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KMT-2019-BLG-1339L: An M Dwarf with a Giant Planet or a Companion near the Planet/Brown Dwarf Boundary

Han, Cheongho and Kim, Doeon and Udalski, Andrzej and Gould, Andrew and Albrow, Michael D. and Chung, Sun-Ju and Hwang, Kyu-Ha and Jung, Youn Kil and Lee, Chung-Uk and Ryu, Yoon-Hyun and Shin, In-Gu and Shvartzvald, Yossi and Yee, Jennifer C. and Zang, Weicheng and Cha, Sang-Mok and Kim, Dong-Jin and Kim, Hyoun-Woo and Kim, Seung-Lee 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, Radosław 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 (2020) KMT-2019-BLG-1339L: An M Dwarf with a Giant Planet or a Companion near the Planet/Brown Dwarf Boundary. Astronomical Journal, 160 (2). Art. No. 64. ISSN 1538-3881. https://resolver.caltech.edu/CaltechAUTHORS:20200713-132628807

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Abstract

We analyze KMT-2019-BLG-1339, a microlensing event with an obvious but incompletely resolved brief anomaly feature around the peak of the light curve. Although the origin of the anomaly is identified to be a companion to the lens with a low mass ratio q, the interpretation is subject to two different degeneracy types. The first type is the ambiguity in ρ, representing the angular source radius scaled to the angular radius of the Einstein ring, θ_E, and the other is the s ↔ s⁻¹ degeneracy. The former type, "finite-source degeneracy," causes ambiguities in both s and q, while the latter induces an ambiguity only in s. Here, s denotes the separation (in units of θ_E) in projection between the lens components. We estimate that the lens components have masses (M₁,M₂)∼(0.27^(+0.36)_(−0.15) M⊙,11⁺¹⁶₋₇ M_J) and ~(0.48^(+0.40)_(−0.28) M⊙, 1.3^(+1.1)_(−0.7) M_J) according to the two solutions subject to the finite-source degeneracy, indicating that the lens comprises an M dwarf and a companion with a mass around the planet/brown dwarf boundary or a Jovian-mass planet. It is possible to lift the finite-source degeneracy by conducting future observations utilizing a high-resolution instrument because the relative lens–source proper motion predicted by the solutions is widely different.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-3881/ab9a3eDOIArticle
https://arxiv.org/abs/2003.02375arXivDiscussion Paper
ORCID:
AuthorORCID
Han, Cheongho0000-0002-2641-9964
Udalski, Andrzej0000-0001-5207-5619
Albrow, Michael D.0000-0003-3316-4012
Chung, Sun-Ju0000-0001-6285-4528
Hwang, Kyu-Ha0000-0002-9241-4117
Jung, Youn Kil0000-0002-0314-6000
Lee, Chung-Uk0000-0003-0043-3925
Ryu, Yoon-Hyun0000-0001-9823-2907
Shin, In-Gu0000-0002-4355-9838
Shvartzvald, Yossi0000-0003-1525-5041
Yee, Jennifer C.0000-0001-9481-7123
Zang, Weicheng0000-0001-6000-3463
Cha, Sang-Mok0000-0002-7511-2950
Kim, Hyoun-Woo0000-0001-8263-1006
Kim, Seung-Lee0000-0003-0562-5643
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, Radosław0000-0002-9245-6368
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
Gromadzki, Mariusz0000-0002-1650-1518
Additional Information:© 2020 The American Astronomical Society. Received 2020 March 4; revised 2020 May 15; accepted 2020 June 5; published 2020 July 13. The work by C.H. was supported by the grants of the National Research Foundation of Korea (2017R1A4A1015178 and 2019R1A2C2085965). The work by A.G. was supported by the JPL grant 1500811. The OGLE project has received funding from the National Science Centre, Poland, grant MAESTRO 2014/14/A/ST9/00121 to A.U.. 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.
Funders:
Funding AgencyGrant Number
National Research Foundation of Korea2017R1A4A1015178
National Research Foundation of Korea2019R1A2C2085965
JPL1500811
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
Subject Keywords:Gravitational microlensing exoplanet detection ; Gravitational microlensing
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Gravitational microlensing exoplanet detection (2147); Gravitational microlensing (672)
Record Number:CaltechAUTHORS:20200713-132628807
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200713-132628807
Official Citation:Cheongho Han et al 2020 AJ 160 64
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104359
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Jul 2020 21:08
Last Modified:13 Jul 2020 21:08

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