论文标题
苔丝狩猎年轻和成熟的系外行星（百里香）IX：27 Myr的下部库库症症，具有过境的两行星系统
TESS Hunt for Young and Maturing Exoplanets (THYME) IX: a 27 Myr extended population of Lower-Centaurus Crux with a transiting two-planet system
论文作者
论文摘要
我们报告了附近（约85个PC），年龄较大（27 +/- 3 MYR），分布式恒星种群（LCC）附近的分布式恒星种群（LCC）的发现和表征，最初是通过搜索与苔丝（HD 109833; TOI 1097; TOI 1097; TOI 1097; TOS）的候选恒星共同移动的恒星。我们使用Gaia运动学，色彩障碍信息和候选成员的旋转期确定关联成员资格。我们使用同句，旋律年代学和LI耗竭来衡量其年龄。尽管该关联接近LCC的已知种群，但我们发现它比以前发现的LCC亚组（10-16 Myr）更古老，并且位置和速度都不同。除了在HD 109833附近的候选行星外，该协会还包含四个直接成像的行星质量伴侣，约3颗星，YSES-1，YSES-2和HD 95086，所有这些伴侣以前均在年轻的LCC中分配了成员。使用Notch管道，我们在HD 109833附近确定了第二个候选候选行星。我们使用一套基于地面的后续观测值来验证两个过境信号本质上是行星。 HD 109833 B和C加入了Tess的小少数但不断增长的小于100 MYR的透过行星。 HD 109833的旋转期和LI丰度表示年轻的年龄（<100 Myr），但在新人群的郊区的位置和速度，LI水平较低，而LI水平较低，而CMD位置低于27 MYR的模型预测。因此，我们不能拒绝HD 109833是在人口附近偶然的年轻野外明星的可能性。
We report the discovery and characterization of a nearby (~ 85 pc), older (27 +/- 3 Myr), distributed stellar population near Lower-Centaurus-Crux (LCC), initially identified by searching for stars co-moving with a candidate transiting planet from TESS (HD 109833; TOI 1097). We determine the association membership using Gaia kinematics, color-magnitude information, and rotation periods of candidate members. We measure it's age using isochrones, gyrochronology, and Li depletion. While the association is near known populations of LCC, we find that it is older than any previously found LCC sub-group (10-16 Myr), and distinct in both position and velocity. In addition to the candidate planets around HD 109833 the association contains four directly-imaged planetary-mass companions around 3 stars, YSES-1, YSES-2, and HD 95086, all of which were previously assigned membership in the younger LCC. Using the Notch pipeline, we identify a second candidate transiting planet around HD 109833. We use a suite of ground-based follow-up observations to validate the two transit signals as planetary in nature. HD 109833 b and c join the small but growing population of <100 Myr transiting planets from TESS. HD 109833 has a rotation period and Li abundance indicative of a young age (< 100 Myr), but a position and velocity on the outskirts of the new population, lower Li levels than similar members, and a CMD position below model predictions for 27 Myr. So, we cannot reject the possibility that HD 109833 is a young field star coincidentally nearby the population.
