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 M _ { 1 } \sim 0.05 M _ { \odot } , M _ { 2 } \sim 0.01 M _ { \odot } , and distance D _ { L } \sim 4.5 kpc , as well as the projected separation a _ { \perp } \sim 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 .