In:
Astronomy & Astrophysics, EDP Sciences, Vol. 645 ( 2021-1), p. A71-
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 P rot = 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 P b = 4.3263 ± 0.0011 days, a radius R b = 4.242 −0.313 +0.376 R ⊕ , and a mass upper limit of 16 M ⊕ at 1 σ confidence level. The outer planet, TOI-942 c, has an orbital period P c = 10.1605 −0.0053 +0.0056 days, a radius R c = 4.793 −0.351 +0.410 R ⊕ , and a mass upper limit of 37 M ⊕ at 1 σ confidence level.
Type of Medium:
Online Resource
ISSN:
0004-6361
,
1432-0746
DOI:
10.1051/0004-6361/202039042
Language:
English
Publisher:
EDP Sciences
Publication Date:
2021
detail.hit.zdb_id:
1458466-9
SSG:
16,12
