{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T17:27:47Z","timestamp":1792085267378,"version":"4.4.0"},"reference-count":87,"publisher":"American Association for the Advancement of Science (AAAS)","issue":"6780","funder":[{"DOI":"10.13039\/501100000271","name":"Science and Technology Facilities Council","doi-asserted-by":"publisher","award":["ST\/S000623\/1"],"award-info":[{"award-number":["ST\/S000623\/1"]}],"id":[{"id":"10.13039\/501100000271","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.science.org"],"crossmark-restriction":true},"short-container-title":["Science"],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:p>\n                    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\u2014KMT-2024-BLG-0792\/OGLE-2024-BLG-0516, which was observed from both ground- and space-based telescopes\u2014that breaks the mass-distance degeneracy. The event was caused by an object with\n                    <jats:inline-formula>\n                      <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\" overflow=\"scroll\">\n                        <mml:mrow>\n                          <mml:msubsup>\n                            <mml:mrow>\n                              <mml:mn>0.219<\/mml:mn>\n                            <\/mml:mrow>\n                            <mml:mrow>\n                              <mml:mo>\u2212<\/mml:mo>\n                              <mml:mn>0.046<\/mml:mn>\n                            <\/mml:mrow>\n                            <mml:mrow>\n                              <mml:mo>+<\/mml:mo>\n                              <mml:mn>0.075<\/mml:mn>\n                            <\/mml:mrow>\n                          <\/mml:msubsup>\n                        <\/mml:mrow>\n                      <\/mml:math>\n                    <\/jats:inline-formula>\n                    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). Dynamical processes then ejected it from its birthplace, producing a free-floating object.\n                  <\/jats:p>","DOI":"10.1126\/science.adv9266","type":"journal-article","created":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T19:02:57Z","timestamp":1767294177000},"page":"96-99","update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":7,"title":["A free-floating-planet microlensing event caused by a Saturn-mass object"],"prefix":"10.1126","volume":"391","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1027-0990","authenticated-orcid":true,"given":"Subo","family":"Dong","sequence":"first","affiliation":[{"name":"Department of Astronomy, School of Physics, Peking University, Beijing, China."},{"name":"Kavli Institute of Astronomy and Astrophysics, Peking University, Beijing, China."},{"name":"National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-5754-6206","authenticated-orcid":true,"given":"Zexuan","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Astronomy, School of Physics, Peking University, Beijing, China."},{"name":"Kavli Institute of Astronomy and Astrophysics, Peking University, Beijing, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9823-2907","authenticated-orcid":true,"given":"Yoon-Hyun","family":"Ryu","sequence":"additional","affiliation":[{"name":"Korea Astronomy and Space Science Institute, Daejeon, Republic of Korea."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5207-5619","authenticated-orcid":true,"given":"Andrzej","family":"Udalski","sequence":"additional","affiliation":[{"name":"Astronomical Observatory, University of Warsaw, Warszawa, 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