论文标题
苔丝狩猎年轻和成熟的系外行星（百里香）VII：年轻群集X中的成员，旋转和锂和锂X和锂
TESS Hunt for Young and Maturing Exoplanets (THYME) VII : Membership, rotation, and lithium in the young cluster Group-X and a new young exoplanet
论文作者
论文摘要
公众全天候的调查盖亚（Gaia）和苔丝（Tess）提供了识别新的年轻协会并确定年龄的能力。这些协会通过提供新的机会来发现年轻的系外行星，从而实现了行星进化的研究。 Tang等人最近确定了年轻的关联。和f {ü} rnkranz等。使用盖亚（Gaia）的天文学（前者称为“ group-x”）。在这项工作中，我们调查了该协会的年龄和成员；我们验证了系外行星TOI 2048 B，该b使用苔丝的光度法确定可以在组-X中经过年轻的g矮人。我们首先使用GAIA EDR3数据确定了Group-X的新候选成员。为了推断关联的年龄，我们使用苔丝数据测量了候选成员的旋转周期。清晰的颜色 - 周期序列表明，该关联与$ 300 \ pm50 $ Myr over NGC 3532的年龄相同。我们为候选成员获得了光谱，这些候选成员显示出与这个年龄相一致的锂吸收。此外，我们偶然地确定了附近X组的新的小型协会，我们称之为Melange-2。最后，我们从统计上验证了TOI 2048 B，这是$ 2.6 \ pm0.2 $ \ histth \ Radius \ Radius Planet，在其300 Myr Old Old Host Star附近的13.8天轨道上。
The public, all-sky surveys Gaia and TESS provide the ability to identify new young associations and determine their ages. These associations enable study of planetary evolution by providing new opportunities to discover young exoplanets. A young association was recently identified by Tang et al. and F{ü}rnkranz et al. using astrometry from Gaia (called "Group-X" by the former). In this work, we investigate the age and membership of this association; and we validate the exoplanet TOI 2048 b, which was identified to transit a young, late G dwarf in Group-X using photometry from TESS. We first identified new candidate members of Group-X using Gaia EDR3 data. To infer the age of the association, we measured rotation periods for candidate members using TESS data. The clear color--period sequence indicates that the association is the same age as the $300\pm50$ Myr-old NGC 3532. We obtained optical spectra for candidate members that show lithium absorption consistent with this young age. Further, we serendipitously identify a new, small association nearby Group-X, which we call MELANGE-2. Lastly, we statistically validate TOI 2048 b, which is $2.6\pm0.2$ \rearth\ radius planet on a 13.8-day orbit around its 300 Myr-old host star.
