Exploring the Dependence of Hot Jupiter Occurrence Rates on Stellar Mass with TESS

Abstract

We present estimates for the occurrence rates of hot Jupiters around dwarf stars based on data from the Transiting Exoplanet Survey Satellite (TESS) Prime Mission. We take 97 hot Jupiters orbiting 198,721 AFG dwarf stars (ranging in mass from $0.8M_{\odot}$ to $2.3M_{\odot}$) from an independent search for hot Jupiters using TESS Prime Mission data. We estimate our planet sample's false positive rates as $14\pm7\%$ for A stars, $16\pm6\%$ for F stars, and $0\%$ for G stars. We find hot Jupiter occurrence rates of $0.29 \pm 0.05\%$ for A stars, $0.36 \pm 0.06\%$ for F stars and $0.55 \pm 0.14\%$ for G stars, with a weighted average across AFG stars of $0.33\pm0.04\%$. Our results show a correlation between higher hot Jupiter abundance and lower stellar mass, and are in good agreement with occurrence rates found by Kepler. After correcting for the presence of binaries in the TESS stellar sample, we estimate a single-star hot Jupiter occurrence rate of $0.98\pm0.36\%$ for G stars. This is in agreement with results from radial velocity (RV) surveys, indicating that stellar multiplicity correction is able to resolve the discrepancy between hot Jupiter occurrence rates based on transits and RVs.