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2021A&A...645A..71C - Astronomy and Astrophysics, volume 645A71-71 (2021/1-1)
The GAPS Programme at TNG. XXVIII. A pair of hot-Neptunes orbiting the young star TOI-942.
CARLEO I., DESIDERA S., NARDIELLO D., MALAVOLTA L., LANZA A.F., LIVINGSTON J., LOCCI D., MARZARI F., MESSINA S., TURRINI D., BARATELLA M., BORSA F., D'ORAZI V., NASCIMBENI V., PINAMONTI M., RAINER M., ALEI E., BIGNAMINI A., GRATTON R., MICELA G., MONTALTO M., SOZZETTI A., SQUICCIARINI V., AFFER L., BENATTI S., BIAZZO K., BONOMO A.S., CLAUDI R., COSENTINO R., COVINO E., DAMASSO M., ESPOSITO M., FIORENZANO A., FRUSTAGLI G., GIACOBBE P., HARUTYUNYAN A., LETO G., MAGAZZU A., MAGGIO A., MAINELLA G., MALDONADO J., MALLONN M., MANCINI L., MOLINARI E., MOLINARO M., PAGANO I., PEDANI M., PIOTTO G., PORETTI E., REDFIELD S. and SCANDARIATO G.
Abstract (from CDS):
Context. Young stars and multi-planet systems are two types of primary objects that allow us to study, understand, and constrain planetary formation and evolution theories.
Aims. We validate the physical nature of two Neptune-sized planets transiting TOI-942 (TYC 5909-319-1), a previously unacknowledged young star (50–20^+30Myr) observed by the TESS space mission in Sector 5.
Methods. Thanks to a comprehensive stellar characterization, TESS light curve modeling and precise radial-velocity measurements, we validated the planetary nature of the TESS candidate and detected an additional transiting planet in the system on a larger orbit.
Results. 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 (log R'HK=-4.17±0.01) with rotation period Prot=3.39±0.01 days, a projected rotation velocity vsini*=13.8±0.5km/s, and a radius of ∼0.9R☉. We found that the inner planet, TOI-942 b, has an orbital period Pb=4.3263±0.0011 days, a radius Rb=4.242–0.313+0.376R⊕, and a mass upper limit of 16M⊕ at 1σ confidence level. The outer planet, TOI-942 c, has an orbital period Pc=10.1605–0.0053+0.0056-days, a radius Rc=4.793–0.351+0.410R⊕, and a mass upper limit of 37M⊕ at 1σ confidence level.
Abstract Copyright: © ESO 2021
Journal keyword(s): planetary systems - techniques: photometric - techniques: spectroscopic - stars: fundamental parameters - techniques: radial velocities
Simbad objects: 33
