OGLE-2014-BLG-0962 ( OB140962 ) is a stellar binary microlensing event that was well-covered by observations from the Spitzer satellite as well as ground-based surveys .
Modelling yields a unique physical solution : a mid-M+M-dwarf binary with M _ { prim } = 0.20 \pm 0.01 M _ { \sun } and M _ { sec } = 0.16 \pm 0.01 M _ { \sun } , with projected separation of 2.0 \pm 0.3 AU .
The lens is only D _ { LS } = 0.41 \pm 0.06 kpc in front of the source , making OB140962 a bulge lens and the most distant Spitzer binary lens to date . In contrast , because the Einstein radius ( \theta _ { E } = 0.143 \pm 0.007 mas ) is unusually small , a standard Bayesian analysis , conducted in the absence of parallax information , would predict a brown dwarf binary .
We test the accuracy of Bayesian analysis over a set of Spitzer lenses , finding overall good agreement throughout the sample . We also illustrate the methodology for probing the Galactic distribution of planets by comparing the cumulative distance distribution of the Spitzer 2-body lenses to that of the Spitzer single lenses .