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OGLE-2018-BLG-1700L: Microlensing Planet in Binary Stellar System

  • Authors: Cheongho Han, Chung-Uk Lee, Andrzej Udalski, Andrew Gould, Ian A. Bond, Michael D. Albrow, Sun-Ju Chung, Kyu-Ha Hwang, Youn Kil Jung, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Weicheng Zang, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, M. James Jee, Doeon 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, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Martin Donachie, Hirosane Fujii, Akihiko Fukui, Yoshitaka Itow, Yuki Hirao, Yuhei Kamei, Iona Kondo, Naoki Koshimoto, Man Cheung Alex Li, Yutaka Matsubara, Yasushi Muraki, Shota Miyazaki, Masayuki Nagakane, Clément Ranc, Nicholas J. Rattenbury, Haruno Suematsu, Denis J. Sullivan, Takahiro Sumi, Daisuke Suzuki, Paul J. Tristram, Takeharu Yamakawa, and Atsunori Yonehara

2020 The Astronomical Journal 159 48.

  • Provider: AAS Journals

Caption: Figure 2.

Decomposition of the anomaly into two parts produced by two binary-lens single-source (2L1S) events. The blue and red curves are the models of the 2L1S solutions obtained by fitting two sets of data, for each of which a part of the data is excluded. For the first data set, the data in the region ﹩8387.0\lt {\mathrm{HJD}}^{{\prime} }\equiv \mathrm{HJD} \mbox{-} {\rm{2450,000}}\lt 8395.5﹩ are excluded, while for the second set, the data in the region 8389.5 < HJD′ < 8405.0 are excluded. The 2L1S fit to the first data set results in a 2L1S solution (blue curve) with a very low mass ratio of q ∼ 0.01, and thus we designate the model as planetary. The fit to the second data set (red curve), on the other hand, results in q ∼ 0.3, and thus the solution is designated as binary. The upper panels show the lens system configurations of the planetary (left panel) and binary (right panel) solutions. For each panel, the closed concave curve represents the caustic and the line with an arrow indicates the source trajectory.

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