Cluster Difference Imaging Photometric Survey. II. TOI 837: A Young Validated Planet in IC 2602

Abstract

We report the discovery of TOI 837b and its validation as a transiting planet. We characterize the system using data from the NASA Transiting Exoplanet Survey Satellite mission, the ESA Gaia mission, ground-based photometry from El Sauce and ASTEP400, and spectroscopy from CHIRON, FEROS, and Veloce. We find that TOI 837 is a T=9.9 mag G0/F9 dwarf in the southern open cluster IC 2602. The star and planet are therefore -+ Unified Astronomy Thesaurus concepts: Exoplanets (498); Transits (1711); Exoplanet evolution (491); Stellar ages (1581); Young star clusters (1833)

TOI-2076 and TOI-1807: Two Young, Comoving Planetary Systems within 50 pc Identified by TESS that are Ideal Candidates for Further Follow Up

“…In this context, the most intriguing observations about the TOI-2076 system are the relatively large planet sizes (b, c, and d have radii of 3.2, 4.5, and 4.0 R ⊕ , respectively). All of the transiting planets detected around pre-main-sequence stars appear to have anomalously large sizes when compared to exoplanets around field stars, while planets with ages of 0.5-1Gyr appear to have sizes that are more consistent with those of the field population (see, e.g., Mann et al 2017;David et al 2019;Livingston et al 2019;Bouma et al 2020;Tofflemire et al 2021, and references therein). It remains to be seen whether this size-age correlation is astrophysical or due to lower detection efficiencies for young stars (e.g., Zhou et al 2021).…”

“…For example, the THYME survey has identified several planets in known young associations spanning a diversity of Galactic environments, such as the Tucana-Horologium and Ursa Major moving groups (Newton et al 2019;Mann et al 2020), the Scorpius-Centaurus OB association (Rizzuto et al 2020), the Pisces-Eridanus stream (Newton et al 2021), and even a previously unknown association (Tofflemire et al 2021). Other searches of TESS data have revealed planets orbiting young stars in the IC 2602 cluster (Bouma et al 2020) and in the field (Zhou et al 2021).…”

Stellar Companions to TESS Objects of Interest: A Test of Planet–Companion Alignment

“…This jitter term accounts for unknown systematic effects that may arise from factors such as the Gaia solution single-star model that fails to describe comoving binary systems. For example, TOI-837A and B have a spuriously large 3D separation of 6.6 ± 2.1 pc derived from Gaia quantities because the incorrect single-star model was assumed (Bouma et al 2020), as further discussed in Section 4.…”

A Search for Planetary Metastable Helium Absorption in the V1298 Tau System

“…It would be preferable to observe atmospheric escape in young planetary systems, as this would allow us to test our understanding of mass-loss physics during the epoch when most atmopsheric mass loss is predicted to occur. There are currently only seven confirmed young (<100 Myr) transiting planet systems: K2-33 (David et al 2016;Mann et al 2016), V1298 Tau (David et al 2019a(David et al , 2019b, DS Tuc A (Newton et al 2019), TOI 837 (Bouma et al 2020), AU Mic (Plavchan et al 2020), TOI 942 (Carleo et al 2021;Zhou et al 2021), and HIP 67522 (Rizzuto et al 2020). The expected magnitude of the outflows from these young planets depends on their gravitational potentials (e.g., Hirano et al 2020), which can be calculated using their measured masses and radii.…”