{"paper":{"title":"Microlensing Discovery of a Population of Very Tight, Very Low-mass Binary Brown Dwarfs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"A. A. Cole, A. Cassan, A. Fukui, A. Gould, A. Hornstrup, A. Udalski, B.-G. Park, B. S. Gaudi, C. B. Henderson, C. Coutures, C. Han, C. H. Ling, C. Liebig, C. S. Botzler, C. Snodgrass, C.-U. Lee, D. Dominis Prester, D. J. Sullivan, D. Kubas, D. L. DePoy, D. Maoz, D. M. Bramich, D. McGregor, D. P. Bennett, D. Ricci, D. Suzuki, E. Bachelet, E. Gorbikov, E. Kerins, F. Abe, F. Finet, F. Grundahl, F. Jablonski, F. Zimmer, G. Maier, G. Pietrzy\\'nski, G. Scarpetta, H. Park, I. A. Bond, I. A. Steele, I.-G. Shin, I. Soszy\\'nski, J. A. Munoz, J.-B. Marquette, J. C. Yee, J. Donatowicz, J. Greenhill, J. Janczak, J. Jessen-Hansen, J.-P. Beaulieu, J. Skottfelt, J. Skowron, J. Southworth, J. Surdej, J. Tregloan-Reed, J. Wambsganss, J. W. Menzies, J.-Y. Choi, K. A. Alsubai, K. C. Sahu, K. Furusawa, K. Harps{\\o}e, K.-H. Hwang, K. Horne, K. Masuda, K. Ohnishi, K. Suzuki, K. Ulaczyk, K. Wada, L. A. Almeida, L. Mancini, \\L. Wyrzykowski, M. D. Albrow, M. Dominik, M. Freeman, M. Glitrup, M. Hundertmark, M. J. Burgdorf, M. K. Szyma\\'nski, M. Kubiak, M. Lundkvist, M. Mathiasen, M. N. Lund, M. T. Penny, M. Zub, N. J. Rattenbury, N. Kains, N. Miyake, O. Wertz, P. Browne, P. Chote, P. C. M. Yock, P. Dodds, P. Fouqu\\'e, P. J. Tristram, P. Pietrukowicz, R. A. Street, R. Poleski, R. W. Pogge, S. Brillant, S. Calchi Novati, S. Dieters, S. Hardis, S.-H. Gu, S. Kaspi, S. Koz{\\l}owski, S. Rahvar, S. Takino, Subo Dong, T. C. Hinse, To. Saito, T. Sumi, U. G. J{\\o}rgensen, U. Malamud, V. Batista, V. Bozza, W. L. Sweatman, X.-S. Fang, Y. Itow, Y.-K. Jung, Y. Matsubara, Y. Muraki, Y. Shvartzvald, Y. Tsapras","submitted_at":"2013-02-18T07:15:37Z","abstract_excerpt":"Although many models have been proposed, the physical mechanisms responsible for the formation of low-mass brown dwarfs are poorly understood. The multiplicity properties and minimum mass of the brown-dwarf mass function provide critical empirical diagnostics of these mechanisms. We present the discovery via gravitational microlensing of two very low-mass, very tight binary systems. These binaries have directly and precisely measured total system masses of 0.025 Msun and 0.034 Msun, and projected separations of 0.31 AU and 0.19 AU, making them the lowest-mass and tightest field brown-dwarf bin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.4169","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}