Systematic Reanalysis of KMTNet Microlensing Events, Paper II: Two New Planets in Giant-Source Events
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2025
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| author | Yang, Hongjing Yee, Jennifer C. Zhang, Jiyuan Lee, Chung-Uk Kim, Dong-Jin Bond, Ian A. Udalski, Andrzej Hwang, Kyu-Ha Zang, Weicheng Qian, Qiyue Gould, Andrew Mao, Shude Albrow, Michael D. Chung, Sun-Ju Han, Cheongho Jung, Youn Kil Ryu, Yoon-Hyun Shin, In-Gu Shvartzvald, Yossi Cha, Sang-Mok Kim, Hyoun-Woo Kim, Seung-Lee Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. Abe, Fumio Bando, Ken Bennett, David P. Bhattacharya, Aparna Fukui, Akihiko Hamada, Ryusei Hamada, Shunya Hamasaki, Naoto Hirao, Yuki Silva, Stela Ishitani Itow, Yoshitaka Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Terry, Sean K. Tristram, Paul . J. Vandorou, Aikaterini Yama, Hibiki Mróz, Przemek Skowron, Jan Poleski, Radoslaw Szymański, Michał K. Soszyński, Igor Pietrukowicz, Paweł Kozłowski, Szymon Ulaczyk, Krzysztof Rybicki, Krzysztof A. Iwanek, Patryk Wrona, Marcin |
| author_facet | Yang, Hongjing Yee, Jennifer C. Zhang, Jiyuan Lee, Chung-Uk Kim, Dong-Jin Bond, Ian A. Udalski, Andrzej Hwang, Kyu-Ha Zang, Weicheng Qian, Qiyue Gould, Andrew Mao, Shude Albrow, Michael D. Chung, Sun-Ju Han, Cheongho Jung, Youn Kil Ryu, Yoon-Hyun Shin, In-Gu Shvartzvald, Yossi Cha, Sang-Mok Kim, Hyoun-Woo Kim, Seung-Lee Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. Abe, Fumio Bando, Ken Bennett, David P. Bhattacharya, Aparna Fukui, Akihiko Hamada, Ryusei Hamada, Shunya Hamasaki, Naoto Hirao, Yuki Silva, Stela Ishitani Itow, Yoshitaka Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Terry, Sean K. Tristram, Paul . J. Vandorou, Aikaterini Yama, Hibiki Mróz, Przemek Skowron, Jan Poleski, Radoslaw Szymański, Michał K. Soszyński, Igor Pietrukowicz, Paweł Kozłowski, Szymon Ulaczyk, Krzysztof Rybicki, Krzysztof A. Iwanek, Patryk Wrona, Marcin |
| contents | 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 $q\sim4\times10^{-3}$ and $q\sim1\times10^{-4}$, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_19471 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Systematic Reanalysis of KMTNet Microlensing Events, Paper II: Two New Planets in Giant-Source Events Yang, Hongjing Yee, Jennifer C. Zhang, Jiyuan Lee, Chung-Uk Kim, Dong-Jin Bond, Ian A. Udalski, Andrzej Hwang, Kyu-Ha Zang, Weicheng Qian, Qiyue Gould, Andrew Mao, Shude Albrow, Michael D. Chung, Sun-Ju Han, Cheongho Jung, Youn Kil Ryu, Yoon-Hyun Shin, In-Gu Shvartzvald, Yossi Cha, Sang-Mok Kim, Hyoun-Woo Kim, Seung-Lee Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. Abe, Fumio Bando, Ken Bennett, David P. Bhattacharya, Aparna Fukui, Akihiko Hamada, Ryusei Hamada, Shunya Hamasaki, Naoto Hirao, Yuki Silva, Stela Ishitani Itow, Yoshitaka Koshimoto, Naoki Matsubara, Yutaka Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Terry, Sean K. Tristram, Paul . J. Vandorou, Aikaterini Yama, Hibiki Mróz, Przemek Skowron, Jan Poleski, Radoslaw Szymański, Michał K. Soszyński, Igor Pietrukowicz, Paweł Kozłowski, Szymon Ulaczyk, Krzysztof Rybicki, Krzysztof A. Iwanek, Patryk Wrona, Marcin Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics 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 $q\sim4\times10^{-3}$ and $q\sim1\times10^{-4}$, 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. |
| title | Systematic Reanalysis of KMTNet Microlensing Events, Paper II: Two New Planets in Giant-Source Events |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2503.19471 |