KMT-2022-BLG-0086: Another binary-lens binary-source microlensing event
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| Natura: | Preprint |
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2025
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| author | Chung, Sun-Ju Hwang, Kyu-Ha Yee, Jennifer C. Gould, Andrew Bond, Ian A. Yang, Hongjing Albrow, Michael D. Jung, Youn Kil Han, Cheongho Ryu, Yoon-Hyun Shin, In-Gu Shvartzvald, Yossi Zang, Weicheng Cha, Sang-Mok Kim, Dong-Jin Kim, Seung-Lee Lee, Chung-Uk Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. Abe, Fumio Bennett, David P. Bhattacharya, Aparna Fukui, Akihiko Hamada, Ryusei Hirao, Yuki Silva, Stela Ishitani Koshimoto, Naoki Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Terry, Sean K. Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki |
| author_facet | Chung, Sun-Ju Hwang, Kyu-Ha Yee, Jennifer C. Gould, Andrew Bond, Ian A. Yang, Hongjing Albrow, Michael D. Jung, Youn Kil Han, Cheongho Ryu, Yoon-Hyun Shin, In-Gu Shvartzvald, Yossi Zang, Weicheng Cha, Sang-Mok Kim, Dong-Jin Kim, Seung-Lee Lee, Chung-Uk Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. Abe, Fumio Bennett, David P. Bhattacharya, Aparna Fukui, Akihiko Hamada, Ryusei Hirao, Yuki Silva, Stela Ishitani Koshimoto, Naoki Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Terry, Sean K. Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki |
| contents | 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 $Δχ^{2} \simeq 9$. Although the event has noticeable anomalies around the peak of the light curve, they are not enough covered to constrain the angular Einstein radius $θ_{\rm E}$, thus we only measure the minimum angular Einstein radius $θ_{\rm E,min}$. From the Bayesian analysis, it is found that that the binary lens system is a binary star with masses of $(m_1,m_2)=(0.46^{+0.35}_{-0.25}\, M_\odot, 0.75^{+0.67}_{-0.55}\, M_\odot)$ at a distance of $D_{\rm L}=5.87^{+1.21}_{-1.79}$ 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 $(m_1,m_2,m_3)=(0.43^{+0.41}_{-0.35}\, M_\odot, 0.056^{+0.055}_{-0.047}\, M_\odot, 20.84^{+20.20}_{-17.04}\, M_{\rm J})$ at a distance of $D_{\rm L}=4.06^{+1.39}_{-3.28}$ kpc, indicating a disk lens system. The 2L2S model yields the relative lens-source proper motion of $μ_{\rm rel} \geqslant 4.6\, \rm mas\, yr^{-1}$ that is consistent with the Bayesian result, whereas the 3L1S model yields $μ_{\rm rel} \geqslant 18.9\, \rm mas\, yr^{-1}$, which is more than three times larger than that of a typical disk object of $\sim 6\, \rm mas\, yr^{-1}$ and thus is not consistent with the Bayesian result. This suggests that the event is likely caused by the binary-lens binary-source model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_20914 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | KMT-2022-BLG-0086: Another binary-lens binary-source microlensing event Chung, Sun-Ju Hwang, Kyu-Ha Yee, Jennifer C. Gould, Andrew Bond, Ian A. Yang, Hongjing Albrow, Michael D. Jung, Youn Kil Han, Cheongho Ryu, Yoon-Hyun Shin, In-Gu Shvartzvald, Yossi Zang, Weicheng Cha, Sang-Mok Kim, Dong-Jin Kim, Seung-Lee Lee, Chung-Uk Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. Abe, Fumio Bennett, David P. Bhattacharya, Aparna Fukui, Akihiko Hamada, Ryusei Hirao, Yuki Silva, Stela Ishitani Koshimoto, Naoki Miyazaki, Shota Muraki, Yasushi Nagai, Tutumi Nunota, Kansuke Olmschenk, Greg Ranc, Clément Rattenbury, Nicholas J. Satoh, Yuki Sumi, Takahiro Suzuki, Daisuke Terry, Sean K. Tristram, Paul J. Vandorou, Aikaterini Yama, Hibiki Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies 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 $Δχ^{2} \simeq 9$. Although the event has noticeable anomalies around the peak of the light curve, they are not enough covered to constrain the angular Einstein radius $θ_{\rm E}$, thus we only measure the minimum angular Einstein radius $θ_{\rm E,min}$. From the Bayesian analysis, it is found that that the binary lens system is a binary star with masses of $(m_1,m_2)=(0.46^{+0.35}_{-0.25}\, M_\odot, 0.75^{+0.67}_{-0.55}\, M_\odot)$ at a distance of $D_{\rm L}=5.87^{+1.21}_{-1.79}$ 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 $(m_1,m_2,m_3)=(0.43^{+0.41}_{-0.35}\, M_\odot, 0.056^{+0.055}_{-0.047}\, M_\odot, 20.84^{+20.20}_{-17.04}\, M_{\rm J})$ at a distance of $D_{\rm L}=4.06^{+1.39}_{-3.28}$ kpc, indicating a disk lens system. The 2L2S model yields the relative lens-source proper motion of $μ_{\rm rel} \geqslant 4.6\, \rm mas\, yr^{-1}$ that is consistent with the Bayesian result, whereas the 3L1S model yields $μ_{\rm rel} \geqslant 18.9\, \rm mas\, yr^{-1}$, which is more than three times larger than that of a typical disk object of $\sim 6\, \rm mas\, yr^{-1}$ and thus is not consistent with the Bayesian result. This suggests that the event is likely caused by the binary-lens binary-source model. |
| title | KMT-2022-BLG-0086: Another binary-lens binary-source microlensing event |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2506.20914 |