A Search for Exoplanets in Open Clusters and Young Associations based on TESS Objects of Interest

TL;DR

This study searches for exoplanets in open clusters and young associations using TESS data, identifying confirmed planets, candidates, and brown dwarfs, and analyzing stellar properties and memberships.

Contribution

It provides the first systematic search for exoplanets in open clusters and young associations using TESS data, including new candidate identifications and stellar age estimations.

Findings

One confirmed planet and one promising candidate found in open clusters.

Ten planet candidates identified in young stellar associations.

Estimated stellar ages and rotation periods suggest some candidates are likely young planets.

Abstract

We report the results of our search of planet candidates in Open Clusters and Young Stellar Associations based on the TESS Objects of Interest Catalog. We find one confirmed planet, one promising candidate, one brown dwarf, and three unverified planet candidates in a sample of 1229 Open Clusters from the second Gaia data release. We discuss individual planet-star systems based on their basic parameters, membership probability, and the observation notes from the ExoFOP-TESS website. We also find ten planet candidates (P $>$ 95%) in Young Stellar Associations by using the BANYAN $\Sigma$ Bayesian Algorithm. Among the ten candidates, five are known planet systems. We estimate the rotation periods of the host stars using the TESS light curves and estimate their ages based on gyrochronology. Two candidates with periodic variations are likely to be young planets, but their exact memberships to Young Stellar Associations remain unknown.