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 $M_1\sim 0.05M_{\odot }$, $M_2\sim 0.01M_{\odot }$, and distance $D_{\mathrm{L}}\sim 4.5$ 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.

8 pages, 8 figures

References in corpus (4)

• The properties of brown dwarfs and low-mass hydrogen-burning stars formed by disc fragmentation
• Extended-Source Effect and Chromaticity in Two-Point-Mass Microlensing
• Hexadecapole Approximation in Planetary Microlensing
• Gravitational lens under perturbations: Symmetry of perturbing potentials with invariant caustics

Cited by in corpus (2)

• Spitzer Microlensing of MOA-2016-BLG-231L : A Counter-Rotating Brown Dwarf Binary in the Galactic Disk
• OGLE-2013-BLG-0911Lb: A Secondary on the Brown-Dwarf Planet Boundary around an M-dwarf