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

Research output: Contribution to journalArticle

  • R. A. Street
  • E. Bachelet
  • Y. Tsapras
  • M. P. G. Hundertmark
  • V. Bozza
  • M. Dominik
  • D. M. Bramich
  • A. Cassan
  • 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
  • J. Southworth
  • J. Tregloan-Reed

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Original languageEnglish
Number of pages23
JournalAstronomical Journal
Publication statusPublished - 7 May 2019


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.

    Research areas

  • astro-ph.EP

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