Light curves of microlensing events revealing planets

We reanalyzed previous data from the Korea Microlensing Telescope Network survey to search for weak planetary signals in lensing events involving faint source stars. For events with potential short-term anomalies identified in the initial search, we validated the signals using rereduced data and conducted detailed modeling of the anomalous events.

This process led to the discovery of four planetary events: KMT-2017-BLG-2197, KMT-2022-BLG-1790, KMT-2022-BLG-2076, and KMT-2023-BLG-2209. For all these events, the modeling resulted in two solutions due to the well-known inner-outer degeneracy. The estimated masses of the planets and their hosts are approximately (M_p_/M_J_,M_h_/M_{sun}_)~(0.36,7.9) for KMT-2017-BLG-2197L, ~(0.6,1.7) for KMT-2022-BLG-1790L, ~(0.67,0.9) for KMT-2022-BLG-2076L, and ~(0.73,0.8) for KMT-2023-BLG-2209L.