Astronomy & Telescopes

Using Photometrically-Derived Properties of Young Stars to Refine TESS’s Transiting Young Planet Survey Completeness

By Keith Cowing
Status Report
August 27, 2023
Filed under , , , ,
Using Photometrically-Derived Properties of Young Stars to Refine TESS’s Transiting Young Planet Survey Completeness
Comparison between spectroscopically derived Teff from GALAH, APOGEE, and LAMOST to our photometrically derived Teff values for both main sequence fitting (left) and pre-main sequence fitting (right). For each survey, we list the number of targets and the median spectroscopic Teff uncertainty in parentheses. — astro-ph.SR

The demographics of young exoplanets can shed light onto their formation and evolution processes. Exoplanet properties are derived from the properties of their host stars.

As such, it is important to accurately characterize the host stars since any systematic biases in their derivation can negatively impact the derivation of planetary properties. Here, we present a uniform catalog of photometrically-derived stellar effective temperatures, luminosities, radii, and masses for 4,865 young (<1 Gyr) stars in 31 nearby clusters and moving groups within 200 pc.

We compared our photometrically-derived properties to a subset of those derived from spectra, and found them to be in good agreement. We also investigated the effect of stellar properties on the detection efficiency of transiting short-period young planets with TESS as calculated in Fernandes et al. 2022, and found an overall increase in the detection efficiency when the new photometrically derived properties were taken into account.

Most notably, there is a 1.5 times increase in the detection efficiencies for sub-Neptunes/Neptunes (1.8-6 Re) implying that, for our sample of young stars, better characterization of host star properties can lead to the recovery of more small transiting planets. Our homogeneously derived catalog of updated stellar properties, along with a larger unbiased stellar sample and more detections of young planets, will be a crucial input to the accurate estimation of the occurrence rates of young short-period planets.

Rachel B. Fernandes, Kevin K. Hardegree-Ullman, Ilaria Pascucci, Galen J. Bergsten, Gijs D. Mulders, Katia Cunha, Eric E. Mamajek, Kyle A. Pearson, Gregory A. Feiden, Jason L. Curtis

Comments: 16 pages, 5 Figures, 3 Tables. Revised and resubmitted to AJ after a favorable referee report. Co-First Authors
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2308.13039 [astro-ph.EP] (or arXiv:2308.13039v1 [astro-ph.EP] for this version)
Submission history
From: Rachel Fernandes
[v1] Thu, 24 Aug 2023 19:09:24 UTC (4,673 KB)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) πŸ––πŸ»