Systematic KMTNet Planetary Anomaly Search. I. OGLE-2019-BLG-1053Lb, a Buried Terrestrial Planet

Zang, Weicheng; Hwang, Kyu-Ha; Udalski, Andrzej; Wang, Tianshu; Zhu, Wei; Sumi, Takahiro; Yee, Jennifer C; Gould, Andrew; Mao, Shude; Zhang, Xiangyu; Albrow, Michael D; Chung, Sun-Ju; Han, Cheongho; Jung, Youn Kil; Ryu, Yoon-Hyun; Shin, In-Gu; Shvartzvald, Yossi; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Hyoun-Woo; Kim, Seung-Lee; Lee, Chung-Uk; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Pogge, Richard W; Mróz, Przemek; Skowron, Jan; Poleski, Radoslaw; Szymański, Michał K; Soszyński, Igor; Pietrukowicz, Paweł; Kozłowski, Szymon; Ulaczyk, Krzysztof; Rybicki, Krzysztof A; Iwanek, Patryk; Wrona, Marcin; Gromadzki, Mariusz; Bond, Ian A; Abe, Fumio; Barry, Richard; Bennett, David P; Bhattacharya, Aparna; Donachie, Martin; Fujii, Hirosane; Fukui, Akihiko; Hirao, Yuki; Itow, Yoshitaka; Kirikawa, Rintaro; Kondo, Iona; Koshimoto, Naoki; Li, Man Cheung Alex; Matsubara, Yutaka; Muraki, Yasushi; Miyazaki, Shota; Olmschenk, Greg; Ranc, Clément; Rattenbury, Nicholas J; Satoh, Yuki; Shoji, Hikaru; Silva, Stela Ishitani; Suzuki, Daisuke; Tanaka, Yuzuru; Tristram, Paul J; Yamawaki, Tsubasa; Yonehara, Atsunori; Beichman, Charles A; Bryden, Geoffery; Novati, Sebastiano Calchi; Carey, Sean; Gaudi, B Scott; Henderson, Calen B; Johnson, Samson

Systematic KMTNet Planetary Anomaly Search. I. OGLE-2019-BLG-1053Lb, a Buried Terrestrial Planet

Zang, Weicheng ; Hwang, Kyu-Ha ; Udalski, Andrzej ; Wang, Tianshu ; Zhu, Wei ; Sumi, Takahiro ; Yee, Jennifer C ; Gould, Andrew ; Mao, Shude ; Zhang, Xiangyu ; Albrow, Michael D ; Chung, Sun-Ju ; Han, Cheongho ; Jung, Youn Kil ; Ryu, Yoon-Hyun ; Shin, In-Gu ; Shvartzvald, Yossi ; Cha, Sang-Mok ; Kim, Dong-Jin ; Kim, Hyoun-Woo ; Kim, Seung-Lee ; Lee, Chung-Uk ; Lee, Dong-Joo ; Lee, Yongseok ; Park, Byeong-Gon ; Pogge, Richard W ; Mróz, Przemek ; Skowron, Jan ; Poleski, Radoslaw ; Szymański, Michał K ; Soszyński, Igor ; Pietrukowicz, Paweł ; Kozłowski, Szymon ; Ulaczyk, Krzysztof ; Rybicki, Krzysztof A ; Iwanek, Patryk ; Wrona, Marcin ; Gromadzki, Mariusz ; Bond, Ian A ; Abe, Fumio ; Barry, Richard ; Bennett, David P ; Bhattacharya, Aparna ; Donachie, Martin ; Fujii, Hirosane ; Fukui, Akihiko ; Hirao, Yuki ; Itow, Yoshitaka ; Kirikawa, Rintaro ; Kondo, Iona ; Koshimoto, Naoki ; Li, Man Cheung Alex ; Matsubara, Yutaka ; Muraki, Yasushi ; Miyazaki, Shota ; Olmschenk, Greg ; Ranc, Clément ; Rattenbury, Nicholas J ; Satoh, Yuki ; Shoji, Hikaru ; Silva, Stela Ishitani ; Suzuki, Daisuke ; Tanaka, Yuzuru ; Tristram, Paul J ; Yamawaki, Tsubasa ; Yonehara, Atsunori ; Beichman, Charles A ; Bryden, Geoffery ; Novati, Sebastiano Calchi ; Carey, Sean ; Gaudi, B Scott ; Henderson, Calen B ; Johnson, Samson

Identifier: https://hdl.handle.net/2292/63192

Issue Date: 2021-10-01

Reference: (2021). The Astronomical Journal, 162(4), 163-.

Rights: Copyright: American Astronomical Society

Rights (URI): https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm

Abstract:

In order to exhume the buried signatures of "missing planetary caustics"in Korea Microlensing Telescope Network (KMTNet) data, we conducted a systematic anomaly search of the residuals from point-source point-lens fits, based on a modified version of the KMTNet EventFinder algorithm. This search revealed the lowest-mass-ratio planetary caustic to date in the microlensing event OGLE-2019-BLG-1053, for which the planetary signal had not been noticed before. The planetary system has a planet-host mass ratio of q = (1.25 ± 0.13) × 10-5. A Bayesian analysis yielded estimates of the mass of the host star, Mhost = 0.61-0.24+0.29M⊙ , the mass of its planet, Mplanet = 2.48-0.98+1.19 M⊕, the projected planet-host separation, aperp = 3.4-0.5+0.5 au, and the lens distance, DL = 6.8-0.9+0.6 kpc. The discovery of this very-low-mass-ratio planet illustrates the utility of our method and opens a new window for a large and homogeneous sample to study the microlensing planet-host mass ratio function down to q ∼ 10-5.

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