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arxiv 1903.08733 v1 pith:Q7AR6TPF submitted 2019-03-20 astro-ph.EP

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

R.A. Street , E. Bachelet , Y. Tsapras , M.P.G. Hundertmark , V. Bozza , M. Dominik , D.M. Bramich , A. Cassan
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K. Horne S. Mao A. Saha J. Wambsganss Weicheng Zang U.G. Jorgensen P. Longa-Pena 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. Southworth J. Tregloan-Reed
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We report observations of the binary microlensing event OGLE-2018-BLG-0022, provided by the ROME/REA Survey, which indicate that the lens is a low-mass binary star consisting of M3 (0.375+/-0.020 Msun) and M7 (0.098+/-0.005 Msun) 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 AO observations in the near future will be able to provide an independent confirmation of the lens masses.

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