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

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 0.020 M ) and M7 (0.098 0.005 M ) comp...

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Bibliographic Details
Published in:The Astronomical journal 2019-06, Vol.157 (6), p.215
Main Authors: Street, R. A., Bachelet, E., Tsapras, Y., Hundertmark, M. P. G., Bozza, V., Dominik, M., Bramich, D. M., Cassan, A., Horne, K., Mao, S., Saha, A., Wambsganss, J., Zang, Weicheng, 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.
Format: Article
Language:English
Subjects:
Adaptive optics
Astronomy
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
binaries: general
BINARY STARS
COMPARATIVE EVALUATIONS
DWARF STARS
GRAVITATIONAL LENSES
gravitational lensing: micro
Lenses
LUMINOSITY
MASS
Microlenses
OPTICS
Physics
techniques: photometric
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Summary: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 0.020 M ) and M7 (0.098 0.005 M ) 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.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.3847/1538-3881/ab1538