Age estimations of low-mass TESS CVZ stars

With ~30 known potentially habitable planets and an ever-growing number of candidate and confirmed planets, a robust statistical framework for prioritizing characterization of these planets is desirable. Using the ~2Gyr it took life on Earth to make a detectable impact on the atmosphere as a benchmark, we use a Bayesian statistical method to determine the probability that a given radius around a star has been continuously habitable for 2Gyr.

We perform this analysis on nine potentially habitable exoplanets with planetary radii <1.8R_{Earth}_ and/or planetary masses <10M_{Earth}_ around nine low-mass host stars (~0.5-1.1M_{sun}_) with measured stellar mass and metallicity, as well as Venus, Earth, and Mars. Ages for the host stars are generated by the analysis. The technique is also used to provide age estimates for 2768 low-mass stars (0.5-1.3M_{sun}_) in the TESS Continuous Viewing Zones.