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The light curves show weak binary-lens perturbations, complicating the analysis, but the joint modeling with the VLTI data breaks several degeneracies, arriving at a strongly favored solution. Thanks to precise measurements of the angular Einstein radius <jats:italic>\u03b8<\/jats:italic>\n                  <jats:sub>E<\/jats:sub> = 0.724 \u00b1 0.002 mas and microlens parallax, we determine that the lens system consists of two M dwarfs with masses of <jats:italic>M<\/jats:italic>\n                  <jats:sub>1<\/jats:sub> = 0.258 \u00b1 0.008 <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2299<\/jats:sub> and <jats:italic>M<\/jats:italic>\n                  <jats:sub>2<\/jats:sub> = 0.130 \u00b1 0.007 <jats:italic>M<\/jats:italic>\n                  <jats:sub>\u2299<\/jats:sub>, a projected separation of <jats:italic>r<\/jats:italic>\n                  <jats:sub>\u22a5<\/jats:sub> = 6.83 \u00b1 0.31 au, and a distance of <jats:italic>D<\/jats:italic>\n                  <jats:sub>L<\/jats:sub> = 2.29 \u00b1 0.08 kpc. The successful VLTI observations of ASASSN-22av open up a new path for studying intermediate-separation (i.e., a few astronomical units) stellar-mass binaries, including those containing dark compact objects such as neutron stars and stellar-mass black holes.<\/jats:p>","DOI":"10.3847\/1538-4357\/ad90b9","type":"journal-article","created":{"date-parts":[[2024,12,17]],"date-time":"2024-12-17T15:10:23Z","timestamp":1734448223000},"page":"229","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["First Resolution of Microlensed Images of a Binary-lens Event"],"prefix":"10.3847","volume":"977","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-5754-6206","authenticated-orcid":true,"given":"Zexuan","family":"Wu","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1027-0990","authenticated-orcid":true,"given":"Subo","family":"Dong","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2125-0183","authenticated-orcid":true,"given":"A.","family":"M\u00e9rand","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6017-2961","authenticated-orcid":true,"given":"Christopher S.","family":"Kochanek","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7016-1692","authenticated-orcid":true,"given":"Przemek","family":"Mr\u00f3z","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4569-9009","authenticated-orcid":true,"given":"Jinyi","family":"Shangguan","sequence":"additional","affiliation":[]},{"given":"Grant","family":"Christie","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5603-6895","authenticated-orcid":true,"given":"Thiam-Guan","family":"Tan","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3978-1409","authenticated-orcid":false,"given":"Thomas","family":"Bensby","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7516-4016","authenticated-orcid":true,"given":"Joss","family":"Bland-Hawthorn","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4031-8553","authenticated-orcid":true,"given":"Sven","family":"Buder","sequence":"additional","affiliation":[]},{"given":"Frank","family":"Eisenhauer","sequence":"additional","affiliation":[]},{"given":"Andrew P.","family":"Gould","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2533-6056","authenticated-orcid":false,"given":"Janez","family":"Kos","sequence":"additional","affiliation":[]},{"given":"Tim","family":"Natusch","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0920-809X","authenticated-orcid":true,"given":"Sanjib","family":"Sharma","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5207-5619","authenticated-orcid":true,"given":"Andrzej","family":"Udalski","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2958-4738","authenticated-orcid":true,"given":"J.","family":"Woillez","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7004-9956","authenticated-orcid":true,"given":"David A. 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