KMT-2022-BLG-0086: Another Binary-lens Binary-source Microlensing Event

KMT-2022-BLG-0086: Another Binary-lens Binary-source Microlensing Event

We present the analysis of a microlensing event KMT-2022-BLG-0086 of which the overall light curve is not described by a binary-lens single-source (2L1S) model, which suggests the existence of an extra lens or an extra source. We found that the event is best explained by the binary-lens binary-sourc...

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Main Authors: Sun-Ju Chung, Kyu-Ha Hwang, Jennifer C. Yee, Andrew Gould, Ian A. Bond, Hongjing Yang, (Leading Authors), Michael D. Albrow, Youn Kil Jung, Cheongho Han, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Weicheng Zang, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, (The KMTNet Collaboration), Fumio Abe, David P. Bennett, Aparna Bhattacharya, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Naoki Koshimoto, Shota Miyazaki, Yasushi Muraki, Tutumi Nagai, Kansuke Nunota, Greg Olmschenk, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Takahiro Sumi, Daisuke Suzuki, Sean K. Terry, Paul J. Tristram, Aikaterini Vandorou, Hibiki Yama, (The MOA Collaboration)
Format: Article
Language:English
Published: IOP Publishing 2025-01-01
Series:The Astronomical Journal
Subjects:
Gravitational microlensing
Online Access:https://doi.org/10.3847/1538-3881/ade2e7
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Summary:We present the analysis of a microlensing event KMT-2022-BLG-0086 of which the overall light curve is not described by a binary-lens single-source (2L1S) model, which suggests the existence of an extra lens or an extra source. We found that the event is best explained by the binary-lens binary-source (2L2S) model, but the 2L2S model is only favored over the triple-lens single-source (3L1S) model by Δ χ ^2  ≃ 9. Although the event has noticeable anomalies around the peak of the light curve, they are not enough covered to constrain the angular Einstein radius θ _E , thus we only measure the minimum angular Einstein radius ${\theta }_{{\rm{E}},{\rm{\min }}}$ . From the Bayesian analysis, it is found that that the binary lens system is a binary star with masses of $({m}_{1},{m}_{2})=(0.4{6}_{-0.25}^{+0.35}\,{M}_{\odot },0.7{5}_{-0.55}^{+0.67}\,{M}_{\odot })$ at a distance of ${D}_{{\rm{L}}}=5.8{7}_{-1.79}^{+1.21}$ kpc, while the triple lens system is a brown dwarf or a massive giant planet in a low-mass binary-star system with masses of $({m}_{1},{m}_{2},{m}_{3})=(0.4{3}_{-0.35}^{+0.41}\,{M}_{\odot },0.05{6}_{-0.047}^{+0.055}\,{M}_{\odot }$ , $20.8{4}_{-17.04}^{+20.20}\,{M}_{{\rm{J}}})$ at a distance of ${D}_{{\rm{L}}}=4.0{6}_{-3.28}^{+1.39}$ kpc, indicating a disk lens system. The 2L2S model yields the relative lens-source proper motion of μ _rel  ≥ 4.6 mas yr ^−1 that is consistent with the Bayesian result, whereas the 3L1S model yields μ _rel  ≥ 18.9 mas yr ^−1 , which is more than three times larger than that of a typical disk object of ∼6 mas yr ^−1 and thus is not consistent with the Bayesian result. This suggests that the event is likely caused by the binary-lens binary-source model.
ISSN:1538-3881

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