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Microlensing binaries discovered through high-magnification channel


Shin, I-G and Choi, J-Y and Park, S-Y and Han, C and Gould, A and Sumi, T and Udalski, A and Beaulieu, J-P and Dominik, M and Allen, W and Bos, M and Christie, GW and Depoy, DL and Dong, S and Drummond, J and Gal-Yam, A and Gaudi, BS and Hung, L-W and Janczak, J and Kaspi, S and Lee, C-U and Mallia, F and Maoz, D and Maury, A and McCormick, J and Monard, LAG and Moorhouse, D and Munoz, JA and Natusch, T and Nelson, C and Park, B-G and Pogge, RW and Polishook, D and Shvartzvald, Y and Shporer, A and Thornley, G and Yee, JC and Abe, F and Bennett, DP and Bond, IA and Botzler, CS 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, T and Skuljan, L and Sullivan, DJ and Suzuki, D and Sweatman, WL and Tristram, PJ and Wada, K and Yock, PCM and Szymanski, MK and Kubiak, M and Pietrzynski, G and Soszynski, I and Poleski, R and Ulaczyk, K and Wyrzykowski, L and Kozlowski, S and Pietrukowicz, P and Albrow, MD and Batista, V and Bramich, DM and Brillant, S and Caldwell, JAR and Calitz, JJ and Cassan, A and Cole, A and Cook, KH and Corrales, E and Coutures, C and Dieters, S and Prester, DD and Donatowicz, J and Fouque, P and Greenhill, J and Hoffman, M and Jorgensen, UG 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 and Allan, A and Browne, P and Horne, K and Snodgrass, C and Steele, I and Street, R and Tsapras, Y and Alsubai, KA and Bozza, V and Browne, P and Burgdorf, MJ and Novati, SC and Dodds, P and Dreizler, S and Finet, F and Gerner, T and Glitrup, M and Grundahl, F and Hardis, S and Harpsoe, K and Hessman, FV and Hinse, TC and Hundertmark, M and Kains, N and Kerins, E and Liebig, C and Maier, G and Mancini, L and Mathiasen, M and Penny, MT and Proft, S and Rahvar, S and Ricci, D and Scarpetta, G and Schafer, S and Schonebeck, F and Skottfelt, J and Surdej, J and Southworth, J and Zimmer, F, Microlensing binaries discovered through high-magnification channel, Astrophysical Journal, 746, (2) Article 127. ISSN 0004-637X (2012) [Refereed Article]

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Copyright 2012 The American Astronomical Society

DOI: doi:10.1088/0004-637X/746/2/127


Microlensing can provide a useful tool to probe binary distributions down to low-mass limits of binary companions. In this paper, we analyze the light curves of eight binary-lensing events detected through the channel of high-magnification events during the seasons from 2007 to 2010. The perturbations, which are confined near the peak of the light curves, can be easily distinguished from the central perturbations caused by planets. However, the degeneracy between close and wide binary solutions cannot be resolved with a 3σ confidence level for three events, implying that the degeneracy would be an important obstacle in studying binary distributions. The dependence of the degeneracy on the lensing parameters is consistent with a theoretical prediction that the degeneracy becomes severe as the binary separation and the mass ratio deviate from the values of resonant caustics. The measured mass ratio of the event OGLE-2008-BLG-510/MOA-2008-BLG-369 is q ~ 0.1, making the companion of the lens a strong brown dwarf candidate.

Item Details

Item Type:Refereed Article
Keywords:binaries: general; 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, A (Professor Andrew Cole)
UTAS Author:Greenhill, J (Dr John Greenhill)
ID Code:79936
Year Published:2012
Web of Science® Times Cited:14
Deposited By:Mathematics and Physics
Deposited On:2012-10-15
Last Modified:2017-11-06

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