KMT-2024-BLG-3237: Another Free-Floating Planet Candidate with Angular Einstein Radius Measurement
Korea Astronomy and Space Science Institute(韩国天文与空间科学研究院);National University of Science and Technology (UST)(国立科学技术大学);Westlake University(西湖大学);Ohio State University(俄亥俄州立大学);University of Canterbury(坎特伯雷大学);Chungbuk National University(忠北国立大学)
Tanagodchaporn Inyanya, Youn Kil Jung, Hongjing Yang, Kyu-Ha Hwang, Andrew Gould, Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Yoon-Hyun Ryu, In-Gu Shin, Yoss… 展开作者
Tanagodchaporn Inyanya, Youn Kil Jung, Hongjing Yang, Kyu-Ha Hwang, Andrew Gould, Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Yoon-Hyun Ryu, In-Gu Shin, Yossi Shvartzvald, Jennifer C. Yee, Weicheng Zang, Dong-Jin Kim, Chung-Uk Lee, Byeong-Gon Park
Planet formation theories suggest the presence of free-floating planets (FFPs) that are ejected from their formation sites. While these planets emit very little light, they can be identified through gravitational microlensing. Here, we report the discovery of a FFP candidate in the microlensing event KMT-2024-BLG-3237. The observed light curve exhibits strong finite-source effects characterized by a small amplitude $(\lesssim 0.9\,{\rm mag})$ and a short timescale $(\lesssim 3\,{\rm days})$. The analysis yields an Einstein timescale of $t_{\rm E} = 0.54\pm0.02\,{\rm days}$ and an angular Einstein radius of $θ_{\rm E} = 6.30\pm0.48\,μ{\rm as}$. The measurements make it possible to estimate the lens mass as $M \simeq 102\,M_{\oplus}\,(π_{\rm rel}/16\,μ{\rm as})^{-1}$, where $π_{\rm rel}$ is the relative lens-source parallax. Depending on the unknown $π_{\rm rel}$, the lens could be a Neptune-mass planet $(π_{\rm rel} \simeq 0.1\,{\rm mas})$ or a Saturn-mass planet $(π_{\rm rel} \simeq 16\,μ{\rm as})$. A Bayesian analysis yields the lens mass $M = {67.3}_{-42.5}^{+103.2}\,M_{\oplus}$ and the lens distance $D_{\rm L} = {7.34}_{-2.11}^{+0.96}\,{\rm kpc}$. This lens is the eleventh isolated microlens with a measurement of $θ_{\rm E} < 10\,μ{\rm as}$. We find that additional searches for possible signatures of a lens host do not show significant evidence for the host.
KMT-2025-BLG-0975Lb and KMT-2025-BLG-1160Lb: Two Uranus-Mass Planets Beyond the Snow Line Discovered by Microlensing
Chungbuk National University(忠北国立大学);Korea Astronomy and Space Science Institute(韩国天体宇宙科学研究所);University of Warsaw(华沙大学);Ohio State University(俄亥俄州立大学);University of Canterbury(坎特伯雷大学);University of Science and Technology(科学技术大学)
KMT-2024-BLG-0816/OGLE-2024-BLG-0519 -- A Microlensing Event with Candidate Free-Floating Planet Lens and Blended Light
University of Warsaw(华沙大学);Korea Astronomy and Space Science Institute(韩国天文学与空间科学研究所);Westlake University(西湖大学);University of Canterbury(坎特伯雷大学);Max-Planck-Institute for Astronomy(马克斯·普朗克天体物理学研究所);Ohio State University(俄亥俄州立大学);Chungbuk National University(忠北国立大学);National University of Science and Technology (UST)(国立科学技术大学);Weizmann Institute of Science(魏茨曼科学研究所)
Testing KMTNet--PRIME Optical--Near-Infrared Source-Color Constraints in KMT-2024-BLG-0211 and KMT-2024-BLG-1522
The University of Osaka(大阪大学);Massey University(梅西大学);Ohio State University(俄亥俄州立大学);Westlake University(西湖大学);NASA Goddard Space Flight Center(美国宇航局戈达德太空飞行中心);University of Maryland, College Park(马里兰大学帕克分校)
Systematic KMTNet Planetary Anomaly Search. VI. Complete Sample of 2018 Sub-Prime-Field Planets
我们完成了对KMTNet Anomalysis确定的所有2018次主场微透镜行星的分析。在9个先前未发表的行星事件中,有6个明显是行星事件(KMT-2018-BLG-0030,KMT-2018-BLG-0087,KMT-2018-BLG-0247,OGLE-2018-BLG-0298,KMT-2018-BLG-2602和OGLE-2018-BLG-1119),而其余3个在性质上是模糊的。此外,有8个先前公布的次主场行星是由Anomalysts算法选出的。连同一篇关于2018年素场行星的配套论文(Gould et al. 2022),这项工作为基于KMTNet数据中识别的行星的行星质量比函数的首次统计分析奠定了基础。正如预期的那样(Zhu et al. 2014),2018年可能进入质量比分析的行星中有一半(17/33)具有非焦散交叉异常。然而,在5个具有行星-宿主质量比$q<10^{-3}$的非焦散异常中,只有1个是通过肉眼发现的(相比之下,12个具有$q>10^{-3}$的异常中有7个是通过肉眼发现的),这表明了半自动异常搜索的重要性。
KMT-2025-BLG-1314 and KMT-2025-BLG-1392: two microlensing planetary/brown-dwarf candidates analyzed with differentiable code
Tsinghua University(清华大学);Westlake University(西湖大学);Korea Astronomy and Space Science Institute(韩国天文与空间科学研究院);University of Canterbury(坎特伯雷大学);Max-Planck-Institute for Astronomy(马克斯·普朗克天文学研究所);Ohio State University(俄亥俄州立大学);Chungbuk National University(忠北国立大学);National University of Science and Technology (UST)(韩国科学技术院)
Mass Production of 2023 KMTNet Microlensing Planets I: Low Mass Ratio
Korea Astronomy and Space Science Institute(韩国天文与空间科学研究所);Astronomical Observatory, University of Warsaw(华沙大学天文台);Westlake University(西湖大学);Tsinghua University(清华大学);University of Chinese Academy of Sciences(中国科学院大学);Ohio State University(俄亥俄州立大学);University of Canterbury(坎特伯雷大学)
Mass Production of 2023 KMTNet Microlensing Planets. II: Two Planets and A Brown Dwarf
Westlake University(西湖大学);Tsinghua University(清华大学);Korea Astronomy and Space Science Institute(韩国天体宇宙科学研究所);Astronomical Observatory, University of Warsaw(华沙大学天文台);Department of Earth and Space Science, Graduate School of Science, Osaka University(大阪大学理学研究科地球・宇宙科学系);University of Canterbury, School of Physical and Chemical Sciences(坎特伯雷大学物理与化学科学学院)
Limits on a Host Star around a Saturn-mass Free-floating Planet Candidate KMT-2024-BLG-0792/OGLE-2024-BLG-0516
University of Warsaw(华沙大学);École Normale Supérieure, Paris(巴黎高等师范学院);European Southern Observatory(欧洲南方天文台);Peking University(北京大学);National Astronomical Observatories, Chinese Academy of Science(中国科学院国家天文台)
Candidate Microlensing Brown Dwarfs in Binary Lens Systems from the 2023--2025 Observing Seasons
Chungbuk National University(忠北国立大学);University of Warsaw(华沙大学);Massey University(梅西大学);Korea Astronomy and Space Science Institute(韩国天文学与空间科学研究所);University of Canterbury(坎特伯雷大学);Ohio State University(俄亥俄州立大学);University of Science and Technology(科学技术大学)
KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS
Westlake Institute for Advanced Study(西湖高等研究院);Westlake University(西湖大学);Korea Astronomy and Space Science Institute(韩国天文与空间科学研究所);The University of Osaka(大阪大学);Tsinghua University(清华大学);Chungbuk National University(忠北国立大学)
Four Cold Super-Jupiters Revealed by Extended and Complex Microlensing Signals
Chungbuk National University(忠北国立大学);Korea Astronomy and Space Science Institute(韩国天文与空间科学研究所);University of Canterbury(坎特伯雷大学);Ohio State University(俄亥俄州立大学);University of Science and Technology(科学技术联合大学院大学);Weizmann Institute of Science(魏茨曼科学研究所)
Two Low-Mass-Ratio Microlensing Planets from High-Magnification Events: KMT-2021-BLG-0247 and MOA-2023-BLG-169
The University of Osaka(大阪大学);Ohio State University(俄亥俄州立大学);Massey University(梅西大学);Università di Salerno(萨莱诺大学);Istituto Nazionale di Fisica Nucleare(意大利国家核物理研究所);Nagoya University(名古屋大学);NASA Goddard Space Flight Center(NASA戈达德太空飞行中心);University of Maryland, College Park(马里兰大学帕克分校)