The GAPS programme at TNG LVII. TOI-5076b: A warm sub-Neptune planet orbiting a thin-to-thick-disk transition star in a wide binary system
Article
Article Title | The GAPS programme at TNG LVII. TOI-5076b: A warm sub-Neptune planet orbiting a thin-to-thick-disk transition star in a wide binary system |
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ERA Journal ID | 1050 |
Article Category | Article |
Authors | Montalto, M., Greco, N., Biazzo, K., Desidera, S., Andreuzzi, G., Bieryla, A., Bignamini, A., Bonomo, A.S, Briceno, C., Cabona, L., Cosentino, R., Damasso, M., Fiorenzano, A., Fong, W., Goeke, B., Hesse, K. M., Kostov, V. B., Lanza, A. F., Latham, D. W., Law, N., Mancini, L., Maggio, A., Molinaro, M., Mann, A. W., Mantovan, G., Naponiello, L., Nardiello, D., Nascimbeni, V., Pagano, I., Pedani, M., Safonov, B., Scandariato, G., Seager, S., Singh, V., Sozzetti, A., Strakhov, I., Winn, J., Ziegler, C. and Zingales, T. |
Journal Title | Astronomy and Astrophysics: a European journal |
Journal Citation | 687 |
Article Number | A226 |
Number of Pages | 15 |
Year | 2024 |
Publisher | EDP Sciences |
Place of Publication | France |
ISSN | 0004-6361 |
1432-0746 | |
Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/202349082 |
Web Address (URL) | https://www.aanda.org/articles/aa/full_html/2024/07/aa49082-23/aa49082-23.html |
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.l) R⊙ yielding a density ρp = (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. |
Keywords | techniques: photometric; techniques: radial velocities; planets and satellites: gaseous planets; binaries: visual; planets and satellites: general ; planets and satellites: oceans |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | INAF - Catania Astrophysical Observatory, Italy |
INAF - Astronomical Observatory of Rome, Italy | |
INAF - Astronomical Observatory of Padova, Italy | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Centre for Astrophysics | |
INAF - Trieste Astronomical Observatory, Italy | |
INAF - Astrophysical Observatory of Turin, Italy | |
Cerro Tololo Inter-American Observatory, Chile | |
Galileo Galilei Foundation - INAF, Spain | |
Massachusetts Institute of Technology, United States | |
NASA Goddard Space Flight Center, United States | |
University of North Carolina at Chapel Hill, United States | |
INAF - Palermo Astronomical Observatory, Italy | |
University of Padua, Italy | |
University of Rome Tor Vergata, Italy | |
Lomonosov Moscow State University, Russia | |
Princeton University, United States | |
Stephen F. Austin State University, United States |
https://research.usq.edu.au/item/z993y/the-gaps-programme-at-tng-lvii-toi-5076b-a-warm-sub-neptune-planet-orbiting-a-thin-to-thick-disk-transition-star-in-a-wide-binary-system
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