KMT-2021-BLG-0912Lb：一颗绕 K 型恒星的微引力透镜超级地球
地球与行星天体物理
2022-02-16 v1 星系天体物理
摘要
微引力透镜事件 KMT-2021-BLG-0912 的光变曲线相对于单透镜单源形式表现出极短的异常。我们研究该光变曲线以确认异常起源。我们在多种解释下对光变曲线建模。由此得到四组解，其中三组解基于透镜由两质量组成（2L1S 模型）的假设，另一组解基于源为双星系统（1L2S 模型）的假设。1L2S 模型因暗源伴星大于其主星这一矛盾而被排除，且一组 2L1S 解因拟合相对较差、混合约束及较低总概率的组合而被排除，留下两组存活解，其行星/宿主质量比分别为 与 。一处细微的中心偏离支持第三透镜分量存在的可能性，即要么是分离极大或极小的宿主伴星，要么是位于爱因斯坦环附近的第二颗行星，但由于拟合改善边际、不同数据集间缺乏一致性，以及难以唯一确定第三分量的性质，难以断言可靠探测。由事件可观测量估计，依一组解行星与宿主质量约为 ，依另一组解约为 ，表明无论哪组解该行星均为绕 K 型恒星的超级地球。
引用
@article{arxiv.2111.04861,
title = {KMT-2021-BLG-0912Lb: A microlensing super Earth around a K-type star},
author = {Cheongho Han and Ian A. Bond and Jennifer C. Yee and Weicheng Zang and Michael D. Albrow and Sun-Ju Chung and Andrew P. Gould and Kyu-Ha Hwang and Youn Kil Jung and Doeon Kim and Chung-Uk Lee and Yoon-Hyun Ryu and In-Gu Shin and Yossi Shvartzvald and Sang-Mok Cha and Dong-Jin Kim and Seung-Lee Kim and Dong-Joo Lee and Yongseok Lee and Byeong-Gon Park and Richard W. Pogge and Fumio Abe and Richard Barry and David P. Bennett and Aparna Bhattacharya and Yuki Hirao and Hirosane Fujii and Akihiko Fukui and Yoshitaka Itow and Rintaro Kirikawa and Iona Kondo and Naoki Koshimoto and Yutaka Matsubara and Sho Matsumoto and Yasushi Muraki and Shota Miyazaki and Clément Ranc and Arisa Okamura and Nicholas J. Rattenbury and Yuki Satoh and Takahiro Sumi and Daisuke Suzuki and Stela Ishitani Silva and Taiga Toda and Paul J. Tristram and Hibiki Yama and Atsunori Yonehara and Tony Cooper and Plamen Dimitrov and Subo Dong and John Drummond and Jonathan Green and Steve Hennerley and Zhuokai Liu and Shude Mao and Dan Maoz and Matthew Penny and Hongjing Yang},
journal= {arXiv preprint arXiv:2111.04861},
year = {2022}
}
备注
11 pages, 10 figures, 7 tables