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arXiv · 2104.00293

KMT-2019-BLG-1715: planetary microlensing event with three lens masses and two source stars

Cheongho Han·Andrzej Udalski·Doeone Kim·Youn Kil Jung·Chung-Uk Lee·Ian A. Bond·Michael D. Albrow·Sun-Ju Chung·Andrew Gould·Kyu-Ha Hwang·Hyoun-Woo Kim·Yoon-Hyun Ryu·In-Gu Shin·Yossi Shvartzvald·Weicheng Zang·Jennifer C. Yee·Sang-Mok Cha·Dong-Jin Kim·Seung-Lee Kim·Dong-Joo Lee·Yongseok Lee·Byeong-Gon Park·Richard W. Pogge·Chun-Hwey Kim·Woong-Tae Kim·Przemek Mróz·Michał K. Szymański·Jan Skowron·Radek Poleski·Igor Soszyński·Paweł Pietrukowicz·Szymon Kozłowski·Krzysztof Ulaczyk·Krzysztof A. Rybicki·Patryk Iwanek·Marcin Wrona·Mariusz Gromadzki·Fumio Abe·Richard Barry·David P. Bennett·Aparna Bhattacharya·Martin Donachie·Hirosane Fujii·Akihiko Fukui·Yoshitaka Itow·Yuki Hirao·Rintaro Kirikawa·Iona Kondo·Man Cheung Alex Li·Yutaka Matsubara·Yasushi Muraki·Shota Miyazaki·Clément Ranc·Nicholas J. Rattenbury·Yuki Satoh·Hikaru Shoji·Haruno Suematsu·Takahiro Sumi·Daisuke Suzuki·Yuzuru Tanaka·Paul J. Tristram·Takeharu Yamakawa·Tsubasa Yamawaki·Atsunori Yonehara
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Abstract

We investigate the gravitational microlensing event KMT-2019-BLG-1715, of which light curve shows two short-term anomalies from a caustic-crossing binary-lensing light curve: one with a large deviation and the other with a small deviation. We identify five pairs of solutions, in which the anomalies are explained by adding an extra lens or source component in addition to the base binary-lens model. We resolve the degeneracies by applying a method, in which the measured flux ratio between the first and second source stars is compared with the flux ratio deduced from the ratio of the source radii. Applying this method leaves a single pair of viable solutions, in both of which the major anomaly is generated by a planetary-mass third body of the lens, and the minor anomaly is generated by a faint second source. A Bayesian analysis indicates that the lens comprises three masses: a planet-mass object with $\sim 2.6~M_{\rm J}$ and binary stars of K and M dwarfs lying in the galactic disk. We point out the possibility that the lens is the blend, and this can be verified by conducting high-resolution followup imaging for the resolution of the lens from the source.

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Cheongho Han, Andrzej Udalski, Doeone Kim, Youn Kil Jung, Chung-Uk Lee, Ian A. Bond, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Kyu-Ha Hwang, Hyoun-Woo Kim, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Weicheng Zang, Jennifer C. Yee, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Chun-Hwey Kim, Woong-Tae Kim, Przemek Mróz, Michał K. Szymański, Jan Skowron, Radek Poleski, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek, Marcin Wrona, Mariusz Gromadzki, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Martin Donachie, Hirosane Fujii, Akihiko Fukui, Yoshitaka Itow, Yuki Hirao, Rintaro Kirikawa, Iona Kondo, Man Cheung Alex Li, Yutaka Matsubara, Yasushi Muraki, Shota Miyazaki, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Hikaru Shoji, Haruno Suematsu, Takahiro Sumi, Daisuke Suzuki, Yuzuru Tanaka, Paul J. Tristram, Takeharu Yamakawa, Tsubasa Yamawaki, Atsunori Yonehara. 2021-04-01. KMT-2019-BLG-1715: planetary microlensing event with three lens masses and two source stars. https://doi.org/10.3847/1538-3881%2Fabf4d0

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