Systematic KMTNet Planetary Anomaly Search. II. Six New q < 2 x 10(-4) Mass-ratio Planets

We apply the automated AnomalyFinder algorithm of Paper I to 2018-2019 light curves from the similar or equal to 13 deg(2) covered by the six KMTNet prime fields, with cadences Gamma >= 2 hr(-1). We find a total of 11 planets with mass ratios q < 2 x 10(-4), including 6 newly discovered planets, 1 planet that was reported in Paper I, and recovery of 4 previously discovered planets. One of the new planets, OGLE-2018-BLG-0977Lb, is in a planetary caustic event, while the other five (OGLE-2018-BLG-0506Lb, OGLE-2018-BLG-0516Lb, OGLE-2019-BLG-1492Lb, KMT-2019-BLG-0253, and KMT-2019-BLG-0953) are revealed by a "dip" in the light curve as the source crosses the host-planet axis on the opposite side of the planet. These subtle signals were missed in previous by-eye searches. The planet-host separations (scaled to the Einstein radius), s, and planet-host mass ratios, q, are, respectively, (s, q x 10(5)) = (0.88, 4.1), (0.96 +/- 0.10, 8.3), (0.94 +/- 0.07, 13), (0.97 +/- 0.07, 18), (0.97 +/- 0.04, 4.1), and (0.74, 18), where the " +/- " indicates a discrete degeneracy. The 11 planets are spread out over the range -5更多