Microlensing binaries with candidate brown dwarf companions

I. G. Shin, C. Han, A. Gould, A. Udalski, T. Sumi, M. Dominik, J. P. Beaulieu, Y. Tsapras, V. Bozza, M. K. Szymański, M. Kubiak, I. Soszyński, G. Pietrzyński, R. Poleski, K. Ulaczyk, P. Pietrukowicz, S. Kozłowski, J. Skowron, Wyrzykowski, F. Abe & 135 others D. P. Bennett, I. A. Bond, C. S. Botzler, M. Freeman, 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, G. W. Christie, D. L. Depoy, S. Dong, A. Gal-Yam, B. S. Gaudi, L. W. Hung, J. Janczak, S. Kaspi, D. Maoz, J. McCormick, D. McGregor, D. Moorhouse, J. A. Muñoz, T. Natusch, C. Nelson, R. W. Pogge, T. G. Tan, D. Polishook, Y. Shvartzvald, A. Shporer, G. Thornley, U. Malamud, J. C. Yee, J. Y. Choi, Y. K. Jung, H. Park, C. U. Lee, B. G. Park, J. R. Koo, D. Bajek, D. M. Bramich, P. Browne, K. Horne, S. Ipatov, C. Snodgrass, I. Steele, R. Street, Khalid Al-Subai, M. J. Burgdorf, S. Calchi Novati, P. Dodds, S. Dreizler, X. S. Fang, F. Grundahl, C. H. Gu, S. Hardis, K. Harpsoe, T. C. Hinse, M. Hundertmark, J. Jessen-Hansen, U. G. Jorgensen, N. Kains, E. Kerins, C. Liebig, M. Lund, M. Lundkvist, L. Mancini, M. Mathiasen, A. Hornstrup, M. T. Penny, S. Proft, S. Rahvar, D. Ricci, G. Scarpetta, J. Skottfelt, J. Southworth, J. Surdej, J. Tregloan-Reed, O. Wertz, F. Zimmer, M. D. Albrow, V. Batista, 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, K. Hill, M. Hoffman, 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

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number116
JournalAstrophysical Journal
Volume760
Issue number2
DOIs
Publication statusPublished - 1 Dec 2012

Fingerprint

lenses
dwarf stars
M stars
parallax
mass ratios
light curve
planets
planet
histories
stars
radii
history

Keywords

  • binaries: general
  • brown dwarfs
  • gravitational lensing: micro

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Shin, I. G., Han, C., Gould, A., Udalski, A., Sumi, T., Dominik, M., ... Zub, M. (2012). Microlensing binaries with candidate brown dwarf companions. Astrophysical Journal, 760(2), [116]. https://doi.org/10.1088/0004-637X/760/2/116

Microlensing binaries with candidate brown dwarf companions. / Shin, I. G.; Han, C.; Gould, A.; Udalski, A.; Sumi, T.; Dominik, M.; Beaulieu, J. P.; Tsapras, Y.; Bozza, V.; Szymański, M. K.; Kubiak, M.; Soszyński, I.; Pietrzyński, G.; Poleski, R.; Ulaczyk, K.; Pietrukowicz, P.; Kozłowski, S.; Skowron, J.; Wyrzykowski; Abe, F.; Bennett, D. P.; Bond, I. A.; Botzler, C. S.; Freeman, M.; 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; Christie, G. W.; Depoy, D. L.; Dong, S.; Gal-Yam, A.; Gaudi, B. S.; Hung, L. W.; Janczak, J.; Kaspi, S.; Maoz, D.; McCormick, J.; McGregor, D.; Moorhouse, D.; Muñoz, J. A.; Natusch, T.; Nelson, C.; Pogge, R. W.; Tan, T. G.; Polishook, D.; Shvartzvald, Y.; Shporer, A.; Thornley, G.; Malamud, U.; Yee, J. C.; Choi, J. Y.; Jung, Y. K.; Park, H.; Lee, C. U.; Park, B. G.; Koo, J. R.; Bajek, D.; Bramich, D. M.; Browne, P.; Horne, K.; Ipatov, S.; Snodgrass, C.; Steele, I.; Street, R.; Al-Subai, Khalid; Burgdorf, M. J.; Novati, S. Calchi; Dodds, P.; Dreizler, S.; Fang, X. S.; Grundahl, F.; Gu, C. H.; Hardis, S.; Harpsoe, K.; Hinse, T. C.; Hundertmark, M.; Jessen-Hansen, J.; Jorgensen, U. G.; Kains, N.; Kerins, E.; Liebig, C.; Lund, M.; Lundkvist, M.; Mancini, L.; Mathiasen, M.; Hornstrup, A.; Penny, M. T.; Proft, S.; Rahvar, S.; Ricci, D.; Scarpetta, G.; Skottfelt, J.; Southworth, J.; Surdej, J.; Tregloan-Reed, J.; Wertz, O.; Zimmer, F.; Albrow, M. D.; Batista, V.; 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.; Hill, K.; Hoffman, M.; 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.

In: Astrophysical Journal, Vol. 760, No. 2, 116, 01.12.2012.

Research output: Contribution to journalArticle

Shin, IG, Han, C, Gould, A, Udalski, A, Sumi, T, Dominik, M, Beaulieu, JP, Tsapras, Y, Bozza, V, Szymański, MK, Kubiak, M, Soszyński, I, Pietrzyński, G, Poleski, R, Ulaczyk, K, Pietrukowicz, P, Kozłowski, S, Skowron, J, Wyrzykowski, Abe, F, Bennett, DP, Bond, IA, Botzler, CS, Freeman, M, 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, Christie, GW, Depoy, DL, Dong, S, Gal-Yam, A, Gaudi, BS, Hung, LW, Janczak, J, Kaspi, S, Maoz, D, McCormick, J, McGregor, D, Moorhouse, D, Muñoz, JA, Natusch, T, Nelson, C, Pogge, RW, Tan, TG, Polishook, D, Shvartzvald, Y, Shporer, A, Thornley, G, Malamud, U, Yee, JC, Choi, JY, Jung, YK, Park, H, Lee, CU, Park, BG, Koo, JR, Bajek, D, Bramich, DM, Browne, P, Horne, K, Ipatov, S, Snodgrass, C, Steele, I, Street, R, Al-Subai, K, Burgdorf, MJ, Novati, SC, Dodds, P, Dreizler, S, Fang, XS, Grundahl, F, Gu, CH, Hardis, S, Harpsoe, K, Hinse, TC, Hundertmark, M, Jessen-Hansen, J, Jorgensen, UG, Kains, N, Kerins, E, Liebig, C, Lund, M, Lundkvist, M, Mancini, L, Mathiasen, M, Hornstrup, A, Penny, MT, Proft, S, Rahvar, S, Ricci, D, Scarpetta, G, Skottfelt, J, Southworth, J, Surdej, J, Tregloan-Reed, J, Wertz, O, Zimmer, F, Albrow, MD, Batista, V, 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, Hill, K, Hoffman, M, Kane, SR, Kubas, D, Marquette, JB, Martin, R, Meintjes, P, Menzies, J, Pollard, KR, Sahu, KC, Wambsganss, J, Williams, A, Vinter, C & Zub, M 2012, 'Microlensing binaries with candidate brown dwarf companions', Astrophysical Journal, vol. 760, no. 2, 116. https://doi.org/10.1088/0004-637X/760/2/116
Shin IG, Han C, Gould A, Udalski A, Sumi T, Dominik M et al. Microlensing binaries with candidate brown dwarf companions. Astrophysical Journal. 2012 Dec 1;760(2). 116. https://doi.org/10.1088/0004-637X/760/2/116
Shin, I. G. ; Han, C. ; Gould, A. ; Udalski, A. ; Sumi, T. ; Dominik, M. ; Beaulieu, J. P. ; Tsapras, Y. ; Bozza, V. ; Szymański, M. K. ; Kubiak, M. ; Soszyński, I. ; Pietrzyński, G. ; Poleski, R. ; Ulaczyk, K. ; Pietrukowicz, P. ; Kozłowski, S. ; Skowron, J. ; Wyrzykowski ; Abe, F. ; Bennett, D. P. ; Bond, I. A. ; Botzler, C. S. ; Freeman, M. ; 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 ; Christie, G. W. ; Depoy, D. L. ; Dong, S. ; Gal-Yam, A. ; Gaudi, B. S. ; Hung, L. W. ; Janczak, J. ; Kaspi, S. ; Maoz, D. ; McCormick, J. ; McGregor, D. ; Moorhouse, D. ; Muñoz, J. A. ; Natusch, T. ; Nelson, C. ; Pogge, R. W. ; Tan, T. G. ; Polishook, D. ; Shvartzvald, Y. ; Shporer, A. ; Thornley, G. ; Malamud, U. ; Yee, J. C. ; Choi, J. Y. ; Jung, Y. K. ; Park, H. ; Lee, C. U. ; Park, B. G. ; Koo, J. R. ; Bajek, D. ; Bramich, D. M. ; Browne, P. ; Horne, K. ; Ipatov, S. ; Snodgrass, C. ; Steele, I. ; Street, R. ; Al-Subai, Khalid ; Burgdorf, M. J. ; Novati, S. Calchi ; Dodds, P. ; Dreizler, S. ; Fang, X. S. ; Grundahl, F. ; Gu, C. H. ; Hardis, S. ; Harpsoe, K. ; Hinse, T. C. ; Hundertmark, M. ; Jessen-Hansen, J. ; Jorgensen, U. G. ; Kains, N. ; Kerins, E. ; Liebig, C. ; Lund, M. ; Lundkvist, M. ; Mancini, L. ; Mathiasen, M. ; Hornstrup, A. ; Penny, M. T. ; Proft, S. ; Rahvar, S. ; Ricci, D. ; Scarpetta, G. ; Skottfelt, J. ; Southworth, J. ; Surdej, J. ; Tregloan-Reed, J. ; Wertz, O. ; Zimmer, F. ; Albrow, M. D. ; Batista, V. ; 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. ; Hill, K. ; Hoffman, M. ; 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. / Microlensing binaries with candidate brown dwarf companions. In: Astrophysical Journal. 2012 ; Vol. 760, No. 2.
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title = "Microlensing binaries with candidate brown dwarf companions",
abstract = "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.",
keywords = "binaries: general, brown dwarfs, gravitational lensing: micro",
author = "Shin, {I. G.} and C. Han and A. Gould and A. Udalski and T. Sumi and M. Dominik and Beaulieu, {J. P.} and Y. Tsapras and V. Bozza and Szymański, {M. K.} and M. Kubiak and I. Soszyński and G. Pietrzyński and R. Poleski and K. Ulaczyk and P. Pietrukowicz and S. Kozłowski and J. Skowron and Wyrzykowski and F. Abe and Bennett, {D. P.} and Bond, {I. A.} and Botzler, {C. S.} and M. Freeman 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 Christie, {G. W.} and Depoy, {D. L.} and S. Dong and A. Gal-Yam and Gaudi, {B. S.} and Hung, {L. W.} and J. Janczak and S. Kaspi and D. Maoz and J. McCormick and D. McGregor and D. Moorhouse and Mu{\~n}oz, {J. A.} and T. Natusch and C. Nelson and Pogge, {R. W.} and Tan, {T. G.} and D. Polishook and Y. Shvartzvald and A. Shporer and G. Thornley and U. Malamud and Yee, {J. C.} and Choi, {J. Y.} and Jung, {Y. K.} and H. Park and Lee, {C. U.} and Park, {B. G.} and Koo, {J. R.} and D. Bajek and Bramich, {D. M.} and P. Browne and K. Horne and S. Ipatov and C. Snodgrass and I. Steele and R. Street and Khalid Al-Subai and Burgdorf, {M. J.} and Novati, {S. Calchi} and P. Dodds and S. Dreizler and Fang, {X. S.} and F. Grundahl and Gu, {C. H.} and S. Hardis and K. Harpsoe and Hinse, {T. C.} and M. Hundertmark and J. Jessen-Hansen and Jorgensen, {U. G.} and N. Kains and E. Kerins and C. Liebig and M. Lund and M. Lundkvist and L. Mancini and M. Mathiasen and A. Hornstrup and Penny, {M. T.} and S. Proft and S. Rahvar and D. Ricci and G. Scarpetta and J. Skottfelt and J. Southworth and J. Surdej and J. Tregloan-Reed and O. Wertz and F. Zimmer and Albrow, {M. D.} and V. Batista 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 K. Hill and M. Hoffman 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",
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volume = "760",
journal = "Astrophysical Journal",
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TY - JOUR

T1 - Microlensing binaries with candidate brown dwarf companions

AU - Shin, I. G.

AU - Han, C.

AU - Gould, A.

AU - Udalski, A.

AU - Sumi, T.

AU - Dominik, M.

AU - Beaulieu, J. P.

AU - Tsapras, Y.

AU - Bozza, V.

AU - Szymański, M. K.

AU - Kubiak, M.

AU - Soszyński, I.

AU - Pietrzyński, G.

AU - Poleski, R.

AU - Ulaczyk, K.

AU - Pietrukowicz, P.

AU - Kozłowski, S.

AU - Skowron, J.

AU - Wyrzykowski,

AU - Abe, F.

AU - Bennett, D. P.

AU - Bond, I. A.

AU - Botzler, C. S.

AU - Freeman, M.

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 - Christie, G. W.

AU - Depoy, D. L.

AU - Dong, S.

AU - Gal-Yam, A.

AU - Gaudi, B. S.

AU - Hung, L. W.

AU - Janczak, J.

AU - Kaspi, S.

AU - Maoz, D.

AU - McCormick, J.

AU - McGregor, D.

AU - Moorhouse, D.

AU - Muñoz, J. A.

AU - Natusch, T.

AU - Nelson, C.

AU - Pogge, R. W.

AU - Tan, T. G.

AU - Polishook, D.

AU - Shvartzvald, Y.

AU - Shporer, A.

AU - Thornley, G.

AU - Malamud, U.

AU - Yee, J. C.

AU - Choi, J. Y.

AU - Jung, Y. K.

AU - Park, H.

AU - Lee, C. U.

AU - Park, B. G.

AU - Koo, J. R.

AU - Bajek, D.

AU - Bramich, D. M.

AU - Browne, P.

AU - Horne, K.

AU - Ipatov, S.

AU - Snodgrass, C.

AU - Steele, I.

AU - Street, R.

AU - Al-Subai, Khalid

AU - Burgdorf, M. J.

AU - Novati, S. Calchi

AU - Dodds, P.

AU - Dreizler, S.

AU - Fang, X. S.

AU - Grundahl, F.

AU - Gu, C. H.

AU - Hardis, S.

AU - Harpsoe, K.

AU - Hinse, T. C.

AU - Hundertmark, M.

AU - Jessen-Hansen, J.

AU - Jorgensen, U. G.

AU - Kains, N.

AU - Kerins, E.

AU - Liebig, C.

AU - Lund, M.

AU - Lundkvist, M.

AU - Mancini, L.

AU - Mathiasen, M.

AU - Hornstrup, A.

AU - Penny, M. T.

AU - Proft, S.

AU - Rahvar, S.

AU - Ricci, D.

AU - Scarpetta, G.

AU - Skottfelt, J.

AU - Southworth, J.

AU - Surdej, J.

AU - Tregloan-Reed, J.

AU - Wertz, O.

AU - Zimmer, F.

AU - Albrow, M. D.

AU - Batista, V.

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 - Hill, K.

AU - Hoffman, M.

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.

PY - 2012/12/1

Y1 - 2012/12/1

N2 - 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.

AB - 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.

KW - binaries: general

KW - brown dwarfs

KW - gravitational lensing: micro

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U2 - 10.1088/0004-637X/760/2/116

DO - 10.1088/0004-637X/760/2/116

M3 - Article

VL - 760

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 116

ER -