A warm super-Neptune around the G-dwarf star TOI-1710 revealed with TESS, SOPHIE, and HARPS-N

König, P. -C.; Damasso, M.; Hébrard, G.; Naponiello, L.; Cortés-Zuleta, P.; Biazzo, K.; Santos, N. C.; Bonomo, A. S.; Lecavelier des Étangs, A.; Zeng, L.; Hoyer, S.; Sozzetti, A.; Affer, L.; Almenara, J. M.; Benatti, S.; Bieryla, A.; Boisse, I.; Bonfils, X.; Boschin, W.; Carmona, A.; Claudi, R.; Collins, K. A.; Dalal, S.; Deleuil, M.; Delfosse, X.; Demangeon, O. D. S.; Desidera, S.; Díaz, R. F.; Forveille, T.; Heidari, N.; Hussain, G. A. J.; Jenkins, J.; Kiefer, F.; Lacedelli, G.; Latham, D. W.; Malavolta, L.; Mancini, L.; Martioli, E.; Micela, G.; Miles-Páez, P. A.; Moutou, C.; Nardiello, D.; Nascimbeni, V.; Pinamonti, M.; Piotto, G.; Ricker, G.; Schwarz, R. P.; Seager, S.; Stognone, R. G.; Strøm, P. A.; Vanderspek, R.; Winn, J.; Wittrock, J.
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Astronomy and Astrophysics

Fecha de publicación:
We report the discovery and characterization of the transiting extrasolar planet TOI-1710 b. It was first identified as a promising candidate by the Transiting Exoplanet Survey Satellite. Its planetary nature was then established with SOPHIE and HARPS-N spectroscopic observations via the radial-velocity method. The stellar parameters for the host star are derived from the spectra and a joint Markov chain Monte-Carlo adjustment of the spectral energy distribution and evolutionary tracks of TOI-1710. A joint MCMC analysis of the TESS light curve and the radial-velocity evolution allows us to determine the planetary system properties. From our analysis, TOI-1710 b is found to be a massive warm super-Neptune (Mp = 28.3 ± 4.7 M⊕ and Rp = 5.34 ± 0.11 R⊕) orbiting a G5V dwarf star (Teff = 5665 ± 55 K) on a nearly circular 24.3-day orbit (e = 0.16 ± 0.08). The orbital period of this planet is close to the estimated rotation period of its host star Prot = 22.5 ± 2.0 days and it has a low Keplerian semi-amplitude K = 6.4 ± 1.0 m s−1; we thus performed additional analyses to show the robustness of the retrieved planetary parameters. With a low bulk density of 1.03 ± 0.23 g cm−3 and orbiting a bright host star (J = 8.3, V = 9.6), TOI-1710 b is one of the best targets in this mass-radius range (near the Neptunian desert) for atmospheric characterization via transmission spectroscopy, a key measurement in constraining planet formation and evolutionary models of sub-Jovian planets.