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Microlensing binaries with candidate brown dwarf companions


Shin, I-G and Han, C and Gould, A and Udalski, A and Sumi, T and Dominik, M and Beaulieu, J-P and Tsapras, Y and Bozza, V and Szymanski, MK and Kubiak, M and Soszynski, I and Pietrzynski, G and Poleski, R and Ulacyk, K and Pietrukowicz, P and Kozlowski, S and Skowron, J and Wyrzykowski, L and Abe, F and Bennett, DP and Bond, IA and Botzler, CS and Freeman, M and Fukui, A and Furusawa, K and Hayashi, F and Hearnshaw, JB and Hosaka, S and Itow, Y and Kamiya, K and Kilmartin, PM and Kobara, S and Korpela, A and Lin, W and Ling, CH and Makita, S and Masuda, K and Matsubara, Y and Miyake, N and Muraki, Y and Nagaya, M and Nishimoto, K and Ohnishi, K and Okumura, T and Omori, K and Perrott, YC and Rattenbury, N and Saito, To and Skuljan, L and Sullivan, DJ and Suzuki, D and Sweatman, WL and Tristram, PJ and Wada, K and Yock, PCM and Christie, GW and Depoy, DL and Dong, S and Gal-Yam, A and Gaudi, BS and Hung, L-W and Janczak, J and Kaspi, S and Maoz, D and McCormick, J and McGregor, D and Moorehouse, D and Munoz, JA and Natusch, T and Nelson, C and Pogge, RW and Tan, T-G and Polishook, D and Shvzrtzald, Y and Shporer, A and Thornley, G and Malamud, U and Yee, JC and Choi, J-Y and Jung, Y-K and Park, H and Lee, C-U and Park, B-G and Koo, J-R and Bajek, D and Bramich, DM and Browne, P and Horne, K and Ipatov, S and Snodgrass, C and Steele, I and Street, R and Alsubai, KA and Burgdorf, MJ and Calchi Novati, S and Dodds, P and Dreizler, S and Fang, X-S and Grundahl, F and Gu, C-H and Hardis, S and Harpsoe, K and Hinse, TC and Hundertmark, M and Jessen-Hansen, J and Jorgensen, UG and Kains, N and Kerins, E and Liebig, C and Lund, M and Lundkvist, M and Mancini, L and Mathiasen, M and Hornstrup, A and Penny, MT and Proft, S and Rahvar, S and Ricci, D and Scarpetta, G and Skottfelt, J and Southworth, J and Surdej, J and Tregloan-Reed, J and Wertz, O and Zimmer, F and Albrow, MD and Batista, V and Brillant, S and Caldwell, JAR and Calitz, JJ and Cassan, A and Cole, AA and Cook, KH and Corrales, E and Coutures, Ch and Dieters, S and Dominis Prester, D and Donatowicz, J and Fouque, P and Greenhill, JG and Hill, KM and Hoffman, M and Kane, SR and Kubas, D and Marquette, J-B and Martin, R and Meintjes, P and Menzies, J and Pollard, KR and Sahu, KC and Wambsganss, J and Williams, A and Vinter, C and Zub, M, Microlensing binaries with candidate brown dwarf companions, The Astrophysical Journal, 760, (2) Article 116. ISSN 0004-637X (2012) [Refereed Article]

Copyright Statement

Copyright 2012 The American Astronomical Society

DOI: doi:10.1088/0004-637X/760/2/116


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.

Item Details

Item Type:Refereed Article
Keywords:binaries: general; brown dwarfs; gravitational lensing: micro
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Stellar astronomy and planetary systems
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Cole, AA (Professor Andrew Cole)
UTAS Author:Greenhill, JG (Dr John Greenhill)
UTAS Author:Hill, KM (Dr Kym Hill)
ID Code:82651
Year Published:2012
Web of Science® Times Cited:15
Deposited By:Mathematics and Physics
Deposited On:2013-02-12
Last Modified:2017-11-06

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