,5), D. Nardiello (10,15), V. Nascimbeni (10), I. Pagano (1), B. S. Safonov (9), G. Scandariato (1), S. Seager (20,21,22), A. Sozzetti (5), I. A. Strakhov (9), J. N. Winn (19), C. Ziegler (6), T. Zingales (14,10) --------------- |1 INAF - Osservatorio Astrofisico di Catania, Via Santa Sofia 78, I95123 Catania, Italy |2 Dipartimento di Fisica e Astronomia "Ettore Majorana", Università di Catania, Via S. Sofia 64, I-95123 Catania, Italy |3 Scuola Superiore di Catania, Università di Catania, Via Valdisavoia 9, I-95123 Catania, Italy |4 Department of Physics, University of Rome “Tor Vergata”, Via della Ricerca Scientifica 1, 00133, Rome, Italy |5 INAF - Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025 Pino Torinese, Italy |6 Department of Physics, Engineering and Astronomy, Stephen F. Austin State University, 1936 North St, Nacogdoches, TX 75962, USA |7 Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile |8 Department of Physics and Astronomy, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255, USA |9 Sternberg Astronomical Institute of Lomonosov Moscow State University, Moscow, 119234 Russia |10 INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy |11 INAF – Osservatorio Astronomico di Roma, Via Frascati 33, 00040 Monte Porzio Catone (RM), Italy |12 Max Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany |13 International Institute for Advanced Scientific Studies (IIASS), Via G. Pellegrino 19, I-84019 Vietri sul Mare (SA), Italy |14 Dipartimento di Fisica e Astronomia “Galileo Galilei”, Università degli Studi di Padova, Vicolo dell’Osservatorio 3, 35122 Padova, Italy |15 Aix Marseille Univ, CNRS, CNES, LAM, France |16 INAF – Osservatorio Astronomico di Trieste, via Tiepolo 11, 34143 Trieste |17 Fundación Galileo Galilei–INAF, Rambla José Ana Fernandez Pérez 7, 38712, Breña Baja, TF, Spain |18 INAF - Osservatorio Astronomico di Palermo "G.S. Vaiana", Piazza del Parlamento 1, 90134 Palermo, Italy |19 Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA |20 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. |21 Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA |22 Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. |23 Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA |24 University of Southern Queensland, Centre for Astrophysics, West Street, Toowoomba, QLD 4350 Australia |25 NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
How to cite: Greco, N. and Montalto, M. and the The GAPS Programme at TNG: TOI-5076b.: The GAPS Programme at TNG. TOI-5076b: a warm sub-Neptune planet orbiting a thick disk star in a wide binary system., EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-6296, https://doi.org/10.5194/egusphere-egu24-6296, 2024.
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