The Astronomical Journal (Jan 2025)

Systematic Reanalysis of KMTNet Microlensing Events. II. Two New Planets in Giant-source Events

  • Hongjing Yang,
  • Jennifer C. Yee,
  • Jiyuan Zhang,
  • Chung-Uk Lee,
  • Dong-Jin Kim,
  • Ian A. Bond,
  • Andrzej Udalski,
  • Kyu-Ha Hwang,
  • Weicheng Zang,
  • Qiyue Qian,
  • Andrew Gould,
  • Shude Mao,
  • (Leading Authors),
  • Michael D. Albrow,
  • Sun-Ju Chung,
  • Cheongho Han,
  • Youn Kil Jung,
  • Yoon-Hyun Ryu,
  • In-Gu Shin,
  • Yossi Shvartzvald,
  • Sang-Mok Cha,
  • Hyoun-Woo Kim,
  • Seung-Lee Kim,
  • Dong-Joo Lee,
  • Yongseok Lee,
  • Byeong-Gon Park,
  • Richard W. Pogge,
  • (The KMTNet Collaboration),
  • Fumio Abe,
  • Ken Bando,
  • David P. Bennett,
  • Aparna Bhattacharya,
  • Akihiko Fukui,
  • Ryusei Hamada,
  • Shunya Hamada,
  • Naoto Hamasaki,
  • Yuki Hirao,
  • Stela Ishitani Silva,
  • Yoshitaka Itow,
  • Naoki Koshimoto,
  • Yutaka Matsubara,
  • Shota Miyazaki,
  • Yasushi Muraki,
  • Tutumi Nagai,
  • Kansuke Nunota,
  • Greg Olmschenk,
  • Clément Ranc,
  • Nicholas J. Rattenbury,
  • Yuki Satoh,
  • Takahiro Sumi,
  • Daisuke Suzuki,
  • Sean K. Terry,
  • Paul . J. Tristram,
  • Aikaterini Vandorou,
  • Hibiki Yama,
  • (The MOA Collaboration),
  • Przemek Mróz,
  • Jan Skowron,
  • Radoslaw Poleski,
  • Michał K. Szymański,
  • Igor Soszyński,
  • Paweł Pietrukowicz,
  • Szymon Kozłowski,
  • Krzysztof Ulaczyk,
  • Krzysztof A. Rybicki,
  • Patryk Iwanek,
  • Marcin Wrona,
  • (The OGLE Collaboration)

DOI
https://doi.org/10.3847/1538-3881/adc73e
Journal volume & issue
Vol. 169, no. 6
p. 295

Abstract

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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.

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