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arXiv 2602.22709astro-ph.EPastro-ph.GA
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KMT-2024-BLG-3237:另一个具有角爱因斯坦半径测量的自由漂浮行星候选体

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

AI总结:

KMT-2024-BLG-3237发现一个自由漂浮行星候选体,通过引力透镜效应测量角爱因斯坦半径,推测其质量可能为海王星或土星质量。

摘要:

行星形成理论推测存在被弹射出形成位置的自由漂浮行星(FFPs)。尽管这些行星发出的光非常微弱,但可以通过引力透镜效应进行识别。在这里,我们报告了在微透镜事件KMT-2024-BLG-3237中发现一个FFPs候选体。观测到的光曲线表现出强烈的有限源效应,特征为小幅度(<0.9 magnitudes)和短时间尺度(<3天)。分析得出爱因斯坦时间尺度为t_E = 0.54±0.02天和角爱因斯坦半径θ_E = 6.30±0.48μas。这些测量使能够估计透镜质量为M ≈ 102M_⊕(π_rel/16μas)^{-1},其中π_rel是相对透镜-源视差。根据未知的π_rel,透镜可能是海王星质量的行星(π_rel ≈ 0.1mas)或土星质量的行星(π_rel ≈ 16μas)。贝叶斯分析得出透镜质量M = 67.3_{-42.5}^{+103.2}M_⊕和透镜距离D_L = 7.34_{-2.11}^{+0.96}kpc。这个透镜是第十一颗具有θ_E < 10μas测量的孤立透镜。我们发现额外搜索可能的透镜宿主迹象未显示显著证据。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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