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; 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. Szymaski; M. Kubiak; G. Pietrzyski; I. Soszyski; J. Skowron; S. Kozowski; 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; K. A. Alsubai; 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; Allan 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

doi:10.1088/0004-637X/768/2/129

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. LingK. 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. Szymaski, M. Kubiak, G. Pietrzyski, I. Soszyski, J. Skowron, S. Kozowski, 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, K. A. Alsubai, 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, Allan 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

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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.

Original language	English
Article number	129
Journal	Astrophysical Journal
Volume	768
Issue number	2
Number of pages	7
ISSN	0004-637X
DOIs	https://doi.org/10.1088/0004-637X/768/2/129
Publication status	Published - 2013

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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., ... Street, R. A. (2013). Microlensing discovery of a population of very tight, very low mass binary brown dwarfs. Astrophysical Journal, 768(2), Article 129. https://doi.org/10.1088/0004-637X/768/2/129

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

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.",

author = "J.-Y. Choi and C. Han and A. Udalski and T. Sumi and Gaudi, {B. S.} and A. Gould and Bennett, {D. P.} and M. Dominik and J.-P. Beaulieu and Y. Tsapras and V. Bozza and F. Abe and Bond, {I. A.} and Botzler, {C. S.} and P. Chote and M. Freeman and A. Fukui and K. Furusawa and Y. Itow and Ling, {C. H.} and K. Masuda and Y. Matsubara and N. Miyake and Y. Muraki and K. Ohnishi and Rattenbury, {N. J.} and To. Saito and Sullivan, {D. J.} and K. Suzuki and Sweatman, {W. L.} and D. Suzuki and S. Takino and Tristram, {P. J.} and K. Wada and Yock, {P. C. M.} and Szymaski, {M. K.} and M. Kubiak and G. Pietrzyski and I. Soszyski and J. Skowron and S. Kozowski and R. Poleski and K. Ulaczyk and . Wyrzykowski and P. Pietrukowicz and Almeida, {L. A.} and DePoy, {D. L.} and Subo Dong and E. Gorbikov and F. Jablonski and Henderson, {C. B.} and K.-H. Hwang and J. Janczak and Y.-K. Jung and S. Kaspi and C.-U. Lee and U. Malamud and D. Maoz and D. McGregor and Mu{\~n}oz, {J. A.} and B.-G. Park and H. Park and Pogge, {R. W.} and Y. Shvartzvald and I.-G. Shin and Yee, {J. C.} and Alsubai, {K. A.} and P. Browne and Burgdorf, {M. J.} and Novati, {S. Calchi} and P. Dodds and X.-S. Fang and F. Finet and M. Glitrup and F. Grundahl and S.-H. Gu and S. Hardis and K. Harps{\o}e and Hinse, {T. C.} and Allan Hornstrup and M. Hundertmark and J. Jessen-Hansen and Jrgensen, {U. G.} and N. Kains and E. Kerins and C. Liebig and Lund, {M. N.} and M. Lundkvist and G. Maier and L. Mancini and M. Mathiasen and Penny, {M. T.} and S. Rahvar and D. Ricci and G. Scarpetta and J. Skottfelt and C. Snodgrass and J. Southworth and J. Surdej and J. Tregloan-Reed and J. Wambsganss and O. Wertz and F. Zimmer and Albrow, {M. D.} and E. Bachelet and V. Batista and S. Brillant and A. Cassan and Cole, {A. A.} and C. Coutures and S. Dieters and Prester, {D. Dominis} and J. Donatowicz and P. Fouqu{\'e} and J. Greenhill and D. Kubas and J.-B. Marquette and Menzies, {J. W.} and Sahu, {K. C.} and M. Zub and Bramich, {D. M.} and K. Horne and Steele, {I. A.} and Street, {R. A.}",

year = "2013",

doi = "10.1088/0004-637X/768/2/129",

language = "English",

volume = "768",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

}

Choi, J-Y, Han, C, Udalski, A, Sumi, T, Gaudi, BS, Gould, A, Bennett, DP, Dominik, M, Beaulieu, J-P, 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, Szymaski, MK, Kubiak, M, Pietrzyski, G, Soszyski, I, Skowron, J, Kozowski, S, Poleski, R, Ulaczyk, K, Wyrzykowski, Pietrukowicz, P, Almeida, LA, DePoy, DL, Dong, S, Gorbikov, E, Jablonski, F, Henderson, CB, Hwang, K-H, Janczak, J, Jung, Y-K, Kaspi, S, Lee, C-U, Malamud, U, Maoz, D, McGregor, D, Muñoz, JA, Park, B-G, Park, H, Pogge, RW, Shvartzvald, Y, Shin, I-G, Yee, JC, Alsubai, KA, Browne, P, Burgdorf, MJ, Novati, SC, Dodds, P, Fang, X-S, Finet, F, Glitrup, M, Grundahl, F, Gu, S-H, 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, J-B, 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

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 - Szymaski, M. K.

AU - Kubiak, M.

AU - Pietrzyski, G.

AU - Soszyski, I.

AU - Skowron, J.

AU - Kozowski, 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 - Alsubai, K. A.

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, Allan

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

Y1 - 2013

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.

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

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

M3 - Journal article

SN - 0004-637X

VL - 768

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 129

ER -

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

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