KMT-2018-BLG-1743: planetary microlensing event occurring on two source stars
Cheongho Han,Michael D. Albrow,Sun-Ju Chung,Andrew Gould,Kyu-Ha Hwang,Youn Kil Jung,Doeon Kim,Hyoun-Woo Kim,Chung-Uk Lee,Yoon-Hyun Ryu,In-Gu Shin,Yossi Shvartzvald,Jennifer C. Yee,Weicheng Zang,Sang-Mok Cha,Dong-Jin Kim,Seung-Lee Kim,Dong-Joo Lee,Yongseok Lee,Byeong-Gon Park,Richard W. Pogge +20 more
TLDR
The analysis of the microlensing event KMT-2018-BLG-1743 is presented in this article, where it is shown that 2L2S interpretations with a planetary lens system and a binary source best explain the observed light curve with the values of the relative lens-source proper motion expected from the two degenerate solutions.Abstract:
We present the analysis of the microlensing event KMT-2018-BLG-1743. The light curve of the event, with a peak magnification $A_{\rm peak}\sim 800$, exhibits two anomaly features, one around the peak and the other on the falling side of the light curve. An interpretation with a binary lens and a single source (2L1S) cannot describe the anomalies. By conducting additional modeling that includes an extra lens (3L1S) or an extra source (2L2S) relative to a 2L1S interpretation, we find that 2L2S interpretations with a planetary lens system and a binary source best explain the observed light curve with $\Delta\chi^2\sim 188$ and $\sim 91$ over the 2L1S and 3L1S solutions, respectively. Assuming that these $\Delta\chi^2$ values are adequate for distinguishing the models, the event is the fourth 2L2S event and the second 2L2S planetary event. The 2L2S interpretations are subject to a degeneracy, resulting in two solutions with $s>1.0$ (wide solution) and $s<1.0$ (close solution). The masses of the lens components and the distance to the lens are $(M_{\rm host}/M_\odot, M_{\rm planet}/M_{\rm J}, D_{\rm L}/{\rm kpc}) \sim (0.19^{+0.27}_{-0.111}, 0.25^{+0.34}_{-0.14}, 6.48^{+0.94}_{-1.03})$ and $\sim (0.42^{+0.34}_{-0.25}, 1.61^{+1.30}_{-0.97}, 6.04^{+0.93}_{-1.27})$ according to the wide and close solutions, respectively. The source is a binary composed of an early G dwarf and a mid M dwarf. The values of the relative lens-source proper motion expected from the two degenerate solutions, $\mu_{\rm wide}\sim 2.3 $mas yr$^{-1}$ and $\mu_{\rm close} \sim 4.1 $mas yr$^{-1}$, are substantially different, and thus the degeneracy can be broken by resolving the lens and source from future high-resolution imaging observations.read more
Citations
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KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars
Cheongho Han,Andrew Gould,Doeon Kim,Y. K. Jung,Michael Albrow,Sun-Ju Chung,K.-H. Hwang,Chung-Uk Lee,Yoon-Hyun Ryu,In-Gu Shin,Yossi Shvartzvald,Jennifer C. Yee,Weicheng Zang,Sang-Mok Cha,Dong-Jin Kim,Seung-Lee Kim,Dong-Joo Lee,Yongseok Lee,Byeong-Gon Park,Richard W. Pogge +19 more
TL;DR: In this article , a 2L2S model was proposed for the microlensing event KMT-2021-BLG-1898, where both the lens and the source are binary.
Journal ArticleDOI
Systematic KMTNet Planetary Anomaly Search. VI. Complete Sample of 2018 Sub-prime-field Planets
Youn Kil Jung,Weicheng Zang,Cheongho Han,Andrew Gould,Andrzej Udalski,Michael Albrow,Sun-Ju Chung,K.-H. Hwang,Yoon-Hyun Ryu,In-Gu Shin,Yossi Shvartzvald,Hongjing Yang,Jennifer C. Yee,Sang-Mok Cha,Dong-Jin Kim,Seung-Lee Kim,Chung-Uk Lee,Dong-Joo Lee,Yongseok Lee,Byeong-Gon Park,Richard W. Pogge,Przemek Mr'oz,Michal K. Szyma'nski,Jan Skowron,R. Poleski,Igor Soszy'nski,P. Pietrukowicz,Szymon Kozłowski,Krzysztof Ulaczyk,K. Rybicki,Patryk Iwanek,Marcin Wrona +31 more
TL;DR: In this paper , the authors complete the analysis of all 2018 sub-prime-field microlensing planets identified by the KMTNet AnomalyFinder and show that only 1 of the 5 noncaustic anomalies with planet-host mass ratio q < 10−3 was discovered by eye.
Journal ArticleDOI
KMT-2021-BLG-0240: Microlensing event with a deformed planetary signal
Cheongho Han,Doeon Kim,Hongjing Yang,Andrew Gould,Y. K. Jung,Michael Albrow,Sun-Ju Chung,K.-H. Hwang,Chung-Uk Lee,Yoon-Hyun Ryu,In-Gu Shin,Yossi Shvartzvald,Jennifer C. Yee,Weicheng Zang,Sang-Mok Cha,Dong-Jin Kim,Seung-Lee Kim,Dong-Joo Lee,Yongseok Lee,Byeong-Gon Park,Richard W. Pogge +20 more
TL;DR: In this article , the light curve of the microlensing event KMT-2021-BLG-0240 exhibits a short-lasting anomaly with complex features near the peak at the 0.1 mag level from a single-lens single-source model.
Journal ArticleDOI
OGLE-2018-BLG-0584 and KMT-2018-BLG-2119: Two microlensing events with two lens masses and two source stars
Cheongho Han,Andrzej Udalski,Y. K. Jung,Doeon Kim,Hongjing Yang,Michael Albrow,Sun-Ju Chung,Andrew Gould,K.-H. Hwang,Hyoung-Woo Kim,Chung-Uk Lee,Yoon-Hyun Ryu,Yossi Shvartzvald,In-Gu Shin,Jennifer C. Yee,Weicheng Zang,Sang-Mok Cha,Dong-Jin Kim,Seung-Lee Kim,Dong-Joo Lee,Yongseok Lee,Byeong-Gon Park,Richard W. Pogge,Chun-Hewy Kim,Woong Kim,P. Mr'oz,Michal K. Szyma'nski,Jan Skowron,Radosław Poleski,Igor Soszy'nski,P. Pietrukowicz,Szymon Kozłowski,K. Rybicki,Patryk Iwanek,Krzysztof Ulaczyk,Marcin Wrona,Mariusz Gromadzki +36 more
TL;DR: In this article , the authors conduct a systematic investigation of the microlensing data collected during the previous observation seasons for the purpose of reanalyzing anomalous lensing events with no suggested plausible models.
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