Microlensing binaries discovered through high-magnification channel

I. G. Shin, J. Y. Choi, S. Y. Park, C. Han, A. Gould, T. Sumi, A. Udalski, J. P. Beaulieu, M. Dominik, W. Allen, M. Bos, G. W. Christie, D. L. Depoy, S. Dong, J. Drummond, A. Gal-Yam, B. S. Gaudi, L. W. Hung, J. Janczak, S. Kaspi & 132 others C. U. Lee, F. Mallia, D. Maoz, A. Maury, J. McCormick, L. A G Monard, D. Moorhouse, J. A. Mũoz, T. Natusch, C. Nelson, B. G. Park, R. W. Pogge, D. Polishook, Y. Shvartzvald, A. Shporer, G. Thornley, J. C. Yee, F. Abe, D. P. Bennett, I. A. Bond, C. S. Botzler, A. Fukui, K. Furusawa, F. Hayashi, J. B. Hearnshaw, S. Hosaka, Y. Itow, K. Kamiya, P. M. Kilmartin, S. Kobara, A. Korpela, W. Lin, C. H. Ling, S. Makita, K. Masuda, Y. Matsubara, N. Miyake, Y. Muraki, M. Nagaya, K. Nishimoto, K. Ohnishi, T. Okumura, K. Omori, Y. C. Perrott, N. Rattenbury, To Saito, L. Skuljan, D. J. Sullivan, D. Suzuki, W. L. Sweatman, P. J. Tristram, K. Wada, P. C M Yock, M. K. Szymański, M. Kubiak, G. Pietrzyński, I. Soszyński, R. Poleski, K. Ulaczyk, L. Wyrzykowski, S. Kozłowski, P. Pietrukowicz, M. D. Albrow, V. Batista, D. M. Bramich, S. Brillant, J. A R Caldwell, J. J. Calitz, A. Cassan, A. Cole, K. H. Cook, E. Corrales, Ch Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, P. Fouqué, J. Greenhill, M. Hoffman, U. G. Jørgensen, S. R. Kane, D. Kubas, J. B. Marquette, R. Martin, P. Meintjes, J. Menzies, K. R. Pollard, K. C. Sahu, J. Wambsganss, A. Williams, C. Vinter, M. Zub, A. Allan, P. Browne, K. Horne, C. Snodgrass, I. Steele, R. Street, Y. Tsapras, Khalid Al-Subai, V. Bozza, P. Browne, M. J. Burgdorf, S. Calchi Novati, P. Dodds, S. Dreizler, F. Finet, T. Gerner, M. Glitrup, F. Grundahl, S. Hardis, K. Harpsøe, F. V. Hessman, T. C. Hinse, M. Hundertmark, N. Kains, E. Kerins, C. Liebig, G. Maier, L. Mancini, M. Mathiasen, M. T. Penny, S. Proft, S. Rahvar, D. Ricci, G. Scarpetta, S. Schäfer, F. Schönebeck, J. Skottfelt, J. Surdej, J. Southworth, F. Zimmer

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number127
JournalAstrophysical Journal
Volume746
Issue number2
DOIs
Publication statusPublished - 20 Feb 2012

Fingerprint

magnification
perturbation
mass ratios
light curve
planet
probe
planets
confidence
alkalies
lenses
prediction
probes
predictions
distribution

Keywords

  • binaries: general
  • gravitational lensing: micro

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Shin, I. G., Choi, J. Y., Park, S. Y., Han, C., Gould, A., Sumi, T., ... Zimmer, F. (2012). Microlensing binaries discovered through high-magnification channel. Astrophysical Journal, 746(2), [127]. https://doi.org/10.1088/0004-637X/746/2/127

Microlensing binaries discovered through high-magnification channel. / Shin, I. G.; Choi, J. Y.; Park, S. Y.; Han, C.; Gould, A.; Sumi, T.; Udalski, A.; Beaulieu, J. P.; Dominik, M.; Allen, W.; Bos, M.; Christie, G. W.; Depoy, D. L.; Dong, S.; Drummond, J.; Gal-Yam, A.; Gaudi, B. S.; Hung, L. W.; Janczak, J.; Kaspi, S.; Lee, C. U.; Mallia, F.; Maoz, D.; Maury, A.; McCormick, J.; Monard, L. A G; Moorhouse, D.; Mũoz, J. A.; Natusch, T.; Nelson, C.; Park, B. G.; Pogge, R. W.; Polishook, D.; Shvartzvald, Y.; Shporer, A.; Thornley, G.; Yee, J. C.; Abe, F.; Bennett, D. P.; Bond, I. A.; Botzler, C. S.; Fukui, A.; Furusawa, K.; Hayashi, F.; Hearnshaw, J. B.; Hosaka, S.; Itow, Y.; Kamiya, K.; Kilmartin, P. M.; Kobara, S.; Korpela, A.; Lin, W.; Ling, C. H.; Makita, S.; Masuda, K.; Matsubara, Y.; Miyake, N.; Muraki, Y.; Nagaya, M.; Nishimoto, K.; Ohnishi, K.; Okumura, T.; Omori, K.; Perrott, Y. C.; Rattenbury, N.; Saito, To; Skuljan, L.; Sullivan, D. J.; Suzuki, D.; Sweatman, W. L.; Tristram, P. J.; Wada, K.; Yock, P. C M; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Soszyński, I.; Poleski, R.; Ulaczyk, K.; Wyrzykowski, L.; Kozłowski, S.; Pietrukowicz, P.; Albrow, M. D.; Batista, V.; Bramich, D. M.; Brillant, S.; Caldwell, J. A R; Calitz, J. J.; Cassan, A.; Cole, A.; Cook, K. H.; Corrales, E.; Coutures, Ch; Dieters, S.; Prester, D. Dominis; Donatowicz, J.; Fouqué, P.; Greenhill, J.; Hoffman, M.; Jørgensen, U. G.; Kane, S. R.; Kubas, D.; Marquette, J. B.; Martin, R.; Meintjes, P.; Menzies, J.; Pollard, K. R.; Sahu, K. C.; Wambsganss, J.; Williams, A.; Vinter, C.; Zub, M.; Allan, A.; Browne, P.; Horne, K.; Snodgrass, C.; Steele, I.; Street, R.; Tsapras, Y.; Al-Subai, Khalid; Bozza, V.; Browne, P.; Burgdorf, M. J.; Novati, S. Calchi; Dodds, P.; Dreizler, S.; Finet, F.; Gerner, T.; Glitrup, M.; Grundahl, F.; Hardis, S.; Harpsøe, K.; Hessman, F. V.; Hinse, T. C.; Hundertmark, M.; Kains, N.; Kerins, E.; Liebig, C.; Maier, G.; Mancini, L.; Mathiasen, M.; Penny, M. T.; Proft, S.; Rahvar, S.; Ricci, D.; Scarpetta, G.; Schäfer, S.; Schönebeck, F.; Skottfelt, J.; Surdej, J.; Southworth, J.; Zimmer, F.

In: Astrophysical Journal, Vol. 746, No. 2, 127, 20.02.2012.

Research output: Contribution to journalArticle

Shin, IG, Choi, JY, Park, SY, Han, C, Gould, A, Sumi, T, Udalski, A, Beaulieu, JP, Dominik, M, Allen, W, Bos, M, Christie, GW, Depoy, DL, Dong, S, Drummond, J, Gal-Yam, A, Gaudi, BS, Hung, LW, Janczak, J, Kaspi, S, Lee, CU, Mallia, F, Maoz, D, Maury, A, McCormick, J, Monard, LAG, Moorhouse, D, Mũoz, JA, Natusch, T, Nelson, C, Park, BG, Pogge, RW, Polishook, D, Shvartzvald, Y, Shporer, A, Thornley, G, Yee, JC, Abe, F, Bennett, DP, Bond, IA, Botzler, CS, Fukui, A, Furusawa, K, Hayashi, F, Hearnshaw, JB, Hosaka, S, Itow, Y, Kamiya, K, Kilmartin, PM, Kobara, S, Korpela, A, Lin, W, Ling, CH, Makita, S, Masuda, K, Matsubara, Y, Miyake, N, Muraki, Y, Nagaya, M, Nishimoto, K, Ohnishi, K, Okumura, T, Omori, K, Perrott, YC, Rattenbury, N, Saito, T, Skuljan, L, Sullivan, DJ, Suzuki, D, Sweatman, WL, Tristram, PJ, Wada, K, Yock, PCM, Szymański, MK, Kubiak, M, Pietrzyński, G, Soszyński, I, Poleski, R, Ulaczyk, K, Wyrzykowski, L, Kozłowski, S, Pietrukowicz, P, Albrow, MD, Batista, V, Bramich, DM, Brillant, S, Caldwell, JAR, Calitz, JJ, Cassan, A, Cole, A, Cook, KH, Corrales, E, Coutures, C, Dieters, S, Prester, DD, Donatowicz, J, Fouqué, P, Greenhill, J, Hoffman, M, Jørgensen, UG, Kane, SR, Kubas, D, Marquette, JB, Martin, R, Meintjes, P, Menzies, J, Pollard, KR, Sahu, KC, Wambsganss, J, Williams, A, Vinter, C, Zub, M, Allan, A, Browne, P, Horne, K, Snodgrass, C, Steele, I, Street, R, Tsapras, Y, Al-Subai, K, Bozza, V, Browne, P, Burgdorf, MJ, Novati, SC, Dodds, P, Dreizler, S, Finet, F, Gerner, T, Glitrup, M, Grundahl, F, Hardis, S, Harpsøe, K, Hessman, FV, Hinse, TC, Hundertmark, M, Kains, N, Kerins, E, Liebig, C, Maier, G, Mancini, L, Mathiasen, M, Penny, MT, Proft, S, Rahvar, S, Ricci, D, Scarpetta, G, Schäfer, S, Schönebeck, F, Skottfelt, J, Surdej, J, Southworth, J & Zimmer, F 2012, 'Microlensing binaries discovered through high-magnification channel', Astrophysical Journal, vol. 746, no. 2, 127. https://doi.org/10.1088/0004-637X/746/2/127
Shin, I. G. ; Choi, J. Y. ; Park, S. Y. ; Han, C. ; Gould, A. ; Sumi, T. ; Udalski, A. ; Beaulieu, J. P. ; Dominik, M. ; Allen, W. ; Bos, M. ; Christie, G. W. ; Depoy, D. L. ; Dong, S. ; Drummond, J. ; Gal-Yam, A. ; Gaudi, B. S. ; Hung, L. W. ; Janczak, J. ; Kaspi, S. ; Lee, C. U. ; Mallia, F. ; Maoz, D. ; Maury, A. ; McCormick, J. ; Monard, L. A G ; Moorhouse, D. ; Mũoz, J. A. ; Natusch, T. ; Nelson, C. ; Park, B. G. ; Pogge, R. W. ; Polishook, D. ; Shvartzvald, Y. ; Shporer, A. ; Thornley, G. ; Yee, J. C. ; Abe, F. ; Bennett, D. P. ; Bond, I. A. ; Botzler, C. S. ; Fukui, A. ; Furusawa, K. ; Hayashi, F. ; Hearnshaw, J. B. ; Hosaka, S. ; Itow, Y. ; Kamiya, K. ; Kilmartin, P. M. ; Kobara, S. ; Korpela, A. ; Lin, W. ; Ling, C. H. ; Makita, S. ; Masuda, K. ; Matsubara, Y. ; Miyake, N. ; Muraki, Y. ; Nagaya, M. ; Nishimoto, K. ; Ohnishi, K. ; Okumura, T. ; Omori, K. ; Perrott, Y. C. ; Rattenbury, N. ; Saito, To ; Skuljan, L. ; Sullivan, D. J. ; Suzuki, D. ; Sweatman, W. L. ; Tristram, P. J. ; Wada, K. ; Yock, P. C M ; Szymański, M. K. ; Kubiak, M. ; Pietrzyński, G. ; Soszyński, I. ; Poleski, R. ; Ulaczyk, K. ; Wyrzykowski, L. ; Kozłowski, S. ; Pietrukowicz, P. ; Albrow, M. D. ; Batista, V. ; Bramich, D. M. ; Brillant, S. ; Caldwell, J. A R ; Calitz, J. J. ; Cassan, A. ; Cole, A. ; Cook, K. H. ; Corrales, E. ; Coutures, Ch ; Dieters, S. ; Prester, D. Dominis ; Donatowicz, J. ; Fouqué, P. ; Greenhill, J. ; Hoffman, M. ; Jørgensen, U. G. ; Kane, S. R. ; Kubas, D. ; Marquette, J. B. ; Martin, R. ; Meintjes, P. ; Menzies, J. ; Pollard, K. R. ; Sahu, K. C. ; Wambsganss, J. ; Williams, A. ; Vinter, C. ; Zub, M. ; Allan, A. ; Browne, P. ; Horne, K. ; Snodgrass, C. ; Steele, I. ; Street, R. ; Tsapras, Y. ; Al-Subai, Khalid ; Bozza, V. ; Browne, P. ; Burgdorf, M. J. ; Novati, S. Calchi ; Dodds, P. ; Dreizler, S. ; Finet, F. ; Gerner, T. ; Glitrup, M. ; Grundahl, F. ; Hardis, S. ; Harpsøe, K. ; Hessman, F. V. ; Hinse, T. C. ; Hundertmark, M. ; Kains, N. ; Kerins, E. ; Liebig, C. ; Maier, G. ; Mancini, L. ; Mathiasen, M. ; Penny, M. T. ; Proft, S. ; Rahvar, S. ; Ricci, D. ; Scarpetta, G. ; Schäfer, S. ; Schönebeck, F. ; Skottfelt, J. ; Surdej, J. ; Southworth, J. ; Zimmer, F. / Microlensing binaries discovered through high-magnification channel. In: Astrophysical Journal. 2012 ; Vol. 746, No. 2.
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title = "Microlensing binaries discovered through high-magnification channel",
abstract = "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.",
keywords = "binaries: general, gravitational lensing: micro",
author = "Shin, {I. G.} and Choi, {J. Y.} and Park, {S. Y.} and C. Han and A. Gould and T. Sumi and A. Udalski and Beaulieu, {J. P.} and M. Dominik and W. Allen and M. Bos and Christie, {G. W.} and Depoy, {D. L.} and S. Dong and J. Drummond and A. Gal-Yam and Gaudi, {B. S.} and Hung, {L. W.} and J. Janczak and S. Kaspi and Lee, {C. U.} and F. Mallia and D. Maoz and A. Maury and J. McCormick and Monard, {L. A G} and D. Moorhouse and Mũoz, {J. A.} and T. Natusch and C. Nelson and Park, {B. G.} and Pogge, {R. W.} and D. Polishook and Y. Shvartzvald and A. Shporer and G. Thornley and Yee, {J. C.} and F. Abe and Bennett, {D. P.} and Bond, {I. A.} and Botzler, {C. S.} and A. Fukui and K. Furusawa and F. Hayashi and Hearnshaw, {J. B.} and S. Hosaka and Y. Itow and K. Kamiya and Kilmartin, {P. M.} and S. Kobara and A. Korpela and W. Lin and Ling, {C. H.} and S. Makita and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and M. Nagaya and K. Nishimoto and K. Ohnishi and T. Okumura and K. Omori and Perrott, {Y. C.} and N. Rattenbury and To Saito and L. Skuljan and Sullivan, {D. J.} and D. Suzuki and Sweatman, {W. L.} and Tristram, {P. J.} and K. Wada and Yock, {P. C M} and Szymański, {M. K.} and M. Kubiak and G. Pietrzyński and I. Soszyński and R. Poleski and K. Ulaczyk and L. Wyrzykowski and S. Kozłowski and P. Pietrukowicz and Albrow, {M. D.} and V. Batista and Bramich, {D. M.} and S. Brillant and Caldwell, {J. A R} and Calitz, {J. J.} and A. Cassan and A. Cole and Cook, {K. H.} and E. Corrales and Ch Coutures and S. Dieters and Prester, {D. Dominis} and J. Donatowicz and P. Fouqu{\'e} and J. Greenhill and M. Hoffman and J{\o}rgensen, {U. G.} and Kane, {S. R.} and D. Kubas and Marquette, {J. B.} and R. Martin and P. Meintjes and J. Menzies and Pollard, {K. R.} and Sahu, {K. C.} and J. Wambsganss and A. Williams and C. Vinter and M. Zub and A. Allan and P. Browne and K. Horne and C. Snodgrass and I. Steele and R. Street and Y. Tsapras and Khalid Al-Subai and V. Bozza and P. Browne and Burgdorf, {M. J.} and Novati, {S. Calchi} and P. Dodds and S. Dreizler and F. Finet and T. Gerner and M. Glitrup and F. Grundahl and S. Hardis and K. Harps{\o}e and Hessman, {F. V.} and Hinse, {T. C.} and M. Hundertmark and N. Kains and E. Kerins and C. Liebig and G. Maier and L. Mancini and M. Mathiasen and Penny, {M. T.} and S. Proft and S. Rahvar and D. Ricci and G. Scarpetta and S. Sch{\"a}fer and F. Sch{\"o}nebeck and J. Skottfelt and J. Surdej and J. Southworth and F. Zimmer",
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TY - JOUR

T1 - Microlensing binaries discovered through high-magnification channel

AU - Shin, I. G.

AU - Choi, J. Y.

AU - Park, S. Y.

AU - Han, C.

AU - Gould, A.

AU - Sumi, T.

AU - Udalski, A.

AU - Beaulieu, J. P.

AU - Dominik, M.

AU - Allen, W.

AU - Bos, M.

AU - Christie, G. W.

AU - Depoy, D. L.

AU - Dong, S.

AU - Drummond, J.

AU - Gal-Yam, A.

AU - Gaudi, B. S.

AU - Hung, L. W.

AU - Janczak, J.

AU - Kaspi, S.

AU - Lee, C. U.

AU - Mallia, F.

AU - Maoz, D.

AU - Maury, A.

AU - McCormick, J.

AU - Monard, L. A G

AU - Moorhouse, D.

AU - Mũoz, J. A.

AU - Natusch, T.

AU - Nelson, C.

AU - Park, B. G.

AU - Pogge, R. W.

AU - Polishook, D.

AU - Shvartzvald, Y.

AU - Shporer, A.

AU - Thornley, G.

AU - Yee, J. C.

AU - Abe, F.

AU - Bennett, D. P.

AU - Bond, I. A.

AU - Botzler, C. S.

AU - Fukui, A.

AU - Furusawa, K.

AU - Hayashi, F.

AU - Hearnshaw, J. B.

AU - Hosaka, S.

AU - Itow, Y.

AU - Kamiya, K.

AU - Kilmartin, P. M.

AU - Kobara, S.

AU - Korpela, A.

AU - Lin, W.

AU - Ling, C. H.

AU - Makita, S.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Miyake, N.

AU - Muraki, Y.

AU - Nagaya, M.

AU - Nishimoto, K.

AU - Ohnishi, K.

AU - Okumura, T.

AU - Omori, K.

AU - Perrott, Y. C.

AU - Rattenbury, N.

AU - Saito, To

AU - Skuljan, L.

AU - Sullivan, D. J.

AU - Suzuki, D.

AU - Sweatman, W. L.

AU - Tristram, P. J.

AU - Wada, K.

AU - Yock, P. C M

AU - Szymański, M. K.

AU - Kubiak, M.

AU - Pietrzyński, G.

AU - Soszyński, I.

AU - Poleski, R.

AU - Ulaczyk, K.

AU - Wyrzykowski, L.

AU - Kozłowski, S.

AU - Pietrukowicz, P.

AU - Albrow, M. D.

AU - Batista, V.

AU - Bramich, D. M.

AU - Brillant, S.

AU - Caldwell, J. A R

AU - Calitz, J. J.

AU - Cassan, A.

AU - Cole, A.

AU - Cook, K. H.

AU - Corrales, E.

AU - Coutures, Ch

AU - Dieters, S.

AU - Prester, D. Dominis

AU - Donatowicz, J.

AU - Fouqué, P.

AU - Greenhill, J.

AU - Hoffman, M.

AU - Jørgensen, U. G.

AU - Kane, S. R.

AU - Kubas, D.

AU - Marquette, J. B.

AU - Martin, R.

AU - Meintjes, P.

AU - Menzies, J.

AU - Pollard, K. R.

AU - Sahu, K. C.

AU - Wambsganss, J.

AU - Williams, A.

AU - Vinter, C.

AU - Zub, M.

AU - Allan, A.

AU - Browne, P.

AU - Horne, K.

AU - Snodgrass, C.

AU - Steele, I.

AU - Street, R.

AU - Tsapras, Y.

AU - Al-Subai, Khalid

AU - Bozza, V.

AU - Browne, P.

AU - Burgdorf, M. J.

AU - Novati, S. Calchi

AU - Dodds, P.

AU - Dreizler, S.

AU - Finet, F.

AU - Gerner, T.

AU - Glitrup, M.

AU - Grundahl, F.

AU - Hardis, S.

AU - Harpsøe, K.

AU - Hessman, F. V.

AU - Hinse, T. C.

AU - Hundertmark, M.

AU - Kains, N.

AU - Kerins, E.

AU - Liebig, C.

AU - Maier, G.

AU - Mancini, L.

AU - Mathiasen, M.

AU - Penny, M. T.

AU - Proft, S.

AU - Rahvar, S.

AU - Ricci, D.

AU - Scarpetta, G.

AU - Schäfer, S.

AU - Schönebeck, F.

AU - Skottfelt, J.

AU - Surdej, J.

AU - Southworth, J.

AU - Zimmer, F.

PY - 2012/2/20

Y1 - 2012/2/20

N2 - 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.

AB - 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.

KW - binaries: general

KW - gravitational lensing: micro

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U2 - 10.1088/0004-637X/746/2/127

DO - 10.1088/0004-637X/746/2/127

M3 - Article

VL - 746

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 127

ER -