KMT-2023-BLG-2669: Ninth Free-floating Planet Candidate with $θ_{\rm E}$ measurements
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2024
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| author | Jung, Youn Kil Hwang, Kyu-Ha Yang, Hongjing Gould, Andrew Yee, Jennifer C. Han, Cheongho Albrow, Michael D. Chung, Sun-Ju Ryu, Yoon-Hyun Shin, In-Gu Shvartzvald, Yossi Zang, Weicheng Cha, Sang-Mok Kim, Dong-Jin Kim, Seung-Lee Lee, Chung-Uk Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. |
| author_facet | Jung, Youn Kil Hwang, Kyu-Ha Yang, Hongjing Gould, Andrew Yee, Jennifer C. Han, Cheongho Albrow, Michael D. Chung, Sun-Ju Ryu, Yoon-Hyun Shin, In-Gu Shvartzvald, Yossi Zang, Weicheng Cha, Sang-Mok Kim, Dong-Jin Kim, Seung-Lee Lee, Chung-Uk Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. |
| contents | We report a free-floating planet (FFP) candidate identified from the analysis of the microlensing event KMT-2023-BLG-2669. The lensing light curve is characterized by a short duration $(\lesssim 3\,{\rm days})$ and a small amplitude $(\lesssim 0.7\,{\rm mag})$. From the analysis, we find the Einstein timescale of $t_{\rm E} \backsimeq 0.33\,{\rm days}$ and the Einstein radius of $θ_{\rm E} \backsimeq 4.41\,μ{\rm as}$. These measurements enable us to infer the lens mass as $M = 8\,M_{\oplus} (π_{\rm rel} / 0.1\,{\rm mas})^{-1}$, where $π_{\rm rel}$ is the relative lens-source parallax. The inference implies that the lens is a sub-Neptune- to Saturn-mass object depending on its unknown distance. This is the ninth isolated planetary-mass microlens with $θ_{\rm E} < 10\,μ{\rm as}$, which (as shown by \citealt{gould22}) is a useful threshold for a FFP candidate. We conduct extensive searches for possible signals of a host star in the light curve, but find no strong evidence for the host. We investigate the possibility of using late-time high-resolution imaging to probe for possible hosts. In particular, we discuss that for the case of finite-source point-lens FFP candidates, it would be possible to search for very wide separation hosts immediately, although such searches are "high-risk, high-reward". |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_16857 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | KMT-2023-BLG-2669: Ninth Free-floating Planet Candidate with $θ_{\rm E}$ measurements Jung, Youn Kil Hwang, Kyu-Ha Yang, Hongjing Gould, Andrew Yee, Jennifer C. Han, Cheongho Albrow, Michael D. Chung, Sun-Ju Ryu, Yoon-Hyun Shin, In-Gu Shvartzvald, Yossi Zang, Weicheng Cha, Sang-Mok Kim, Dong-Jin Kim, Seung-Lee Lee, Chung-Uk Lee, Dong-Joo Lee, Yongseok Park, Byeong-Gon Pogge, Richard W. Earth and Planetary Astrophysics Astrophysics of Galaxies We report a free-floating planet (FFP) candidate identified from the analysis of the microlensing event KMT-2023-BLG-2669. The lensing light curve is characterized by a short duration $(\lesssim 3\,{\rm days})$ and a small amplitude $(\lesssim 0.7\,{\rm mag})$. From the analysis, we find the Einstein timescale of $t_{\rm E} \backsimeq 0.33\,{\rm days}$ and the Einstein radius of $θ_{\rm E} \backsimeq 4.41\,μ{\rm as}$. These measurements enable us to infer the lens mass as $M = 8\,M_{\oplus} (π_{\rm rel} / 0.1\,{\rm mas})^{-1}$, where $π_{\rm rel}$ is the relative lens-source parallax. The inference implies that the lens is a sub-Neptune- to Saturn-mass object depending on its unknown distance. This is the ninth isolated planetary-mass microlens with $θ_{\rm E} < 10\,μ{\rm as}$, which (as shown by \citealt{gould22}) is a useful threshold for a FFP candidate. We conduct extensive searches for possible signals of a host star in the light curve, but find no strong evidence for the host. We investigate the possibility of using late-time high-resolution imaging to probe for possible hosts. In particular, we discuss that for the case of finite-source point-lens FFP candidates, it would be possible to search for very wide separation hosts immediately, although such searches are "high-risk, high-reward". |
| title | KMT-2023-BLG-2669: Ninth Free-floating Planet Candidate with $θ_{\rm E}$ measurements |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2405.16857 |