OGLE-2016-BLG-1469L: Microlensing Binary Composed of Brown Dwarfs
Abstract
We report the discovery of a binary composed of two brown dwarfs, based on the analysis of the microlensing event OGLE-2016-BLG-1469. Thanks to detection of both finite-source and microlens-parallax effects, we are able to measure both the masses M1 0.05\ M, M2 0.01\ M, and distance D L 4.5 kpc, as well as the projected separation a 0.33 au. This is the third brown-dwarf binary detected using the microlensing method, demonstrating the usefulness of microlensing in detecting field brown-dwarf binaries with separations less than 1 au.
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