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

Zang, Weicheng and Hwang, Kyu-Ha and Udalski, Andrzej and Wang, Tianshu and Zhu, Wei and Sumi, Takahiro and Yee, Jennifer C. and Gould, Andrew and Mao, Shude and Zhang, Xiangyu and Albrow, Michael D. and Chung, Sun-Ju and Han, Cheongho and Jung, Youn Kil and Ryu, Yoon-Hyun and Shin, In-Gu and Shvartzvald, Yossi and Cha, Sang-Mok and Kim, Dong-Jin and Kim, Hyoun-Woo and Kim, Seung-Lee and Lee, Chung-Uk and Lee, Dong-Joo and Lee, Yongseok and Park, Byeong-Gon and Pogge, Richard W. and Mróz, Przemek and Skowron, Jan and Poleski, Radoslaw and Szymański, Michał-K. and Soszyński, Igor and Pietrukowicz, Paweł and Kozłowski, Szymon and Ulaczyk, Krzysztof and Rybicki, Krzysztof A. and Iwanek, Patryk and Wrona, Marcin and Gromadzki, Mariusz and Bond, Ian A. and Abe, Fumio and Barry, Richard and Bennett, David P. and Bhattacharya, Aparna and Donachie, Martin and Fujii, Hirosane and Fukui, Akihiko and Hirao, Yuki and Itow, Yoshitaka and Kirikawa, Rintaro and Kondo, Iona and Koshimoto, Naoki and Li, Man Cheung Alex and Matsubara, Yutaka and Muraki, Yasushi and Miyazaki, Shota and Olmschenk, Greg and Ranc, Clément and Rattenbury, Nicholas J. and Satoh, Yuki and Shoji, Hikaru and Ishitani Silva, Stela and Suzuki, Daisuke and Tanaka, Yuzuru and Tristram, Paul J. and Yamawaki, Tsubasa and Yonehara, Atsunori and Beichman, Charles A. and Bryden, Geoffery and Calchi Novati, Sebastiano and Carey, Sean and Gaudi, B. Scott and Henderson, Calen B. and Johnson, Samson A. (2021) Systematic KMTNet Planetary Anomaly Search. I. OGLE-2019-BLG-1053Lb, a Buried Terrestrial Planet. Astronomical Journal, 162 (4). Art. No. 163. ISSN 0004-6256. doi:10.3847/1538-3881/ac12d4.

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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, M_(host) = 0.61^(+0.29)_(−0.24) M_⊙, the mass of its planet, M_(planet) = 2.48^(+1.19)_(−0.98) M_⊕, the projected planet–host separation, a_⊥=3.4^(+0.5)_(−0.5) au, and the lens distance, D_L = 6.8^(+0.6)_(−0.9) 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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Zang, Weicheng0000-0001-6000-3463
Hwang, Kyu-Ha0000-0002-9241-4117
Udalski, Andrzej0000-0001-5207-5619
Zhu, Wei0000-0003-4027-4711
Sumi, Takahiro0000-0002-4035-5012
Yee, Jennifer C.0000-0001-9481-7123
Mao, Shude0000-0001-8317-2788
Albrow, Michael D.0000-0003-3316-4012
Chung, Sun-Ju0000-0001-6285-4528
Han, Cheongho0000-0002-2641-9964
Jung, Youn Kil0000-0002-0314-6000
Ryu, Yoon-Hyun0000-0001-9823-2907
Shin, In-Gu0000-0002-4355-9838
Shvartzvald, Yossi0000-0003-1525-5041
Cha, Sang-Mok0000-0002-7511-2950
Kim, Dong-Jin0000-0002-7038-2118
Kim, Hyoun-Woo0000-0001-8263-1006
Kim, Seung-Lee0000-0003-0562-5643
Lee, Chung-Uk0000-0003-0043-3925
Lee, Yongseok0000-0001-7594-8072
Park, Byeong-Gon0000-0002-6982-7722
Pogge, Richard W.0000-0003-1435-3053
Mróz, Przemek0000-0001-7016-1692
Skowron, Jan0000-0002-2335-1730
Poleski, Radoslaw0000-0002-9245-6368
Szymański, Michał-K.0000-0002-0548-8995
Soszyński, Igor0000-0002-7777-0842
Pietrukowicz, Paweł0000-0002-2339-5899
Kozłowski, Szymon0000-0003-4084-880X
Ulaczyk, Krzysztof0000-0001-6364-408X
Rybicki, Krzysztof A.0000-0002-9326-9329
Iwanek, Patryk0000-0002-6212-7221
Wrona, Marcin0000-0002-3051-274X
Gromadzki, Mariusz0000-0002-1650-1518
Barry, Richard0000-0003-4916-0892
Bennett, David P.0000-0001-8043-8413
Fukui, Akihiko0000-0002-4909-5763
Hirao, Yuki0000-0003-4776-8618
Itow, Yoshitaka0000-0002-8198-1968
Kondo, Iona0000-0002-3401-1029
Koshimoto, Naoki0000-0003-2302-9562
Muraki, Yasushi0000-0003-1978-2092
Miyazaki, Shota0000-0001-9818-1513
Ranc, Clément0000-0003-2388-4534
Rattenbury, Nicholas J.0000-0001-5069-319X
Ishitani Silva, Stela0000-0003-2267-1246
Suzuki, Daisuke0000-0002-5843-9433
Yonehara, Atsunori0000-0003-3480-0973
Beichman, Charles A.0000-0002-5627-5471
Bryden, Geoffery0000-0001-5966-837X
Calchi Novati, Sebastiano0000-0002-7669-1069
Carey, Sean0000-0002-0221-6871
Gaudi, B. Scott0000-0003-0395-9869
Henderson, Calen B.0000-0001-8877-9060
Johnson, Samson A.0000-0001-9397-4768
Additional Information:© 2021. The American Astronomical Society. Received 2021 May 28; revised 2021 June 24; accepted 2021 July 7; published 2021 September 24. W.Z., S.M., and X.Z. acknowledge support from the National Science Foundation of China (grant Nos. 11821303 and 11761131004). This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute and the data were obtained at the three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia. OGLE has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U. The MOA project is supported by JSPS KAKENHI grant Nos. JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, JP16H06287, JP17H02871, and JP19KK0082. Work by J.C.Y. was supported by Jet Propulsion Laboratory grant 1571564. Work by C.H. was supported by grants of the National Research Foundation of Korea (2019R1A2C2085965 and 2020R1A4A2002885). This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under a contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Software: pySIS (Albrow et al. 2009), pyDIA (Zenodo, doi:10.5281/zenodo.268049, as developed on GitHub), OGLE DIA pipeline (Wozniak 2000), Spitzer photometry software (Calchi Novati et al. 2015b).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
National Natural Science Foundation of China11821303
National Natural Science Foundation of China11761131004
National Science Centre (Poland)2014/14/A/ST9/00121
Japan Society for the Promotion of Science (JSPS)24253004
Japan Society for the Promotion of Science (JSPS)26247023
Japan Society for the Promotion of Science (JSPS)23340064
Japan Society for the Promotion of Science (JSPS)15H00781
Japan Society for the Promotion of Science (JSPS)16H06287
Japan Society for the Promotion of Science (JSPS)17H02871
Japan Society for the Promotion of Science (JSPS)19KK0082
National Research Foundation of Korea2019R1A2C2085965
National Research Foundation of Korea2020R1A4A2002885
Subject Keywords:Exoplanet detection methods; Gravitational microlensing exoplanet detection
Issue or Number:4
Classification Code:Unified Astronomy Thesaurus concepts: Exoplanet detection methods (489); Gravitational microlensing exoplanet detection (2147)
Record Number:CaltechAUTHORS:20210603-122458964
Persistent URL:
Official Citation:Weicheng Zang et al 2021 AJ 162 163
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109360
Deposited By: George Porter
Deposited On:03 Jun 2021 20:10
Last Modified:08 Aug 2022 20:49

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