Systematic Reanalysis of KMTNet Microlensing Events. II. Two New Planets in Giant-source Events
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Date
2025-06-01
Open Access Location
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing on behalf of the American Astronomical Society.
Rights
(c) 2025 The Author/s
CC BY 4.0
CC BY 4.0
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.
Description
Keywords
Exoplanets (498), Gravitational microlensing (672), Gravitational microlensing exoplanet detection (2147), Light curves (918), Photometry (1234)
Citation
Yang H, Yee JC, Zhang J, Lee CU, Kim DJ, Bond IA, Udalski A, Hwang KH, Zang W, Qian Q, Gould A, Mao S, Albrow MD, Chung SJ, Han C, Jung YK, Ryu YH, Shin IG, Shvartzvald Y, Cha SM, Kim HW, Kim SL, Lee DJ, Lee Y, Park BG, Pogge RW, Abe F, Bando K, Bennett DP, Bhattacharya A, Fukui A, Hamada R, Hamada S, Hamasaki N, Hirao Y, Silva SI, Itow Y, Koshimoto N, Matsubara Y, Miyazaki S, Muraki Y, Nagai T, Nunota K, Olmschenk G, Ranc C, Rattenbury NJ, Satoh Y, Sumi T, Suzuki D, Terry SK, Tristram PJ, Vandorou A, Yama H, Mróz P, Skowron J, Poleski R, Szymański MK, Soszyński I, Pietrukowicz P, Kozłowski S, Ulaczyk K, Rybicki KA, Iwanek P, Wrona M. (2025). Systematic Reanalysis of KMTNet Microlensing Events. II. Two New Planets in Giant-source Events. Astronomical Journal. 169. 6.