Systematic Reanalysis of KMTNet Microlensing Events. II. Two New Planets in Giant-source Events
Abstract In this work, we continue to apply the updated KMTNet tender-love care 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 q ∼ 4 × 10 −3 and q ∼ 1 × 10 −4 , 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.
Authors
- Sang-Mok Cha (ORCID: https://orcid.org/0000-0002-7511-2950)
- Yongseok Lee (ORCID: https://orcid.org/0000-0001-7594-8072)
- I. Soszyński (ORCID: https://orcid.org/0000-0002-7777-0842)
- Michael D. Albrow (ORCID: https://orcid.org/0000-0003-3316-4012)
- Weicheng Zang (ORCID: https://orcid.org/0000-0001-6000-3463)
- Hongjing Yang (ORCID: https://orcid.org/0000-0003-0626-8465)
- Yuki Satoh (ORCID: https://orcid.org/0000-0002-1228-4122)
- Y. Itow (ORCID: https://orcid.org/0000-0002-8198-1968)
- Sean K. Terry (ORCID: https://orcid.org/0000-0002-5029-3257)
- Kyu‐Ha Hwang (ORCID: https://orcid.org/0000-0002-9241-4117)
- Akihiko Fukui (ORCID: https://orcid.org/0000-0002-4909-5763)
- Shude Mao (ORCID: https://orcid.org/0000-0001-8317-2788)
- Hibiki Yama (ORCID: https://orcid.org/0000-0001-7692-0581)
- Clément Ranc (ORCID: https://orcid.org/0000-0003-2388-4534)
- Naoto Hamasaki
- D. P. Bennett (ORCID: https://orcid.org/0000-0001-8043-8413)
- M. K. Szymański (ORCID: https://orcid.org/0000-0002-0548-8995)
- J. Skowron (ORCID: https://orcid.org/0000-0002-2335-1730)
- Byeong-Gon Park (ORCID: https://orcid.org/0000-0002-6982-7722)
- R. Poleski (ORCID: https://orcid.org/0000-0002-9245-6368)
- Yoon-Hyun Ryu (ORCID: https://orcid.org/0000-0001-9823-2907)
- Yossi Shvartzvald (ORCID: https://orcid.org/0000-0003-1525-5041)
- Seung‐Lee Kim (ORCID: https://orcid.org/0000-0003-0562-5643)
- Chung‐Uk Lee (ORCID: https://orcid.org/0000-0003-0043-3925)
- Dong-Joo Lee (ORCID: https://orcid.org/0009-0000-5737-0908)
- Aparna Bhattacharya (ORCID: https://orcid.org/0009-0004-2788-1554)
- Naoki Koshimoto (ORCID: https://orcid.org/0000-0003-2302-9562)
- Sun‐Ju Chung (ORCID: https://orcid.org/0000-0001-6285-4528)
- Cheongho Han (ORCID: https://orcid.org/0000-0002-2641-9964)
- T. Sumi (ORCID: https://orcid.org/0000-0002-4035-5012)
- Aikaterini Vandorou (ORCID: https://orcid.org/0000-0002-9881-4760)
- A. Udalski (ORCID: https://orcid.org/0000-0001-5207-5619)
- Youn Kil Jung (ORCID: https://orcid.org/0000-0002-0314-6000)
- Qiyue Qian (ORCID: https://orcid.org/0000-0003-4625-8595)
- Patryk Iwanek (ORCID: https://orcid.org/0000-0002-6212-7221)
- Shota Miyazaki (ORCID: https://orcid.org/0000-0001-9818-1513)
- Stela Ishitani Silva (ORCID: https://orcid.org/0000-0003-2267-1246)
- Jiyuan Zhang (ORCID: https://orcid.org/0000-0002-1279-0666)
- I. A. Bond (ORCID: https://orcid.org/0000-0002-8131-8891)
- P. Pietrukowicz (ORCID: https://orcid.org/0000-0002-2339-5899)
- P. Mróz (ORCID: https://orcid.org/0000-0001-7016-1692)
- K. Ulaczyk (ORCID: https://orcid.org/0000-0001-6364-408X)
- Nicholas J. Rattenbury (ORCID: https://orcid.org/0000-0001-5069-319X)
- Hyoun-Woo Kim (ORCID: https://orcid.org/0000-0001-8263-1006)
- In-Gu Shin (ORCID: https://orcid.org/0000-0002-4355-9838)
- Greg Olmschenk (ORCID: https://orcid.org/0000-0001-8472-2219)
- Yuki Hirao (ORCID: https://orcid.org/0000-0003-4776-8618)
- Jennifer C. Yee (ORCID: https://orcid.org/0000-0001-9481-7123)
- Y. Matsubara (ORCID: https://orcid.org/0000-0002-9629-4810)
- Dong-Jin Kim (ORCID: https://orcid.org/0000-0002-4292-9649)
- P. J. Tristram (ORCID: https://orcid.org/0009-0009-8289-9884)
- S. Kozłowski (ORCID: https://orcid.org/0000-0003-4084-880X)
- Richard W. Pogge (ORCID: https://orcid.org/0000-0003-1435-3053)
- Ryusei Hamada
- Marcin Wrona (ORCID: https://orcid.org/0000-0002-3051-274X)
- Y. Muraki (ORCID: https://orcid.org/0000-0003-1978-2092)
- Kansuke Nunota (ORCID: https://orcid.org/0009-0005-3414-455X)
- Tutumi Nagai
- Krzysztof A. Rybicki
- Daisuke Suzuki
- Fumio Abe
- Shunya Hamada
- Andrew Gould
- Ken Bando
Publication Details
- Journal
- The Astronomical Journal
- Published
- 2025-05-07
- DOI
- https://doi.org/10.3847/1538-3881/adc73e
- Citations
- 2
- Primary Topic
- Astro and Planetary Science
- Type
- article
- Field-Weighted Citation Impact
- 2.31
Funders
- National Science Foundation
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Korea Astronomy and Space Science Institute
- Tsinghua University
- Ministry of Science and ICT, South Korea
- Korea Research Environment Open Network
- Japan Society for the Promotion of Science