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+30 Myr) 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 v sin i∗ = 13.8 ± 0.5 km s-1, and a radius of ∼0.9 R. 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+0.376 R, and a mass upper limit of 16 M 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+0.410 R, and a mass upper limit of 37 M at 1σ confidence level.

Carleo, I., Desidera, S., Nardiello, D., Malavolta, L., Lanza, A., Livingston, J., et al. (2021). The GAPS Programme at TNG. XXVIII. A pair of hot-Neptunes orbiting the young star TOI-942. ASTRONOMY & ASTROPHYSICS, 645 [10.1051/0004-6361/202039042].

The GAPS Programme at TNG. XXVIII. A pair of hot-Neptunes orbiting the young star TOI-942

Giuseppe Frustagli
Membro del Collaboration Group
;
2021

Abstract

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+30 Myr) 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 v sin i∗ = 13.8 ± 0.5 km s-1, and a radius of ∼0.9 R. 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+0.376 R, and a mass upper limit of 16 M 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+0.410 R, and a mass upper limit of 37 M at 1σ confidence level.
Articolo in rivista - Articolo scientifico
Planetary systems; Stars: fundamental parameters; Techniques: photometric; Techniques: radial velocities; Techniques: spectroscopic;
English
15-gen-2021
2021
645
A71
none
Carleo, I., Desidera, S., Nardiello, D., Malavolta, L., Lanza, A., Livingston, J., et al. (2021). The GAPS Programme at TNG. XXVIII. A pair of hot-Neptunes orbiting the young star TOI-942. ASTRONOMY & ASTROPHYSICS, 645 [10.1051/0004-6361/202039042].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/298626
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