December
2012
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2012ApJ...760..116S
Authors
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Shin, I. -G.
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Han, C.
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Gould, A.
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Udalski, A.
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Sumi, T.
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Dominik, M.
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Beaulieu, J. -P.
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Tsapras, Y.
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Bozza, V.
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Szymański, M. K.
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Kubiak, M.
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Soszyński, I.
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Pietrzyński, G.
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Poleski, R.
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Ulaczyk, K.
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Pietrukowicz, P.
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Kozłowski, S.
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Skowron, J.
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Wyrzykowski, Ł.
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OGLE Collaboration
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Abe, F.
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Bennett, D. P.
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Bond, I. A.
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Botzler, C. S.
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Freeman, M.
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Fukui, A.
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Furusawa, K.
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Hayashi, F.
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Hearnshaw, J. B.
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Hosaka, S.
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Itow, Y.
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Kamiya, K.
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Kilmartin, P. M.
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Kobara, S.
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Korpela, A.
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Lin, W.
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Ling, C. H.
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Makita, S.
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Masuda, K.
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Matsubara, Y.
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Miyake, N.
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Muraki, Y.
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Nagaya, M.
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Nishimoto, K.
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Ohnishi, K.
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Okumura, T.
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Omori, K.
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Perrott, Y. C.
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Rattenbury, N.
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Saito, To.
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Skuljan, L.
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Sullivan, D. J.
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Suzuki, D.
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Sweatman, W. L.
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Tristram, P. J.
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Wada, K.
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Yock, P. C. M.
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MOA Collaboration
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Christie, G. W.
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Depoy, D. L.
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Dong, S.
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Gal-Yam, A.
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Gaudi, B. S.
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Hung, L. -W.
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Janczak, J.
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Kaspi, S.
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Maoz, D.
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McCormick, J.
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McGregor, D.
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Moorhouse, D.
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Muñoz, J. A.
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Natusch, T.
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Nelson, C.
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Pogge, R. W.
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Tan, T. -G.
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Polishook, D.
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Shvartzvald, Y.
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Shporer, A.
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Thornley, G.
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Malamud, U.
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Yee, J. C.
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Choi, J. -Y.
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Jung, Y. -K.
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Park, H.
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Lee, C. -U.
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Park, B. -G.
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Koo, J. -R.
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μFUN Collaboration
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Bajek, D.
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Bramich, D. M.
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Browne, P.
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Horne, K.
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Ipatov, S.
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Snodgrass, C.
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Steele, I.
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Street, R.
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Alsubai, K. A.
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Burgdorf, M. J.
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Calchi Novati, S.
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Dodds, P.
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Dreizler, S.
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Fang, X. -S.
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Grundahl, F.
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Gu, C. -H.
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Hardis, S.
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Harpsøe, K.
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Hinse, T. C.
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Hundertmark, M.
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Jessen-Hansen, J.
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Jørgensen, U. G.
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Kains, N.
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Kerins, E.
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Liebig, C.
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Lund, M.
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Lundkvist, M.
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Mancini, L.
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Mathiasen, M.
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Hornstrup, A.
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Penny, M. T.
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Proft, S.
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Rahvar, S.
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Ricci, D.
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Scarpetta, G.
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Skottfelt, J.
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Southworth, J.
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Surdej, J.
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Tregloan-Reed, J.
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Wertz, O.
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Zimmer, F.
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Albrow, M. D.
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Batista, V.
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Brillant, S.
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Caldwell, J. A. R.
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Calitz, J. J.
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Cassan, A.
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Cole, A.
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Cook, K. H.
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Corrales, E.
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Coutures, Ch.
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Dieters, S.
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Dominis Prester, D.
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Donatowicz, J.
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Fouqué, P.
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Greenhill, J.
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Hill, K.
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Hoffman, M.
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Kane, S. R.
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Kubas, D.
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Marquette, J. -B.
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Martin, R.
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Meintjes, P.
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Menzies, J.
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Pollard, K. R.
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Sahu, K. C.
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Wambsganss, J.
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Williams, A.
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Vinter, C.
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Zub, M.
Abstract
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Brown dwarfs are important objects because they may provide a missing link between stars and planets, two populations that have dramatically different formation histories. In this paper, we present the candidate binaries with brown dwarf companions that are found by analyzing binary microlensing events discovered during the 2004-2011 observation seasons. Based on the low mass ratio criterion of q < 0.2, we found seven candidate events: OGLE-2004-BLG-035, OGLE-2004-BLG-039, OGLE-2007-BLG-006, OGLE-2007-BLG-399/MOA-2007-BLG-334, MOA-2011-BLG-104/OGLE-2011-BLG-0172, MOA-2011-BLG-149, and MOA-201-BLG-278/OGLE-2011-BLG-012N. Among them, we are able to confirm that the companions of the lenses of MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149 are brown dwarfs by determining the mass of the lens based on the simultaneous measurement of the Einstein radius and the lens parallax. The measured masses of the brown dwarf companions are 0.02 ± 0.01 M ⊙ and 0.019 ± 0.002 M ⊙ for MOA-2011-BLG-104/OGLE-2011-BLG-0172 and MOA-2011-BLG-149, respectively, and both companions are orbiting low-mass M dwarf host stars. More microlensing brown dwarfs are expected to be detected as the number of lensing events with well-covered light curves increases with new-generation searches.
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