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Detection of stellar spots from the observations of caustic-crossing binary-lens gravitational microlensing events [PDF]

, 2000
Recently, Heyrovský & Sasselov investigated the sensitivity of single-lens gravitational microlensing event light curves to spots and found that, during source transit, spots can cause deviations in amplification larger than 2 per cent, and thus be ...
Cheongho Han, Seong-Hong Park, Hoil Kim, Kyongae Chang   +3 more
openalex   +3 more sources

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

Astronomy & Astrophysics, 2023
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.
C. Han, Y. Jung, Doeon Kim, A. Gould, V. Bozza, I. Bond, S. Chung, M. Albrow, K. Hwang, Y. Ryu, I. Shin, Y. Shvartzvald, Hongjing Yang, W. Zang, S. Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, J. Yee, Yongseok Lee, B.-G. Park, R. Pogge, F. Abe, R. Barry, D. Bennett, A. Bhattacharya, H. Fujii, A. Fukui, Y. Hirao, S. I. Silva, R. Kirikawa, I. Kondo, N. Koshimoto, Y. Matsubara, Sho Matsumoto, S. Miyazaki, Y. Muraki, A. Okamura, G. Olmschenk, C. Ranc, N. Rattenbury, Y. Satoh, T. Sumi, D. Suzuki, T. Toda, P. Tristram, A. Vandorou, H. Yama, Y. Itow   +50 more
semanticscholar   +1 more source

KMT-2021-BLG-0322: Severe degeneracy between triple-lens and higher-order binary-lens interpretations [PDF]

Astronomy & Astrophysics, 2021
We investigate the microlensing event KMT-2021-BLG-0322, for which the light curve exhibits three distinctive sets of caustic-crossing features. It is found that the overall features of the light curve are approximately described by a binary-lens (2L1S ...
C. Han, A. Gould, Y. Hirao, Chung-Uk Lee, M. Albrow, Sun-Ju Chung, K. Hwang, Y. Jung, Doeon Kim, S. Mao, Y. Ryu, I. Shin, Y. Shvartzvald, J. Yee, W. Zang, S. Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, R. Pogge, F. Abe, R. Barry, D. Bennett, A. Bhattacharya, I. Bond, M. Donachie, H. Fujii, A. Fukui, Y. Itow, R. Kirikawa, I. Kondo, N. Koshimoto, M. Li, Y. Matsubara, Y. Muraki, S. Miyazaki, C. Ranc, N. Rattenbury, Y. Satoh, H. Shoji, T. Sumi, D. Suzuki, Yuzuru Tanaka, P. Tristram, T. Yamawaki, A. Yonehara   +48 more
semanticscholar   +1 more source

OGLE-2019-BLG-1470LABc: Another Microlensing Giant Planet in a Binary System? [PDF]

Monthly notices of the Royal Astronomical Society, 2022
We report the discovery and analysis of a candidate triple-lens single-source (3L1S) microlensing event, OGLE-2019-BLG-1470. This event was first classified as a normal binary-lens single-source (2L1S) event, but a careful 2L1S modelling showed that it
Renkun Kuang, W. Zang, Y. Jung, A. Udalski, Hongjing Yang, S. Mao, M. Albrow, S. Chung, A. Gould, C. Han, K. Hwang, Y. Ryu, I. Shin, Y. Shvartzvald, J. Yee, S. Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, B.-G. Park, R. Pogge, P. Mr'oz, J. Skowron, R. Poleski, M. Szymański, I. Soszy'nski, P. Pietrukowicz, S. Kozłowski, K. Ulaczyk, K. Rybicki, P. Iwanek, M. Wrona, M. Gromadzki, Hanyue Wang Shuo Huang Wei Zhu   +36 more
semanticscholar   +1 more source

KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars [PDF]

Astronomy & Astrophysics, 2022
Aims. The light curve of the microlensing event KMT-2021-BLG-1898 exhibits a short-term central anomaly with double-bump features that cannot be explained by the usual binary-lens or binary-source interpretations. With the aim of interpreting the anomaly,
C. Han, A. Gould, Doeon Kim, Y. Jung, M. Albrow, S. Chung, K. Hwang, Chung-Uk Lee, Y. Ryu, I. Shin, Y. Shvartzvald, J. Yee, W. Zang, S. Cha, Dong-Jin Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, B.-G. Park, R. Pogge   +19 more
semanticscholar   +1 more source

Improved Aberth-Ehrlich root-finding algorithm and its further application for Binary Microlensing [PDF]

Monthly notices of the Royal Astronomical Society, 2022
In gravitational microlensing formalism and for modeling binary light curves, the key step is solving the binary lens equation. Currently, a combination of the Newton’s and Laguerre’s methods which was first introduced by Skowron & Gould (SG) is used ...
Hossein Fatheddin, S. Sajadian
semanticscholar   +1 more source

Binary microlensing with plasma environment – Star and planet [PDF]

Monthly notices of the Royal Astronomical Society, 2022
Galactic microlensing has been widely used to study stars and planets. The stellar wind plays an important role in the formation, environment, and habitability of the planet.
Jiarui Sun, X. Er, O. Tsupko
semanticscholar   +1 more source

OGLE-2019-BLG-0304: Competing Interpretations between a Planet–binary Model and a Binary-source + Binary-lens Model [PDF]

, 2021
We analyze the microlensing event OGLE-2019-BLG-0304, whose light curve exhibits two distinctive features: a deviation in the peak region and a second bump appearing ∼61 days after the main peak.
C. Han, A. Udalski, Chung-Uk Lee, Doeon Kim, Y. Ryu, M. Albrow, Sun-Ju Chung, A. Gould, K. Hwang, Youn Kil Jung, Hyoun-Woo Kim, I. Shin, Y. Shvartzvald, J. Yee, W. Zang, S. Cha, Dong-Jin Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, R. Pogge, P. Mróz, M. Szymański, J. Skowron, R. Poleski, I. Soszyński, P. Pietrukowicz, S. Kozłowski, K. Ulaczyk, K. Rybicki, P. Iwanek, M. Wrona, M. Gromadzki   +33 more
semanticscholar   +1 more source

OGLE-2017-BLG-1038: A Possible Brown-dwarf Binary Revealed by Spitzer Microlensing Parallax [PDF]

Astronomical Journal, 2022
We report the analysis of microlensing event OGLE-2017-BLG-1038, observed by the Optical Gravitational Lensing Experiment, Korean Microlensing Telescope Network, and Spitzer telescopes.
A. Malpas, M. Albrow, J. Yee, A. Gould, A. Udalski, Antonio Herrera Martin, C. Beichman, G. Bryden, S. Novati, S. Carey, C. Henderson, B. Gaudi, Y. Shvartzvald, Wei Zhu, S. Cha, S. Chung, C. Han, K. Hwang, Y. Jung, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, B.-G. Park, R. Pogge, Y. Ryu, I. Shin, W. Zang, P. Iwanek, S. Kozłowski, P. Mróz, P. Pietrukowicz, R. Poleski, K. Rybicki, J. Skowron, I. Soszyński, M. Szymański, K. Ulaczyk   +39 more
semanticscholar   +1 more source

Precision measurement of a brown dwarf mass in a binary system in the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035 [PDF]

Astronomy & Astrophysics, 2022
Context. Brown dwarfs are poorly understood transition objects between stars and planets, with several competing mechanisms having been proposed for their formation. Mass measurements are generally difficult for isolated objects but also for brown dwarfs
A. Herald, A. Udalski, V. Bozza, P. Rota, I. Bond, J. Yee, S. Sajadian, P. Mróz, R. Poleski, J. Skowron, M. Szymański, I. Soszyński, P. Pietrukowicz, S. Kozłowski, K. Ulaczyk, K. Rybicki, P. Iwanek, M. Wrona, M. Gromadzki, F. Abe, R. Barry, D. Bennett, A. Bhattacharya, A. Fukui, H. Fujii, Y. Hirao, Y. Itow, R. Kirikawa, I. Kondo, N. Koshimoto, Y. Matsubara, S. Matsumoto, S. Miyazaki, Y. Muraki, G. Olmschenk, C. Ranc, A. Okamura, N. Rattenbury, Y. Satoh, T. Sumi, D. Suzuki, S. I. Silva, T. Toda, P. Tristram, A. Vandorou, H. Yama, C. Beichman, G. Bryden, S. Novati, S. Carey, B. Gaudi, A. Gould, C. Henderson, S. Johnson, Y. Shvartzvald, W. Zhu, M. Dominik, M. Hundertmark, U. Jørgensen, P. Longa-Peña, J. Skottfelt, J. Tregloan-Reed, N. Bach-Møller, M. Burgdorf, G. D’Ago, L. Haikala, J. Hitchcock, E. Khalouei, N. Peixinho, S. Rahvar, C. Snodgrass, J. Southworth, P. Spyratos, W. Zang, H. Yang, S. Mao, É. Bachelet, D. Maoz, R. Street, Y. Tsapras, G. Christie, T. Cooper, L. D. Almeida, J. D. Nascimento, J. Green, C. Han, S. Hennerley, A. Marmont, J. Mccormick, L. Monard, T. Natusch, R. Pogge   +91 more
semanticscholar   +1 more source