Systematic Reanalysis of KMTNet Microlensing Events, Paper II: Two New Planets in Giant-Source Events
Abstract
In this work, we continue to apply the updated KMTNet tender-love care (TLC) photometric pipeline to historical microlensing events. We apply the pipeline to a subsample of events from the KMTNet database, which we refer to as the giant source sample. Leveraging the improved photometric data, we conduct a systematic search for anomalies within this sample. The search successfully uncovers four new planet-like anomalies and recovers two previously known planetary signals. After detailed analysis, two of the newly discovered anomalies are confirmed as clear planets: KMT-2019-BLG-0578 and KMT-2021-BLG-0736. Their planet-to-host mass ratios are and , respectively. Another event, OGLE-2018-BLG-0421 (KMT-2018-BLG-0831), remains ambiguous. Both a stellar companion and a giant planet in the lens system could potentially explain the observed anomaly. The anomaly signal of the last event, MOA-2022-BLG-038 (KMT-2022-BLG-2342), is attributed to an extra source star. Within this sample, our procedure doubles the number of confirmed planets, demonstrating a significant enhancement in the survey sensitivity.
Keywords
Cite
@article{arxiv.2503.19471,
title = {Systematic Reanalysis of KMTNet Microlensing Events, Paper II: Two New Planets in Giant-Source Events},
author = {Hongjing Yang and Jennifer C. Yee and Jiyuan Zhang and Chung-Uk Lee and Dong-Jin Kim and Ian A. Bond and Andrzej Udalski and Kyu-Ha Hwang and Weicheng Zang and Qiyue Qian and Andrew Gould and Shude Mao and Michael D. Albrow and Sun-Ju Chung and Cheongho Han and Youn Kil Jung and Yoon-Hyun Ryu and In-Gu Shin and Yossi Shvartzvald and Sang-Mok Cha and Hyoun-Woo Kim and Seung-Lee Kim and Dong-Joo Lee and Yongseok Lee and Byeong-Gon Park and Richard W. Pogge and Fumio Abe and Ken Bando and David P. Bennett and Aparna Bhattacharya and Akihiko Fukui and Ryusei Hamada and Shunya Hamada and Naoto Hamasaki and Yuki Hirao and Stela Ishitani Silva and Yoshitaka Itow and Naoki Koshimoto and Yutaka Matsubara and Shota Miyazaki and Yasushi Muraki and Tutumi Nagai and Kansuke Nunota and Greg Olmschenk and Clément Ranc and Nicholas J. Rattenbury and Yuki Satoh and Takahiro Sumi and Daisuke Suzuki and Sean K. Terry and Paul . J. Tristram and Aikaterini Vandorou and Hibiki Yama and Przemek Mróz and Jan Skowron and Radoslaw Poleski and Michał K. Szymański and Igor Soszyński and Paweł Pietrukowicz and Szymon Kozłowski and Krzysztof Ulaczyk and Krzysztof A. Rybicki and Patryk Iwanek and Marcin Wrona},
journal= {arXiv preprint arXiv:2503.19471},
year = {2025}
}
Comments
Author's edition. Accepted for publication in The Astronomical Journal