论文标题
tng xxviii的差距程序 - 一对旋转年轻恒星TOI-942的热脉
The GAPS Programme at TNG XXVIII -- A pair of hot-Neptunes orbiting the young star TOI-942
论文作者
论文摘要
年轻的恒星和多个星光系统都是主要对象，使我们能够研究，理解和限制行星形成和进化论。 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在较大的轨道上检测系统中的其他过渡行星。从光度和光谱观测中，我们进行了详尽的恒星表征，并得出了主要的恒星参数。 TOI-942是一个相对活跃的K2.5V星（LOGR'HK = -4.17+-0.01），旋转周期prot = 3.39+-0.01天，一个投影的旋转速度vsini = 13.8+-0.5+-0.5 km/s，半径为〜0.9 rsun。我们发现内部行星TOI-942B具有轨道周期pb = 4.3263+-0.0011天，半径rb = 4.242-0.313+0.376后部后部，质量上限为16米特置信度。外行星TOI-942C的轨道周期PC = 10.1605-0.0053+0.0056天，半径rc = 4.793-0.351+0.410后部后部，质量上限为1-sigma置信度。
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.
