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, Ł.; 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.; Alsubai, K. A.; 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.; The MOA Collaboration; The OGLE Collaboration; The μFUN Collaboration; The MiNDSTEp Consortium; The PLANET Collaboration; The RoboNet Collaboration

doi: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, Ł.; 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.; Alsubai, K. A.; Browne, P.; Burgdorf, M. J.; Novati, S. Calchi; Dodds, P.; Fang, X.-S.; Finet, F.; Glitrup, M...

Authors

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. Szymański

M. Kubiak

G. Pietrzyński

I. Soszyński

J. Skowron

S. Kozłowski

R. Poleski

K. Ulaczyk

Ł. 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

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

Dr John Taylor j.k.taylor@keele.ac.uk

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

The MOA Collaboration

The OGLE Collaboration

The μFUN Collaboration

The MiNDSTEp Consortium

The PLANET Collaboration

The RoboNet Collaboration

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.

Citation

Choi, J., Han, C., Udalski, A., Sumi, T., Gaudi, B. S., Gould, A., …The RoboNet Collaboration. (in press). 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

Journal Article Type	Article
Acceptance Date	Mar 22, 2013
Online Publication Date	Apr 23, 2013
Deposit Date	Jun 16, 2023
Journal	The Astrophysical Journal
Print ISSN	0004-637X
Electronic ISSN	1538-4357
Publisher	American Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	768
Issue	2
Article Number	129
DOI	https://doi.org/10.1088/0004-637x/768/2/129
Keywords	Space and Planetary Science; Astronomy and Astrophysics

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