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arXiv · 2311.04876

Systematic Reanalysis of KMTNet microlensing events, Paper I: Updates of the Photometry Pipeline and a New Planet Candidate

Hongjing Yang·Jennifer C. Yee·Kyu-Ha Hwang·Qiyue Qian·Ian A. Bond·Andrew Gould·Zhecheng Hu·Jiyuan Zhang·Shude Mao·Wei Zhu·Michael D. Albrow·Sun-Ju Chung·Cheongho Han·Youn Kil Jung·Yoon-Hyun Ryu·In-Gu Shin·Yossi Shvartzvald·Sang-Mok Cha·Dong-Jin Kim·Hyoun-Woo Kim·Seung-Lee Kim·Chung-Uk Lee·Dong-Joo Lee·Yongseok Lee·Byeong-Gon Park·Richard W. Pogge·Weicheng Zang·Fumio Abe·Richard Barry·David P. Bennett·Aparna Bhattacharya·Martin Donachie·Hirosane Fujii·Akihiko Fukui·Yuki Hirao·Yoshitaka Itow·Rintaro Kirikawa·Iona Kondo·Naoki Koshimoto·Man Cheung Alex Li·Yutaka Matsubara·Yasushi Muraki·Shota Miyazaki·Greg Olmschenk·Clément Ranc·Nicholas J. Rattenbury·Yuki Satoh·Hikaru Shoji·Stela Ishitani Silva·Takahiro Sumi·Daisuke Suzuki·Yuzuru Tanaka·Paul J. Tristram·Tsubasa Yamawaki·Atsunori Yonehara
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Abstract

In this work, we update and develop algorithms for KMTNet tender-love care (TLC) photometry in order to create an new, mostly automated, TLC pipeline. We then start a project to systematically apply the new TLC pipeline to the historic KMTNet microlensing events, and search for buried planetary signals. We report the discovery of such a planet candidate in the microlensing event MOA-2019-BLG-421/KMT-2019-BLG-2991. The anomalous signal can be explained by either a planet around the lens star or the orbital motion of the source star. For the planetary interpretation, despite many degenerate solutions, the planet is most likely to be a Jovian planet orbiting an M or K dwarf, which is a typical microlensing planet. The discovery proves that the project can indeed increase the sensitivity of historic events and find previously undiscovered signals.

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Hongjing Yang, Jennifer C. Yee, Kyu-Ha Hwang, Qiyue Qian, Ian A. Bond, Andrew Gould, Zhecheng Hu, Jiyuan Zhang, Shude Mao, Wei Zhu, Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Youn Kil Jung, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Weicheng Zang, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Martin Donachie, Hirosane Fujii, Akihiko Fukui, Yuki Hirao, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Naoki Koshimoto, Man Cheung Alex Li, Yutaka Matsubara, Yasushi Muraki, Shota Miyazaki, Greg Olmschenk, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Hikaru Shoji, Stela Ishitani Silva, Takahiro Sumi, Daisuke Suzuki, Yuzuru Tanaka, Paul J. Tristram, Tsubasa Yamawaki, Atsunori Yonehara. 2023-11-08. Systematic Reanalysis of KMTNet microlensing events, Paper I: Updates of the Photometry Pipeline and a New Planet Candidate. https://doi.org/10.1093/mnras/stad3672

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