论文标题
发呆：苔丝露出旋转快速旋转器TOI-778的热木星
Spinning up a Daze: TESS Uncovers a Hot Jupiter orbiting the Rapid-Rotator TOI-778
论文作者
论文摘要
美国宇航局（NASA）的过境系外行星调查卫星（TESS）任务一直在发现越来越多的外部球星绕着附近的明亮恒星。大多数由苔丝轨道狭窄的，缓慢旋转的星星发现的大多数系外行星，促进了这些世界的确认和大规模确定。我们提出了绕迅速旋转的热木星的发现（$ v \ sin {（i）} = 35.1 \ pm1.0 $ km/s）早期的F3V-DWARF，HD115447（TOI-778）。从苔丝对系外行星的初始检测的扇区10和37采集的过境信号与后续的地面光度法和速度测量结果结合使用，从密涅瓦·澳大利亚（Minerva-Australis），TRES，Coralie和Chiron确认和表征TOI-778B。 TOI-778B的光曲线和径向速度测量值的联合分析产生质量，半径和轨道周期为$ 2.76^{+0.24} _ { - 0.23} $ MJUP，$ 1.370 \ $ 1.370 \ pm0.043 $ rjup和$ \ sim4.63 $ $ \ sim4.63 $。行星绕着明亮的（$ v = 9.1 $ mag）F3 warf，$ m = 1.40 \ pm0.05 $ msun，$ r = 1.70 \ pm0.05 $ rsun和$ \ log g = 4.05 \ pm0.17 $。我们观察到了TOI-778B的光谱传输，这使我们得出了$ 18^{\ circ} \ pm11^{\ circ} $的天空旋转角度角度，与一个偏向的行星系统一致。这一发现证明了较小的孔径望远镜（例如Minerva-Australis）的能力，可以检测由行星绕着宽线，快速旋转的星星绕的行星产生的径向速度信号。
NASA's Transiting Exoplanet Survey Satellite (TESS) mission, has been uncovering a growing number of exoplanets orbiting nearby, bright stars. Most exoplanets that have been discovered by TESS orbit narrow-line, slow-rotating stars, facilitating the confirmation and mass determination of these worlds. We present the discovery of a hot Jupiter orbiting a rapidly rotating ($v\sin{(i)}= 35.1\pm1.0$km/s) early F3V-dwarf, HD115447 (TOI-778). The transit signal taken from Sectors 10 and 37 of TESS's initial detection of the exoplanet is combined with follow-up ground-based photometry and velocity measurements taken from Minerva-Australis, TRES, CORALIE and CHIRON to confirm and characterise TOI-778b. A joint analysis of the light curves and the radial velocity measurements yield a mass, radius, and orbital period for TOI-778b of $2.76^{+0.24}_{-0.23}$Mjup, $1.370\pm0.043$Rjup and $\sim4.63$ days, respectively. The planet orbits a bright ($V = 9.1$mag) F3-dwarf with $M=1.40\pm0.05$Msun, $R=1.70\pm0.05$Rsun, and $\log g=4.05\pm0.17$. We observed a spectroscopic transit of TOI-778b, which allowed us to derive a sky-projected spin-orbit angle of $18^{\circ}\pm11^{\circ}$, consistent with an aligned planetary system. This discovery demonstrates the capability of smaller aperture telescopes such as Minerva-Australis to detect the radial velocity signals produced by planets orbiting broad-line, rapidly rotating stars.
