An Earth-mass Planet in a Time of Covid-19: KMT-2020-BLG-0414Lb

Weicheng Zang, Cheongho Han, Iona Kondo +56

We report the discovery of KMT-2020-BLG-0414Lb, with a planet-to-host mass ratio $q_2=0.9$--$1.2\times 10^{-5}=3$--$4q_{\oplus }$ at $1\sigma$, which is the lowest mass-ratio micro…