论文标题
苔丝的第一个可居住地球大小的行星。 I：TOI-700系统的验证
The First Habitable Zone Earth-sized Planet from TESS. I: Validation of the TOI-700 System
论文作者
论文摘要
我们介绍了绕附近（31.1 PC）M2 Dwarf Star TOI-700（TIC 150428135）旋转的三个行星系统的发现和验证。 TOI-700位于南方南部半球的苔丝连续观察区。跨越11个扇区的观测值揭示了三个行星，半径范围从1 r $ _ \ oplus $到2.6 r $ _ \ oplus $和轨道周期，范围从9.98到37.43天。基于地面的随访与诊断性审查和验证测试相结合，使我们能够排除常见的天体假阳性场景并验证行星系统。最外面的行星TOI-700 D的半径为$ 1.19 \ pm0.11 $ r $ _ \ oplus $，并居住在其宿主之星的保守居住区，在那里它从其恒星中获得了大约86％的地球不可分裂的速度。与其他一些低质量恒星相反，在其宜居区域中占地地球大小的行星，TOI-700表现出低水平的恒星活动，这是一个宝贵的机会，可以在影响大气逃逸的广泛条件下研究潜在的摇滚行星。虽然詹姆斯·韦伯（James Webb）太空望远镜（JWST）的大气表征将具有挑战性，但较大的子纳入toi-700 c（r = 2.63 r $ _ \ oplus $）将是JWST及以后的绝佳目标。 TESS计划返回南半球，并在其扩展任务中观察到Toi-700的另外11个部门，这应该对已知行星参数提供进一步的限制，并在系统中寻找其他行星和过境时机变化。
We present the discovery and validation of a three-planet system orbiting the nearby (31.1 pc) M2 dwarf star TOI-700 (TIC 150428135). TOI-700 lies in the TESS continuous viewing zone in the Southern Ecliptic Hemisphere; observations spanning 11 sectors reveal three planets with radii ranging from 1 R$_\oplus$ to 2.6 R$_\oplus$ and orbital periods ranging from 9.98 to 37.43 days. Ground-based follow-up combined with diagnostic vetting and validation tests enable us to rule out common astrophysical false-positive scenarios and validate the system of planets. The outermost planet, TOI-700 d, has a radius of $1.19\pm0.11$ R$_\oplus$ and resides in the conservative habitable zone of its host star, where it receives a flux from its star that is approximately 86% of the Earth's insolation. In contrast to some other low-mass stars that host Earth-sized planets in their habitable zones, TOI-700 exhibits low levels of stellar activity, presenting a valuable opportunity to study potentially-rocky planets over a wide range of conditions affecting atmospheric escape. While atmospheric characterization of TOI-700 d with the James Webb Space Telescope (JWST) will be challenging, the larger sub-Neptune, TOI-700 c (R = 2.63 R$_\oplus$), will be an excellent target for JWST and beyond. TESS is scheduled to return to the Southern Hemisphere and observe TOI-700 for an additional 11 sectors in its extended mission, which should provide further constraints on the known planet parameters and searches for additional planets and transit timing variations in the system.
