OGLE-2018-BLG-0022 : a nearby M-dwarf binary
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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.
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 , W , 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 2019 , ' OGLE-2018-BLG-0022 : a nearby M-dwarf binary ' , Astronomical Journal , vol. 157 , no. 6 , 215 . https://doi.org/10.3847/1538-3881/ab1538
© 2019, American Astronomical Society. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3847/1538-3881/ab1538
DescriptionFunding: UK STFC grant ST/R000824/1 (KH).
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