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TESS Hunt for Young and Maturing Exoplanets (THYME) VII : Membership, rotation, and lithium in the young cluster Group-X and a new young exoplanet

Elisabeth R. NewtonRayna RampalliAdam L. Kraus ...+35 David W. Latham
Jun 2022
摘要
The public, all-sky surveys Gaia and TESS provide the ability to identify newyoung associations and determine their ages. These associations enable study ofplanetary evolution by providing new opportunities to discover youngexoplanets. A young association was recently identified by Tang et al. andF{\"u}rnkranz et al. using astrometry from Gaia (called "Group-X" by theformer). In this work, we investigate the age and membership of thisassociation; and we validate the exoplanet TOI 2048 b, which was identified totransit a young, late G dwarf in Group-X using photometry from TESS. We firstidentified new candidate members of Group-X using Gaia EDR3 data. To infer theage of the association, we measured rotation periods for candidate membersusing TESS data. The clear color--period sequence indicates that theassociation is the same age as the $300\pm50$ Myr-old NGC 3532. We obtainedoptical spectra for candidate members that show lithium absorption consistentwith this young age. Further, we serendipitously identify a new, smallassociation nearby Group-X, which we call MELANGE-2. Lastly, we statisticallyvalidate TOI 2048 b, which is $2.1\pm0.2$ \rearth\ radius planet on a 13.8-dayorbit around its 300 Myr-old host star.
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