학술논문
The GAPS Programme at TNG XXVIII -- A pair of hot-Neptunes orbiting the young star TOI-942
Document Type
Working Paper
Author
Carleo, Ilaria; Desidera, Silvano; Nardiello, Domenico; Malavolta, Luca; Lanza, Antonino F.; Livingston, John; Locci, Daniele; Marzari, Francesco; Messina, Sergio; Turrini, Diego; Baratella, Martina; Borsa, Francesco; D'Orazi, Valentina; Nascimbeni, Valerio; Pinamonti, Matteo; Rainer, Monica; Alei, Eleonora; Bignamini, Andrea; Gratton, Raffaele; Micela, Giuseppina; Montalto, Marco; Sozzetti, Alessandro; Squicciarini, Vito; Affer, Laura; Benatti, Serena; Biazzo, Katia; Bonomo, Aldo S.; Claudi, Riccardo; Cosentino, Rosario; Covino, Elvira; Damasso, Mario; Esposito, Massimiliano; Fiorenzano, Aldo; Frustagli, Giuseppe; Giacobbe, Paolo; Harutyunyan, Avet; Leto, Giuseppe; Magazzú, Antonio; Maggio, Antonio; Mainella, Giovanni; Maldonado, Jesus; Mallonn, Matthias; Mancini, Luigi; Molinari, Emilio; Molinaro, Marco; Pagano, Isabella; Pedani, Marco; Piotto, Giampaolo; Poretti, Ennio; Redfield, Seth; Scandariato, Gaetano
Source
A&A 645, A71 (2021)
Subject
Language
Abstract
Both young stars and multi-planet systems are primary objects that allow us to study, understand and constrain planetary formation and evolution theories. We validate the physical nature of two Neptune-type planets transiting TOI-942 (TYC 5909-319-1), a previously unacknowledged young star (50+30-20 Myr) observed by the TESS space mission in Sector 5. Thanks to a comprehensive stellar characterization, TESS light curve modelling and precise radial-velocity measurements, we validated the planetary nature of the TESS candidate and detect an additional transiting planet in the system on a larger orbit. From photometric and spectroscopic observations we performed an exhaustive stellar characterization and derived the main stellar parameters. TOI-942 is a relatively active K2.5V star (logR'hk = -4.17+-0.01) with rotation period Prot = 3.39+-0.01 days, a projected rotation velocity vsini=13.8+-0.5 km/s and a radius of ~0.9 Rsun. We found that the inner planet, TOI-942b, has an orbital period Pb=4.3263+-0.0011 days, a radius Rb=4.242-0.313+0.376 Rearth and a mass upper limit of 16 Mearth at 1-sigma confidence level. The outer planet, TOI-942c, has an orbital period Pc=10.1605-0.0053+0.0056 days, a radius Rc=4.793-0.351+0.410 Rearth and a mass upper limit of 37 Mearth at 1-sigma confidence level.