Year: 2024
Type: article
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: 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.
DOI: 10.17615/5r97-p428
Authors: Molinaro, M., Mann, A. W., Strakhov, I. A., Hesse, K. M., Mancini, L., Ziegler, C., Goeke, B., Kostov, V. B., Cosentino, R., Bignamini, A., Safonov, B. S., Scandariato, G., Naponiello, L., Lanza, A. F., Singh, V., Sozzetti, A., Pedani, M., Montalto, M., Biazzo, K., Nardiello, D., Andreuzzi, G., Bieryla, A., Bonomo, A. S., Winn, J. N., Seager, S., Nascimbeni, V., Pagano, I., Cabona, L., Fiorenzano, A., Greco, N., Mantovan, G., Fong, W., Desidera, S., Maggio, A., Zingales, T., Damasso, M., Briceño, C., Latham, D. W., Law, N.
Institution: University of North Carolina at Chapel Hill
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Aeronautics and Space Administration, California Institute of Technology, Nvidia, Space Telescope Science Institute, Dipartimenti di Eccellenza, Agenzia Spaziale Italiana, Istituto Nazionale di Astrofisica, Lomonosov Moscow State University, Ames Research Center, Science Mission Directorate
Awards: G1303340219, G5434694293
OpenAlex ID: W4404670221
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