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KMT-2019-BLG-0842Lb: A Cold Planet below the Uranus/Sun Mass Ratio

Jung, Youn Kil and Udalski, Andrzej and Zang, Weicheng and Bond, Ian A. and Yee, Jennifer C. and Han, Cheongho and Albrow, Michael D. and Chung, Sun-Ju and Gould, Andrew and Hwang, Kyu-Ha 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 Szymański, Michał K. and Skowron, Jan and Poleski, Radek and Soszyński, Igor and Pietrukowicz, Paweł and Kozłowski, Szymon and Ulaczyk, Krzysztof and Rybicki, Krzysztof A. and Iwanek, Patryk and Wrona, Marcin and Abe, Fumio and Barry, Richard and Bennett, David P. and Bhattacharya, Aparna and Donachie, Martin and Fujii, Hirosame and Fukui, Akihiko and Hirao, Yuki and Itow, Yoshitaka and Kamei, Yukei and Kondo, Iona and Koshimoto, Naoki and Li, Man Cheung Alex and Matsubara, Yutaka and Miyazaki, Shota and Muraki, Yasushi and Nagakane, Masayuki and Ranc, Clément and Rattenbury, Nicholas J. and Satoh, Yuki and Shoji, Hikaru and Suematsu, Haruno and Sullivan, Denis J. and Sumi, Takahiro and Suzuki, Daisuke and Tristram, Paul J. and Yamakawa, Takeharu and Yamamwaki, Tsubasa and Yonehara, Atsunori (2020) KMT-2019-BLG-0842Lb: A Cold Planet below the Uranus/Sun Mass Ratio. Astronomical Journal, 160 (6). Art. No. 255. ISSN 1538-3881.

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We report the discovery of a cold planet with a very low planet/host mass ratio of q = (4.09 ± 0.27) × 10⁻⁵, which is similar to the ratio of Uranus/Sun (q = 4.37 × 10⁻⁵) in the solar system. The Bayesian estimates for the host mass, planet mass, system distance, and planet–host projected separation are M host = 0.76 ± 0.40M_⊙, M planet = 10.3 ± 5.5M_⊕, D L = 3.3 ± 1.3 kpc, and a ⊥ = 3.3 ± 1.4 au, respectively. The consistency of the color and brightness expected from the estimated lens mass and distance with those of the blend suggests the possibility that the most blended light comes from the planet host, and this hypothesis can be established if high-resolution images are taken during the next (2020) bulge season. We discuss the importance of conducting optimized photometry and aggressive follow-up observations for moderately or very high magnification events to maximize the detection rate of planets with very low mass ratios.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Jung, Youn Kil0000-0002-0314-6000
Udalski, Andrzej0000-0001-5207-5619
Zang, Weicheng0000-0001-6000-3463
Yee, Jennifer C.0000-0001-9481-7123
Han, Cheongho0000-0002-2641-9964
Albrow, Michael D.0000-0003-3316-4012
Chung, Sun-Ju0000-0001-6285-4528
Hwang, Kyu-Ha0000-0002-9241-4117
Ryu, Yoon-Hyun0000-0001-9823-2907
Shin, In-Gu0000-0002-4355-9838
Shvartzvald, Yossi0000-0003-1525-5041
Cha, Sang-Mok0000-0002-7511-2950
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
Szymański, Michał K.0000-0002-0548-8995
Skowron, Jan0000-0002-2335-1730
Poleski, Radek0000-0002-9245-6368
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
Barry, Richard0000-0003-4916-0892
Bennett, David P.0000-0001-8043-8413
Fukui, Akihiko0000-0002-4909-5763
Itow, Yoshitaka0000-0002-8198-1968
Kondo, Iona0000-0002-3401-1029
Koshimoto, Naoki0000-0003-2302-9562
Miyazaki, Shota0000-0001-9818-1513
Ranc, Clément0000-0003-2388-4534
Rattenbury, Nicholas J.0000-0001-5069-319X
Suzuki, Daisuke0000-0002-5843-9433
Yonehara, Atsunori0000-0003-3480-0973
Additional Information:© 2020. The American Astronomical Society. Received 2019 December 8; revised 2020 September 6; accepted 2020 September 16; published 2020 November 10. W.Z. acknowledges support by the National Science Foundation of China (grant No. 11821303 and 11761131004) Work by A.G. was supported by AST-1516842 from the US NSF and by JPL grant 1500811. A.G. received support from the European Research Council under the European Union's Seventh Framework Programme (FP 7) ERC grant Agreement No. [321035] This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI) and the data were obtained at three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia. Work by C.H. was supported by the grants of National Research Foundation of Korea (2017R1A4A1015178 and 2020R1A4A2002885). The OGLE project 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 No. JSPS24253004, JSPS26247023, JSPS23340064, JSPS15H00781, and JP16H06287. Work by C.R. was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by USRA through a contract with NASA.
Funding AgencyGrant Number
National Natural Science Foundation of China11821303
National Natural Science Foundation of China11761131004
European Research Council (ERC)321035
National Research Foundation of Korea2017R1A4A1015178
National Research Roundation of Korea2020R1A4A2002885
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
NASA Postdoctoral ProgramUNSPECIFIED
Subject Keywords:Gravitational microlensing ; Gravitational microlensing exoplanet detection
Issue or Number:6
Classification Code:Unified Astronomy Thesaurus concepts: Gravitational microlensing (672); Gravitational microlensing exoplanet detection (2147)
Record Number:CaltechAUTHORS:20201110-101256082
Persistent URL:
Official Citation:Youn Kil Jung et al 2020 AJ 160 255
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106588
Deposited By: George Porter
Deposited On:10 Nov 2020 20:03
Last Modified:10 Nov 2020 20:03

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