Kepler

Exoplanet Populations, Kepler, Hierarchical Bayesian models, Approximate Bayesian Computing, Machine Learning, Gaussian Process Emulators

Here we report the sizes and masses of three planets orbiting Kepler-138, a star much fainter and cooler than the Sun. We determine that the mass of the Mars-sized inner planet, Kepler-138 b, is ${0.066}_{-0.037}^{+0.059}$ Earth masses. The middle and outer planets are both slightly larger than Earth...