Testing KMTNet--PRIME Optical--Near-Infrared Source-Color Constraints in KMT-2024-BLG-0211 and KMT-2024-BLG-1522
Abstract
We present analyses of two 2024 microlensing events, KMT-2024-BLG-0211 and KMT-2024-BLG-1522, jointly observed by KMTNet in the optical and PRIME in the near-infrared. For KMT-2024-BLG-0211, the KMTNet--PRIME I−H color provides a useful constraint on the angular source radius for a short-timescale finite-source event with a giant source. The event is consistent with a low-mass stellar lens, although the weak parallax constraint leaves the lens mass and distance uncertain. For KMT-2024-BLG-1522, we compare the results obtained from V−I, I−H, V−H, and J−H color constraints. The microlensing parameters are nearly identical among the four analyses, yielding a robust binary-lens solution with nearly equal masses. However, the inferred source properties and lens physical parameters depend on the adopted source color because the different color estimates imply different angular source radii. Comparing the (V−I)KMT versus (I−H)KMT,PRIME plane shows that the inferred source colors lie off empirical color--color relations but within the scatter of observed stars. The prevalence of such deviations should be tested with a larger sample of KMTNet--PRIME events and this specific case can be further tested with future adaptive-optics follow-up, which can directly measure the lens--source relative proper motion and lens flux.
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BibTeX
@misc{nunota2026testing,
title = {{Testing KMTNet--PRIME Optical--Near-Infrared Source-Color Constraints in KMT-2024-BLG-0211 and KMT-2024-BLG-1522}},
author = {Kansuke Nunota and Jennifer C. Yee and Takahiro Sumi and Ryusei Hamada and Ian A. Bond and Andrew Gould and Weicheng Zang and David P. Bennett and Aparna Bhattacharya and Kotaro Daimon and Yuki Hirao and Stela Ishitani Silva and Shuma Makida and Shota Miyazaki and Tutumi Nagai and Seiya Nakayama and Ryo Ogawa and Ryunosuke Oishi and Hideaki Ose and Nicholas J. Rattenbury and Yuki K. Satoh and Daisuke Suzuki and Takuto Tamaoki and Motohide Tamura and Sean K. Terry and Chihiro Ueda and Aikaterini Vandorou and Hibiki Yama and Michael D. Albrow and Sun-Ju Chung and Cheongho Han and Kyu-Ha Hwang and Youn Kil Jung and Yoon-Hyun Ryu and In-Gu Shin and Yossi Shvartzvald and Hongjing Yang and Dong-Jin Kim and Chung-Uk Lee and Byeong-Gon Park},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.36768},
eprint = {2609.36768},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.36768},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Testing KMTNet--PRIME Optical--Near-Infrared Source-Color Constraints in KMT-2024-BLG-0211 and KMT-2024-BLG-1522
AU - Kansuke Nunota
AU - Jennifer C. Yee
AU - Takahiro Sumi
AU - Ryusei Hamada
AU - Ian A. Bond
AU - Andrew Gould
AU - Weicheng Zang
AU - David P. Bennett
AU - Aparna Bhattacharya
AU - Kotaro Daimon
AU - Yuki Hirao
AU - Stela Ishitani Silva
AU - Shuma Makida
AU - Shota Miyazaki
AU - Tutumi Nagai
AU - Seiya Nakayama
AU - Ryo Ogawa
AU - Ryunosuke Oishi
AU - Hideaki Ose
AU - Nicholas J. Rattenbury
AU - Yuki K. Satoh
AU - Daisuke Suzuki
AU - Takuto Tamaoki
AU - Motohide Tamura
AU - Sean K. Terry
AU - Chihiro Ueda
AU - Aikaterini Vandorou
AU - Hibiki Yama
AU - Michael D. Albrow
AU - Sun-Ju Chung
AU - Cheongho Han
AU - Kyu-Ha Hwang
AU - Youn Kil Jung
AU - Yoon-Hyun Ryu
AU - In-Gu Shin
AU - Yossi Shvartzvald
AU - Hongjing Yang
AU - Dong-Jin Kim
AU - Chung-Uk Lee
AU - Byeong-Gon Park
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2609.36768
UR - https://arxiv.org/abs/2609.36768
AB - We present analyses of two 2024 microlensing events, KMT-2024-BLG-0211 and KMT-2024-BLG-1522, jointly observed by KMTNet in the optical and PRIME in the near-infrared. For KMT-2024-BLG-0211, the KMTNet--PRIME I−H color provides a useful constraint on the angular source radius for a short-timescale finite-source event with a giant source. The event is consistent with a low-mass stellar lens, although the weak parallax constraint leaves the lens mass and distance uncertain. For KMT-2024-BLG-1522, we compare the results obtained from V−I, I−H, V−H, and J−H color constraints. The microlensing parameters are nearly identical among the four analyses, yielding a robust binary-lens solution with nearly equal masses. However, the inferred source properties and lens physical parameters depend on the adopted source color because the different color estimates imply different angular source radii. Comparing the (V−I)_KMT versus (I−H)_KMT,PRIME plane shows that the inferred source colors lie off empirical color--color relations but within the scatter of observed stars. The prevalence of such deviations should be tested with a larger sample of KMTNet--PRIME events and this specific case can be further tested with future adaptive-optics follow-up, which can directly measure the lens--source relative proper motion and lens flux.
ER -