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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.; 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. and Tregloan-Reed, J. (2019). OGLE-2018-BLG-0022: A Nearby M-dwarf Binary. The Astronomical Journal, 157(6), article no. 215.

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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.

Item Type: Journal Item
Copyright Holders: 2019 The American Astronomical Society
ISSN: 1538-3881
Keywords: general binaries; micro gravitational lensing; photometric techniques
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 61398
Depositing User: ORO Import
Date Deposited: 22 May 2019 08:26
Last Modified: 30 Sep 2019 08:57
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