Homogeneous stellar parameters for 717,807 TESS FGK stars using Gaia DR3

TL;DR

This paper presents a large, homogeneous catalog of stellar parameters for over 700,000 TESS FGK stars, derived using Gaia DR3 data and isochrones, enabling improved exoplanet characterization.

Contribution

It provides one of the largest homogeneous stellar parameter catalogues for TESS stars, including ages, and validates these against other methods, enhancing exoplanet studies.

Findings

Median errors: 0.06 R_sun, 0.05 M_sun, 104 K, 2.1 Gyr for radius, mass, temperature, and age.

Identified 278 TESS exoplanet hosts and 915 candidates.

Recalculated planet radii using homogeneous stellar parameters.

Abstract

Precise homogeneous stellar characterisation is crucial for our understanding of the physical properties of exoplanets, their demographics and the environment from which they are formed. We present a homogeneous catalogue of 717,807 TESS FGK dwarfs and early subgiants, making use of isochrones along with Gaia DR3 inputs of photometry, parallax and spectroscopic temperature and metallicity, thus providing one of the largest homogeneous catalogues of stellar ages for TESS stars to date. We determine values for distance, $\log g$, $[\mathrm{M/H}]$, $T_{\mathrm{eff}}$, radius, mass and age. For our best fit values, we calculate absolute median errors of $0.06\,R_\odot$, $0.05\,M_\odot$,$104\,K$ and $2.1\,\mathrm{Gyr}$ on radius, mass, temperature and age respectively. We compare and validate our catalogue values to various literature sources which employ other isochrone grids and asteroseismology. In addition, we identify 278 TESS exoplanet hosts and 915 candidates and recalculate the planet radii for such systems. These homogeneous parameters provide a state-of-the art sample to probe the effect of physical stellar parameters on exoplanet characteristics and architectures.