KMT-2026-BLG-0083L: A Two-Jovian-Planet System Orbiting an M Dwarf Discovered by Microlensing
Abstract
We present the analysis of the microlensing event KMT-2026-BLG-0083, which was independently detected by the KMTNet, OGLE, and PRIME surveys and also monitored by the DREAMS survey. The combined data provide dense coverage of two distinct short-duration anomalies in the light curve that cannot be reproduced by a standard binary-lens model. Independent analyses of the two anomalies indicate that each is produced by a planetary companion to the lens, motivating a triple-lens interpretation. The modeling yields two pairs of degenerate solutions arising from the well-known inner--outer degeneracy, with each pair exhibiting two local solutions depending on whether the source passes above or below the distant planetary companion. The preferred model indicates two giant planets with mass ratios q2=(5.25± 0.08)× 10−3 and q3=(3.04± 0.24)×10−3 orbiting a common host. Bayesian analysis indicates that the host is an M-dwarf star with a mass of 0.48+0.36−0.28 M⊙, hosting two giant planets with masses of 2.65+1.96−1.55 MJ and 1.54+1.14−0.90 MJ. The projected planet--host separations are 10.6+1.7−2.2~au and 1.7+0.3−0.3~au, placing the inner planet near the host's snow line and the outer planet at a substantially larger separation. Thus, KMT-2026-BLG-0083L becomes the seventh confirmed multiple-planet system discovered through gravitational microlensing, providing another example of a cold giant planetary system orbiting a subsolar-mass star.
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BibTeX
@misc{han2026kmt2026blg0083l,
title = {{KMT-2026-BLG-0083L: A Two-Jovian-Planet System Orbiting an M Dwarf Discovered by Microlensing}},
author = {Cheongho Han and Chung-Uk Lee and Zhixing Li and Weicheng Zang and Andrzej Udalski and Ian A. Bond and Yoon-Hyun Ryu and Steve Heathcote and Michael D. Albrow and Sun-Ju Chung and Andrew Gould and Youn Kil Jung and Kyu-Ha Hwang and Hongjing Yang and Yossi Shvartzvald and In-Gu Shin and Doeon Kim and Dong-Jin Kim and Byeong-Gon Park and Richard W. Pogge and Qiyue Qian and Yaosong Yu and Yuchen Tang and Yuxin Shang and Tomas Ahumada and imothy Abbott and Guillermo Damke and Konstantina Boutsia and Alfredo Zenteno and Shude Mao and Andong Xu and Przemek Mróz and Michał K. Szymański and Jan Skowron and Radosław Poleski and Igor Soszyński and Paweł Pietrukowicz and Szymon Kozłowski and Krzysztof A. Rybicki and Patryk Iwanek and Krzysztof Ulaczyk and Marcin Wrona and Mariusz Gromadzki and Mateusz J. Mróz and David P. Bennett and Aparna Bhattacharya and Kotaro Daimon and Ryusei Hamada and Yuki Hirao and Shuma Makida and Stela Ishitani Silva and Shota Miyazaki and Tutumi Nagai and Seiya Nakayama and Kansuke Nunota and Ryo Ogawa and Ryunosuke Oishi and Hideaki Ose and Nicholas J. Rattenbury and Yuki K. Satoh},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.12451},
eprint = {2609.12451},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.12451},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - KMT-2026-BLG-0083L: A Two-Jovian-Planet System Orbiting an M Dwarf Discovered by Microlensing
AU - Cheongho Han
AU - Chung-Uk Lee
AU - Zhixing Li
AU - Weicheng Zang
AU - Andrzej Udalski
AU - Ian A. Bond
AU - Yoon-Hyun Ryu
AU - Steve Heathcote
AU - Michael D. Albrow
AU - Sun-Ju Chung
AU - Andrew Gould
AU - Youn Kil Jung
AU - Kyu-Ha Hwang
AU - Hongjing Yang
AU - Yossi Shvartzvald
AU - In-Gu Shin
AU - Doeon Kim
AU - Dong-Jin Kim
AU - Byeong-Gon Park
AU - Richard W. Pogge
AU - Qiyue Qian
AU - Yaosong Yu
AU - Yuchen Tang
AU - Yuxin Shang
AU - Tomas Ahumada
AU - imothy Abbott
AU - Guillermo Damke
AU - Konstantina Boutsia
AU - Alfredo Zenteno
AU - Shude Mao
AU - Andong Xu
AU - Przemek Mróz
AU - Michał K. Szymański
AU - Jan Skowron
AU - Radosław Poleski
AU - Igor Soszyński
AU - Paweł Pietrukowicz
AU - Szymon Kozłowski
AU - Krzysztof A. Rybicki
AU - Patryk Iwanek
AU - Krzysztof Ulaczyk
AU - Marcin Wrona
AU - Mariusz Gromadzki
AU - Mateusz J. Mróz
AU - David P. Bennett
AU - Aparna Bhattacharya
AU - Kotaro Daimon
AU - Ryusei Hamada
AU - Yuki Hirao
AU - Shuma Makida
AU - Stela Ishitani Silva
AU - Shota Miyazaki
AU - Tutumi Nagai
AU - Seiya Nakayama
AU - Kansuke Nunota
AU - Ryo Ogawa
AU - Ryunosuke Oishi
AU - Hideaki Ose
AU - Nicholas J. Rattenbury
AU - Yuki K. Satoh
PY - 2026
DA - 2026/09/11
PB - arXiv
DO - 10.48550/arxiv.2609.12451
UR - https://arxiv.org/abs/2609.12451
AB - We present the analysis of the microlensing event KMT-2026-BLG-0083, which was independently detected by the KMTNet, OGLE, and PRIME surveys and also monitored by the DREAMS survey. The combined data provide dense coverage of two distinct short-duration anomalies in the light curve that cannot be reproduced by a standard binary-lens model. Independent analyses of the two anomalies indicate that each is produced by a planetary companion to the lens, motivating a triple-lens interpretation. The modeling yields two pairs of degenerate solutions arising from the well-known inner--outer degeneracy, with each pair exhibiting two local solutions depending on whether the source passes above or below the distant planetary companion. The preferred model indicates two giant planets with mass ratios q_2=(5.25± 0.08)× 10^−3 and q_3=(3.04± 0.24)×10^−3 orbiting a common host. Bayesian analysis indicates that the host is an M-dwarf star with a mass of 0.48^+0.36_−0.28 M_⊙, hosting two giant planets with masses of 2.65^+1.96_−1.55 M_J and 1.54^+1.14_−0.90 M_J. The projected planet--host separations are 10.6^+1.7_−2.2~au and 1.7^+0.3_−0.3~au, placing the inner planet near the host's snow line and the outer planet at a substantially larger separation. Thus, KMT-2026-BLG-0083L becomes the seventh confirmed multiple-planet system discovered through gravitational microlensing, providing another example of a cold giant planetary system orbiting a subsolar-mass star.
ER -