KMT-2023-BLG-1431Lb: A New q < 10−4 Microlensing Planet from a Subtle Signature

IF 3.3 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Publications of the Astronomical Society of the Pacific Pub Date : 2024-05-27 DOI:10.1088/1538-3873/ad48b8

Aislyn Bell, Jiyuan Zhang, Weicheng Zang, Youn Kil Jung, Jennifer C. Yee, Hongjing Yang, Takahiro Sumi, Andrzej Udalski, Leading Authors, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Cheongho Han, Kyu-Ha Hwang, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, The KMTNet Collaboration, Yunyi Tang, Jennie McCormick, Subo Dong, Zhuokai Liu, Leandro de Almeida, Shude Mao, Dan Maoz, Wei Zhu, The MAP & FUN Follow-up Team, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Ian A. Bond, Hirosane Fujii, Akihiko Fukui, Ryusei Hamada, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Naoki Koshimoto, Yutaka Matsubara, Sho Matsumoto, Shota Miyazaki, Yasushi Muraki, Arisa Okamura, Greg Lmschenk, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Daisuke Suzuki, Taiga Toda, Mio Tomoyoshi, Paul J. Tristram, Aikaterini Vandorou, Hib..

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Abstract

The current studies of microlensing planets are limited by small number statistics. Follow-up observations of high-magnification microlensing events can efficiently form a statistical planetary sample. Since 2020, the Korea Microlensing Telescope Network (KMTNet) and the Las Cumbres Observatory (LCO) global network have been conducting a follow-up program for high-magnification KMTNet events. Here, we report the detection and analysis of a microlensing planetary event, KMT-2023-BLG-1431, for which the subtle (0.05 mag) and short-lived (5 hr) planetary signature was characterized by the follow-up from KMTNet and LCO. A binary-lens single-source (2L1S) analysis reveals a planet/host mass ratio of q = (0.72 ± 0.07) × 10−4, and the single-lens binary-source (1L2S) model is excluded by Δχ2 = 80. A Bayesian analysis using a Galactic model yields estimates of the host star mass of , the planetary mass of , and the lens distance of kpc. The projected planet-host separation of au or au, subject to the close/wide degeneracy. We also find that without the follow-up data, the survey-only data cannot break the degeneracy of central/resonant caustics and the degeneracy of 2L1S/1L2S models, showing the importance of follow-up observations for current microlensing surveys.

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KMT-2023-BLG-1431Lb：从微妙特征中发现一颗新的 q < 10-4 微透镜行星

目前对微透镜行星的研究受到小数量统计的限制。对高倍率微透镜事件的跟踪观测可以有效地形成行星统计样本。自2020年起，韩国微透镜望远镜网络（KMTNet）和拉斯坎布雷斯天文台（LCO）全球网络开始对高倍率KMTNet事件进行跟踪观测。在此，我们报告了对微透镜行星事件KMT-2023-BLG-1431的探测和分析，KMTNet和LCO的跟进工作确定了该事件微妙（0.05等）和短暂（5小时）的行星特征。双透镜单源（2L1S）分析显示行星/宿主质量比为 q = (0.72 ± 0.07) × 10-4，而单透镜双源（1L2S）模型因 Δχ2 = 80 而被排除。利用银河系模型进行贝叶斯分析后，估计主星质量为，行星质量为，透镜距离为 kpc。根据近/远退化关系，预计行星与宿主的距离为 au 或 au。我们还发现，如果没有后续数据，仅有的巡天数据无法打破中心/共振凹陷的退行性和 2L1S/1L2S 模型的退行性，这显示了后续观测对于当前微透镜巡天的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理

CiteScore

6.70

自引率

5.70%

发文量

103

审稿时长

4-8 weeks

期刊介绍： The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.