Microlensing discovery of a population of very tight, very low mass binary brown dwarfs

J. Y. Choi, C. Han, A. Udalski, T. Sumi, B. S. Gaudi, A. Gould, D. P. Bennett, M. Dominik, J. P. Beaulieu, Y. Tsapras, V. Bozza, F. Abe, I. A. Bond, C. S. Botzler, P. Chote, M. Freeman, A. Fukui, K. Furusawa, Y. Itow, C. H. Ling & 104 others K. Masuda, Y. Matsubara, N. Miyake, Y. Muraki, K. Ohnishi, N. J. Rattenbury, To Saito, D. J. Sullivan, K. Suzuki, W. L. Sweatman, D. Suzuki, S. Takino, P. J. Tristram, K. Wada, P. C M Yock, M. K. Szymański, M. Kubiak, G. Pietrzyński, I. Soszyński, J. Skowron, S. Kozłowski, R. Poleski, K. Ulaczyk, Wyrzykowski, P. Pietrukowicz, L. A. Almeida, D. L. Depoy, Subo Dong, E. Gorbikov, F. Jablonski, C. B. Henderson, K. H. Hwang, J. Janczak, Y. K. Jung, S. Kaspi, C. U. Lee, U. Malamud, D. Maoz, D. Mcgregor, J. A. Muñoz, B. G. Park, H. Park, R. W. Pogge, Y. Shvartzvald, I. G. Shin, J. C. Yee, Khalid Al-Subai, P. Browne, M. J. Burgdorf, S. Calchi Novati, P. Dodds, X. S. Fang, F. Finet, M. Glitrup, F. Grundahl, S. H. Gu, S. Hardis, K. Harpsøe, T. C. Hinse, A. Hornstrup, M. Hundertmark, J. Jessen-Hansen, U. G. Jrgensen, N. Kains, E. Kerins, C. Liebig, M. N. Lund, M. Lundkvist, G. Maier, L. Mancini, M. Mathiasen, M. T. Penny, S. Rahvar, D. Ricci, G. Scarpetta, J. Skottfelt, C. Snodgrass, J. Southworth, J. Surdej, J. Tregloan-Reed, J. Wambsganss, O. Wertz, F. Zimmer, M. D. Albrow, E. Bachelet, V. Batista, S. Brillant, A. Cassan, A. A. Cole, C. Coutures, S. Dieters, D. Dominis Prester, J. Donatowicz, P. Fouqué, J. Greenhill, D. Kubas, J. B. Marquette, J. W. Menzies, K. C. Sahu, M. Zub, D. M. Bramich, K. Horne, I. A. Steele, R. A. Street

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Although many models have been proposed, the physical mechanisms responsible for the formation of low-mass brown dwarfs (BDs) are poorly understood. The multiplicity properties and minimum mass of the BD mass function provide critical empirical diagnostics of these mechanisms. We present the discovery via gravitational microlensing of two very low mass, very tight binary systems. These binaries have directly and precisely measured total system masses of 0.025 M· and 0.034 M·, and projected separations of 0.31 AU and 0.19 AU, making them the lowest-mass and tightest field BD binaries known. The discovery of a population of such binaries indicates that BD binaries can robustly form at least down to masses of 0.02 M·. Future microlensing surveys will measure a mass-selected sample of BD binary systems, which can then be directly compared to similar samples of stellar binaries.

Original languageEnglish
Article number129
JournalAstrophysical Journal
Volume768
Issue number2
DOIs
Publication statusPublished - 10 May 2013

Keywords

  • binaries: general
  • gravitational lensing: micro

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Choi, J. Y., Han, C., Udalski, A., Sumi, T., Gaudi, B. S., Gould, A., ... Street, R. A. (2013). Microlensing discovery of a population of very tight, very low mass binary brown dwarfs. Astrophysical Journal, 768(2), [129]. https://doi.org/10.1088/0004-637X/768/2/129

Microlensing discovery of a population of very tight, very low mass binary brown dwarfs. / Choi, J. Y.; Han, C.; Udalski, A.; Sumi, T.; Gaudi, B. S.; Gould, A.; Bennett, D. P.; Dominik, M.; Beaulieu, J. P.; Tsapras, Y.; Bozza, V.; Abe, F.; Bond, I. A.; Botzler, C. S.; Chote, P.; Freeman, M.; Fukui, A.; Furusawa, K.; Itow, Y.; Ling, C. H.; Masuda, K.; Matsubara, Y.; Miyake, N.; Muraki, Y.; Ohnishi, K.; Rattenbury, N. J.; Saito, To; Sullivan, D. J.; Suzuki, K.; Sweatman, W. L.; Suzuki, D.; Takino, S.; Tristram, P. J.; Wada, K.; Yock, P. C M; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Soszyński, I.; Skowron, J.; Kozłowski, S.; Poleski, R.; Ulaczyk, K.; Wyrzykowski; Pietrukowicz, P.; Almeida, L. A.; Depoy, D. L.; Dong, Subo; Gorbikov, E.; Jablonski, F.; Henderson, C. B.; Hwang, K. H.; Janczak, J.; Jung, Y. K.; Kaspi, S.; Lee, C. U.; Malamud, U.; Maoz, D.; Mcgregor, D.; Muñoz, J. A.; Park, B. G.; Park, H.; Pogge, R. W.; Shvartzvald, Y.; Shin, I. G.; Yee, J. C.; Al-Subai, Khalid; Browne, P.; Burgdorf, M. J.; Novati, S. Calchi; Dodds, P.; Fang, X. S.; Finet, F.; Glitrup, M.; Grundahl, F.; Gu, S. H.; Hardis, S.; Harpsøe, K.; Hinse, T. C.; Hornstrup, A.; Hundertmark, M.; Jessen-Hansen, J.; Jrgensen, U. G.; Kains, N.; Kerins, E.; Liebig, C.; Lund, M. N.; Lundkvist, M.; Maier, G.; Mancini, L.; Mathiasen, M.; Penny, M. T.; Rahvar, S.; Ricci, D.; Scarpetta, G.; Skottfelt, J.; Snodgrass, C.; Southworth, J.; Surdej, J.; Tregloan-Reed, J.; Wambsganss, J.; Wertz, O.; Zimmer, F.; Albrow, M. D.; Bachelet, E.; Batista, V.; Brillant, S.; Cassan, A.; Cole, A. A.; Coutures, C.; Dieters, S.; Prester, D. Dominis; Donatowicz, J.; Fouqué, P.; Greenhill, J.; Kubas, D.; Marquette, J. B.; Menzies, J. W.; Sahu, K. C.; Zub, M.; Bramich, D. M.; Horne, K.; Steele, I. A.; Street, R. A.

In: Astrophysical Journal, Vol. 768, No. 2, 129, 10.05.2013.

Research output: Contribution to journalArticle

Choi, JY, Han, C, Udalski, A, Sumi, T, Gaudi, BS, Gould, A, Bennett, DP, Dominik, M, Beaulieu, JP, Tsapras, Y, Bozza, V, Abe, F, Bond, IA, Botzler, CS, Chote, P, Freeman, M, Fukui, A, Furusawa, K, Itow, Y, Ling, CH, Masuda, K, Matsubara, Y, Miyake, N, Muraki, Y, Ohnishi, K, Rattenbury, NJ, Saito, T, Sullivan, DJ, Suzuki, K, Sweatman, WL, Suzuki, D, Takino, S, Tristram, PJ, Wada, K, Yock, PCM, Szymański, MK, Kubiak, M, Pietrzyński, G, Soszyński, I, Skowron, J, Kozłowski, S, Poleski, R, Ulaczyk, K, Wyrzykowski, Pietrukowicz, P, Almeida, LA, Depoy, DL, Dong, S, Gorbikov, E, Jablonski, F, Henderson, CB, Hwang, KH, Janczak, J, Jung, YK, Kaspi, S, Lee, CU, Malamud, U, Maoz, D, Mcgregor, D, Muñoz, JA, Park, BG, Park, H, Pogge, RW, Shvartzvald, Y, Shin, IG, Yee, JC, Al-Subai, K, Browne, P, Burgdorf, MJ, Novati, SC, Dodds, P, Fang, XS, Finet, F, Glitrup, M, Grundahl, F, Gu, SH, Hardis, S, Harpsøe, K, Hinse, TC, Hornstrup, A, Hundertmark, M, Jessen-Hansen, J, Jrgensen, UG, Kains, N, Kerins, E, Liebig, C, Lund, MN, Lundkvist, M, Maier, G, Mancini, L, Mathiasen, M, Penny, MT, Rahvar, S, Ricci, D, Scarpetta, G, Skottfelt, J, Snodgrass, C, Southworth, J, Surdej, J, Tregloan-Reed, J, Wambsganss, J, Wertz, O, Zimmer, F, Albrow, MD, Bachelet, E, Batista, V, Brillant, S, Cassan, A, Cole, AA, Coutures, C, Dieters, S, Prester, DD, Donatowicz, J, Fouqué, P, Greenhill, J, Kubas, D, Marquette, JB, Menzies, JW, Sahu, KC, Zub, M, Bramich, DM, Horne, K, Steele, IA & Street, RA 2013, 'Microlensing discovery of a population of very tight, very low mass binary brown dwarfs', Astrophysical Journal, vol. 768, no. 2, 129. https://doi.org/10.1088/0004-637X/768/2/129
Choi, J. Y. ; Han, C. ; Udalski, A. ; Sumi, T. ; Gaudi, B. S. ; Gould, A. ; Bennett, D. P. ; Dominik, M. ; Beaulieu, J. P. ; Tsapras, Y. ; Bozza, V. ; Abe, F. ; Bond, I. A. ; Botzler, C. S. ; Chote, P. ; Freeman, M. ; Fukui, A. ; Furusawa, K. ; Itow, Y. ; Ling, C. H. ; Masuda, K. ; Matsubara, Y. ; Miyake, N. ; Muraki, Y. ; Ohnishi, K. ; Rattenbury, N. J. ; Saito, To ; Sullivan, D. J. ; Suzuki, K. ; Sweatman, W. L. ; Suzuki, D. ; Takino, S. ; Tristram, P. J. ; Wada, K. ; Yock, P. C M ; Szymański, M. K. ; Kubiak, M. ; Pietrzyński, G. ; Soszyński, I. ; Skowron, J. ; Kozłowski, S. ; Poleski, R. ; Ulaczyk, K. ; Wyrzykowski ; Pietrukowicz, P. ; Almeida, L. A. ; Depoy, D. L. ; Dong, Subo ; Gorbikov, E. ; Jablonski, F. ; Henderson, C. B. ; Hwang, K. H. ; Janczak, J. ; Jung, Y. K. ; Kaspi, S. ; Lee, C. U. ; Malamud, U. ; Maoz, D. ; Mcgregor, D. ; Muñoz, J. A. ; Park, B. G. ; Park, H. ; Pogge, R. W. ; Shvartzvald, Y. ; Shin, I. G. ; Yee, J. C. ; Al-Subai, Khalid ; Browne, P. ; Burgdorf, M. J. ; Novati, S. Calchi ; Dodds, P. ; Fang, X. S. ; Finet, F. ; Glitrup, M. ; Grundahl, F. ; Gu, S. H. ; Hardis, S. ; Harpsøe, K. ; Hinse, T. C. ; Hornstrup, A. ; Hundertmark, M. ; Jessen-Hansen, J. ; Jrgensen, U. G. ; Kains, N. ; Kerins, E. ; Liebig, C. ; Lund, M. N. ; Lundkvist, M. ; Maier, G. ; Mancini, L. ; Mathiasen, M. ; Penny, M. T. ; Rahvar, S. ; Ricci, D. ; Scarpetta, G. ; Skottfelt, J. ; Snodgrass, C. ; Southworth, J. ; Surdej, J. ; Tregloan-Reed, J. ; Wambsganss, J. ; Wertz, O. ; Zimmer, F. ; Albrow, M. D. ; Bachelet, E. ; Batista, V. ; Brillant, S. ; Cassan, A. ; Cole, A. A. ; Coutures, C. ; Dieters, S. ; Prester, D. Dominis ; Donatowicz, J. ; Fouqué, P. ; Greenhill, J. ; Kubas, D. ; Marquette, J. B. ; Menzies, J. W. ; Sahu, K. C. ; Zub, M. ; Bramich, D. M. ; Horne, K. ; Steele, I. A. ; Street, R. A. / Microlensing discovery of a population of very tight, very low mass binary brown dwarfs. In: Astrophysical Journal. 2013 ; Vol. 768, No. 2.
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abstract = "Although many models have been proposed, the physical mechanisms responsible for the formation of low-mass brown dwarfs (BDs) are poorly understood. The multiplicity properties and minimum mass of the BD mass function provide critical empirical diagnostics of these mechanisms. We present the discovery via gravitational microlensing of two very low mass, very tight binary systems. These binaries have directly and precisely measured total system masses of 0.025 M· and 0.034 M·, and projected separations of 0.31 AU and 0.19 AU, making them the lowest-mass and tightest field BD binaries known. The discovery of a population of such binaries indicates that BD binaries can robustly form at least down to masses of 0.02 M·. Future microlensing surveys will measure a mass-selected sample of BD binary systems, which can then be directly compared to similar samples of stellar binaries.",
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TY - JOUR

T1 - Microlensing discovery of a population of very tight, very low mass binary brown dwarfs

AU - Choi, J. Y.

AU - Han, C.

AU - Udalski, A.

AU - Sumi, T.

AU - Gaudi, B. S.

AU - Gould, A.

AU - Bennett, D. P.

AU - Dominik, M.

AU - Beaulieu, J. P.

AU - Tsapras, Y.

AU - Bozza, V.

AU - Abe, F.

AU - Bond, I. A.

AU - Botzler, C. S.

AU - Chote, P.

AU - Freeman, M.

AU - Fukui, A.

AU - Furusawa, K.

AU - Itow, Y.

AU - Ling, C. H.

AU - Masuda, K.

AU - Matsubara, Y.

AU - Miyake, N.

AU - Muraki, Y.

AU - Ohnishi, K.

AU - Rattenbury, N. J.

AU - Saito, To

AU - Sullivan, D. J.

AU - Suzuki, K.

AU - Sweatman, W. L.

AU - Suzuki, D.

AU - Takino, S.

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 - Skowron, J.

AU - Kozłowski, S.

AU - Poleski, R.

AU - Ulaczyk, K.

AU - Wyrzykowski,

AU - Pietrukowicz, P.

AU - Almeida, L. A.

AU - Depoy, D. L.

AU - Dong, Subo

AU - Gorbikov, E.

AU - Jablonski, F.

AU - Henderson, C. B.

AU - Hwang, K. H.

AU - Janczak, J.

AU - Jung, Y. K.

AU - Kaspi, S.

AU - Lee, C. U.

AU - Malamud, U.

AU - Maoz, D.

AU - Mcgregor, D.

AU - Muñoz, J. A.

AU - Park, B. G.

AU - Park, H.

AU - Pogge, R. W.

AU - Shvartzvald, Y.

AU - Shin, I. G.

AU - Yee, J. C.

AU - Al-Subai, Khalid

AU - Browne, P.

AU - Burgdorf, M. J.

AU - Novati, S. Calchi

AU - Dodds, P.

AU - Fang, X. S.

AU - Finet, F.

AU - Glitrup, M.

AU - Grundahl, F.

AU - Gu, S. H.

AU - Hardis, S.

AU - Harpsøe, K.

AU - Hinse, T. C.

AU - Hornstrup, A.

AU - Hundertmark, M.

AU - Jessen-Hansen, J.

AU - Jrgensen, U. G.

AU - Kains, N.

AU - Kerins, E.

AU - Liebig, C.

AU - Lund, M. N.

AU - Lundkvist, M.

AU - Maier, G.

AU - Mancini, L.

AU - Mathiasen, M.

AU - Penny, M. T.

AU - Rahvar, S.

AU - Ricci, D.

AU - Scarpetta, G.

AU - Skottfelt, J.

AU - Snodgrass, C.

AU - Southworth, J.

AU - Surdej, J.

AU - Tregloan-Reed, J.

AU - Wambsganss, J.

AU - Wertz, O.

AU - Zimmer, F.

AU - Albrow, M. D.

AU - Bachelet, E.

AU - Batista, V.

AU - Brillant, S.

AU - Cassan, A.

AU - Cole, A. A.

AU - Coutures, C.

AU - Dieters, S.

AU - Prester, D. Dominis

AU - Donatowicz, J.

AU - Fouqué, P.

AU - Greenhill, J.

AU - Kubas, D.

AU - Marquette, J. B.

AU - Menzies, J. W.

AU - Sahu, K. C.

AU - Zub, M.

AU - Bramich, D. M.

AU - Horne, K.

AU - Steele, I. A.

AU - Street, R. A.

PY - 2013/5/10

Y1 - 2013/5/10

N2 - Although many models have been proposed, the physical mechanisms responsible for the formation of low-mass brown dwarfs (BDs) are poorly understood. The multiplicity properties and minimum mass of the BD mass function provide critical empirical diagnostics of these mechanisms. We present the discovery via gravitational microlensing of two very low mass, very tight binary systems. These binaries have directly and precisely measured total system masses of 0.025 M· and 0.034 M·, and projected separations of 0.31 AU and 0.19 AU, making them the lowest-mass and tightest field BD binaries known. The discovery of a population of such binaries indicates that BD binaries can robustly form at least down to masses of 0.02 M·. Future microlensing surveys will measure a mass-selected sample of BD binary systems, which can then be directly compared to similar samples of stellar binaries.

AB - Although many models have been proposed, the physical mechanisms responsible for the formation of low-mass brown dwarfs (BDs) are poorly understood. The multiplicity properties and minimum mass of the BD mass function provide critical empirical diagnostics of these mechanisms. We present the discovery via gravitational microlensing of two very low mass, very tight binary systems. These binaries have directly and precisely measured total system masses of 0.025 M· and 0.034 M·, and projected separations of 0.31 AU and 0.19 AU, making them the lowest-mass and tightest field BD binaries known. The discovery of a population of such binaries indicates that BD binaries can robustly form at least down to masses of 0.02 M·. Future microlensing surveys will measure a mass-selected sample of BD binary systems, which can then be directly compared to similar samples of stellar binaries.

KW - binaries: general

KW - gravitational lensing: micro

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UR - http://www.scopus.com/inward/citedby.url?scp=84877130988&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/768/2/129

DO - 10.1088/0004-637X/768/2/129

M3 - Article

VL - 768

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 129

ER -