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OGLE-2018-BLG-0022: A Nearby M-dwarf Binary

Street, R.A.; Bachelet, E.; Tsapras, Y.; Hundertmark, M.P.G.; Bozza, V.; Dominik, M.; REA, ROME; Teams, MiNDSTEp; Team, ROME/REA; Bramich, D.M.; Cassan, A.; Horne, K.; Mao, S.; Saha, A.; Wambsganss, J.; Zang, Weicheng; Team, MiNDSTEp; Jørgensen, U.G.; Longa-Peña, P.; Peixinho, N.; Sajadian, S.; Burgdorf, M.J.; Campbell-White, J.; Dib, S.; Evans, D.F.; Fujii, Y.I.; Hinse, T.C.; Khalouei, E.; Lowry, S.; Rahvar, S.; Rabus, M.; Skottfelt, J.; Snodgrass, C.; Southworth, J.; Tregloan-Reed, J.

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R.A. Street

E. Bachelet

Y. Tsapras

M.P.G. Hundertmark

V. Bozza

M. Dominik


MiNDSTEp Teams


D.M. Bramich

A. Cassan

K. Horne

S. Mao

A. Saha

J. Wambsganss

Weicheng Zang


U.G. Jørgensen

P. Longa-Peña

N. Peixinho

S. Sajadian

M.J. Burgdorf

J. Campbell-White

S. Dib

D.F. Evans

Y.I. Fujii

T.C. Hinse

E. Khalouei

S. Lowry

S. Rahvar

M. Rabus

J. Skottfelt

C. Snodgrass

J. Tregloan-Reed


We report observations of the binary microlensing event OGLE-2018-BLG-0022, provided by the Robotic Observations of Microlensing Events (ROME)/Reactive Event Assessment (REA) Survey, which indicate that the lens is a low-mass binary star consisting of M3 (0.375?±?0.020Me) and M7 (0.098?±?0.005Me) components. The lens is unusually close, at 0.998?±?0.047 kpc, compared with the majority of microlensing events, and despite its intrinsically low luminosity, it is likely that adaptive optics observations in the near future will be able to provide an independent confirmation of the lens masses.


Street, R., Bachelet, E., Tsapras, Y., Hundertmark, M., Bozza, V., Dominik, M., …Tregloan-Reed, J. (2019). OGLE-2018-BLG-0022: A Nearby M-dwarf Binary. Astronomical Journal, 157(6), Article 215.

Journal Article Type Article
Acceptance Date Mar 14, 2019
Online Publication Date May 7, 2019
Publication Date May 7, 2019
Journal Astronomical Journal
Print ISSN 0004-6256
Electronic ISSN 1538-3881
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 157
Issue 6
Article Number 215
Keywords binaries, general, gravitational lensing, micro, techniques, photometric
Publisher URL


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