Mass Production of 2021 KMTNet Microlensing Planets. I

Abstract We inaugurate a program of “mass production” microlensing planets discovered in 2021 KMTNet data, with the aim laying basis for future statistical studies. While we ultimately plan to quickly publish all meeting some minimal criteria, current sample four was chosen simply on having low initial estimates planet–host mass ratio, q . It is therefore notable that two members this suffer from degeneracy normalized source radius ρ arises different morphologies closely spaced caustics. All (KMT-2021-BLG-1391, KMT-2021-BLG-1253, KMT-2021-BLG-1372, KMT-2021-BLG-0748) have well-characterized ratios, , and are suitable mass-ratio frequency Both degeneracies can be resolved by adaptive optics (AO) observations 30 m class telescopes. provide general guidance such AO events anticipation prospect they will revolutionize field planets.