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Probable brown dwarf companions detected in binary microlensing events during the 2018-2020 seasons of the KMTNet survey

by Miyazaki, Shota , Pogge, Richard W , Hyoun-Woo, Kim , Yee, Jennifer C , Sang-Mok Cha , Sumi, Takahiro , Shvartzvald, Yossi , Rattenbury, Nicholas J , Matsubara, Yutaka , Gould, Andrew , Abe, Fumio , Olmschenk, Greg , Vandorou, Aikaterini , Han, Cheongho , Kondo, Iona , Bond, Ian A , Kirikawa, Rintaro , Sun-Ju, Chung , Park, Byeong-Gon , Itow, Yoshitaka , Shin, In-Gu , Hirao, Yuki , Muraki, Yasushi , Hibiki Yama , Satoh, Yuki , Tristram, Paul J , Ranc, Clément , Yoon-Hyun, Ryu , Jung, Youn Kil , Albrow, Michael D , Bozza, Valerio , Chung-Uk, Lee , Suzuki, Daisuke , Dong-Jin, Kim , Stela Ishitani Silva , Barry, Richard , Toda, Taiga , Okamura, Arisa , Fujii, Hirosame , Koshimoto, Naoki , Matsumoto, Sho , Kim, Doeon , Zang, Weicheng , Bennett, David P , Seung-Lee, Kim , Dong-Joo, Lee , Lee, Yongseok , Yang, Hongjing , Fukui, Akihiko , Kyu-Ha Hwang , Bhattacharya, Aparna

in Brown dwarf stars / Lenses / Microlenses / Seasons

2023

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Probable brown dwarf companions detected in binary microlensing events during the 2018-2020 seasons of the KMTNet survey

in Brown dwarf stars / Lenses / Microlenses / Seasons

2023

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Probable brown dwarf companions detected in binary microlensing events during the 2018-2020 seasons of the KMTNet survey

in Brown dwarf stars / Lenses / Microlenses / Seasons

2023

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Paper

Probable brown dwarf companions detected in binary microlensing events during the 2018-2020 seasons of the KMTNet survey

Miyazaki, Shota,

Pogge, Richard W,

Hyoun-Woo, Kim,

Yee, Jennifer C,

Sang-Mok Cha,

Sumi, Takahiro,

Shvartzvald, Yossi,

Rattenbury, Nicholas J,

Matsubara, Yutaka,

Gould, Andrew,

Abe, Fumio,

Olmschenk, Greg,

Vandorou, Aikaterini,

Han, Cheongho,

Kondo, Iona,

Bond, Ian A,

Kirikawa, Rintaro,

Sun-Ju, Chung,

Park, Byeong-Gon,

Itow, Yoshitaka,

Shin, In-Gu,

Hirao, Yuki,

Muraki, Yasushi,

Hibiki Yama,

Satoh, Yuki,

Tristram, Paul J,

Ranc, Clément,

Yoon-Hyun, Ryu,

Jung, Youn Kil,

Albrow, Michael D,

Bozza, Valerio,

Chung-Uk, Lee,

Suzuki, Daisuke,

Dong-Jin, Kim,

Stela Ishitani Silva,

Barry, Richard,

Toda, Taiga,

Okamura, Arisa,

Fujii, Hirosame,

Koshimoto, Naoki,

Matsumoto, Sho,

Kim, Doeon,

Zang, Weicheng,

Bennett, David P,

Seung-Lee, Kim,

Dong-Joo, Lee,

Lee, Yongseok,

Yang, Hongjing,

Fukui, Akihiko,

Kyu-Ha Hwang,

Bhattacharya, Aparna

2023

Overview

We inspect the microlensing data of the KMTNet survey collected during the 2018--2020 seasons in order to find lensing events produced by binaries with brown-dwarf companions. In order to pick out binary-lens events with candidate BD lens companions, we conduct systematic analyses of all anomalous lensing events observed during the seasons. By applying the selection criterion with mass ratio between the lens components of \\(0.03\\lesssim q\\lesssim 0.1\\), we identify four binary-lens events with candidate BD companions, including KMT-2018-BLG-0321, KMT-2018-BLG-0885, KMT-2019-BLG-0297, and KMT-2019-BLG-0335. For the individual events, we present the interpretations of the lens systems and measure the observables that can constrain the physical lens parameters. The masses of the lens companions estimated from the Bayesian analyses based on the measured observables indicate that the probabilities for the lens companions to be in the brown-dwarf mass regime are high: 59\\%, 68\\%, 66\\%, and 66\\% for the four events respectively.

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Publisher

Cornell University Library, arXiv.org

Subject

Brown dwarf stars

/ Lenses

/ Microlenses

/ Seasons