A free-floating-planet microlensing event caused by a Saturn-mass object
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909979697479680 |
|---|---|
| author | Dong, Subo Wu, Zexuan Ryu, Yoon-Hyun Udalski, Andrzej Mroz, Przemek Rybicki, Krzysztof A. Hodgkin, Simon T. Wyrzykowski, Lukasz Eyer, Laurent Bensby, Thomas Chen, Ping Wang, Sharon X. Gould, Andrew Yang, Hongjing Albrow, Michael D. Chung, Sun-Ju Han, Cheongho Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yee, Jennifer C. Zang, Weicheng Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon Poleski, Radoslaw Skowron, Jan Szymanski, Michal K. Soszynski, Igor Pietrukowicz, Pawel Kozlowski, Szymon Skowron, Dorota M. Ulaczyk, Krzysztof Gromadzki, Mariusz Ratajczak, Milena Iwanek, Patryk Wrona, Marcin Mroz, Mateusz J. Rixon, Guy Harrison, Diana L. Breedt, Elme |
| author_facet | Dong, Subo Wu, Zexuan Ryu, Yoon-Hyun Udalski, Andrzej Mroz, Przemek Rybicki, Krzysztof A. Hodgkin, Simon T. Wyrzykowski, Lukasz Eyer, Laurent Bensby, Thomas Chen, Ping Wang, Sharon X. Gould, Andrew Yang, Hongjing Albrow, Michael D. Chung, Sun-Ju Han, Cheongho Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yee, Jennifer C. Zang, Weicheng Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon Poleski, Radoslaw Skowron, Jan Szymanski, Michal K. Soszynski, Igor Pietrukowicz, Pawel Kozlowski, Szymon Skowron, Dorota M. Ulaczyk, Krzysztof Gromadzki, Mariusz Ratajczak, Milena Iwanek, Patryk Wrona, Marcin Mroz, Mateusz J. Rixon, Guy Harrison, Diana L. Breedt, Elme |
| contents | A population of free-floating planets is known from gravitational microlensing surveys. None have a directly measured mass, owing to a degeneracy with the distance, but the population statistics indicate that many are less massive than Jupiter. We report a microlensing event -- KMT-2024-BLG-0792/OGLE-2024-BLG-0516, which was observed from both ground- and space-based telescopes -- that breaks the mass-distance degeneracy. The event was caused by an object with 0.219^{+0.075}_{-0.046} Jupiter masses that is either gravitationally unbound or on a very wide orbit. Through comparison with the statistical properties of other observed microlensing events and predictions from simulations, we infer that this object likely formed in a protoplanetary disk (like a planet), not in isolation (like a brown dwarf), and dynamical processes then ejected it from its birth place, producing a free-floating object. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00057 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A free-floating-planet microlensing event caused by a Saturn-mass object Dong, Subo Wu, Zexuan Ryu, Yoon-Hyun Udalski, Andrzej Mroz, Przemek Rybicki, Krzysztof A. Hodgkin, Simon T. Wyrzykowski, Lukasz Eyer, Laurent Bensby, Thomas Chen, Ping Wang, Sharon X. Gould, Andrew Yang, Hongjing Albrow, Michael D. Chung, Sun-Ju Han, Cheongho Hwang, Kyu-Ha Jung, Youn Kil Shin, In-Gu Shvartzvald, Yossi Yee, Jennifer C. Zang, Weicheng Kim, Dong-Jin Lee, Chung-Uk Park, Byeong-Gon Poleski, Radoslaw Skowron, Jan Szymanski, Michal K. Soszynski, Igor Pietrukowicz, Pawel Kozlowski, Szymon Skowron, Dorota M. Ulaczyk, Krzysztof Gromadzki, Mariusz Ratajczak, Milena Iwanek, Patryk Wrona, Marcin Mroz, Mateusz J. Rixon, Guy Harrison, Diana L. Breedt, Elme Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics A population of free-floating planets is known from gravitational microlensing surveys. None have a directly measured mass, owing to a degeneracy with the distance, but the population statistics indicate that many are less massive than Jupiter. We report a microlensing event -- KMT-2024-BLG-0792/OGLE-2024-BLG-0516, which was observed from both ground- and space-based telescopes -- that breaks the mass-distance degeneracy. The event was caused by an object with 0.219^{+0.075}_{-0.046} Jupiter masses that is either gravitationally unbound or on a very wide orbit. Through comparison with the statistical properties of other observed microlensing events and predictions from simulations, we infer that this object likely formed in a protoplanetary disk (like a planet), not in isolation (like a brown dwarf), and dynamical processes then ejected it from its birth place, producing a free-floating object. |
| title | A free-floating-planet microlensing event caused by a Saturn-mass object |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2601.00057 |