We present the analysis of OGLE-2016-BLG-0613, for which the lensing light curve appears to be that of a typical binary-lens event with two caustic spikes but with a discontinuous feature on the trough between the spikes. We find that the discontinuous feature was produced by a planetary companion to the binary lens. We find 4 degenerate triple-lens solution classes, each composed of a pair of solutions according to the well-known wide/close planetary degeneracy. One of these solution classes is excluded due to its relatively poor fit. For the remaining three pairs of solutions, the most-likely primary mass is about M1∼0.7M⊙ while the planet is a super-Jupiter. In all cases the system lies in the Galactic disk, about half-way toward the Galactic bulge. However, in one of these three solution classes, the secondary of the binary system is a low-mass brown dwarf, with relative mass ratios (1 : 0.03 : 0.003), while in the two others the masses of the binary components are comparable. These two possibilities can be distinguished in about 2024 when the measured lens-source relative proper motion will permit separate resolution of the lens and source.
@article{arxiv.1710.00924,
title = {OGLE-2016-BLG-0613LABb: A Microlensing Planet in a Binary System},
author = {C. Han and A. Udalski and A. Gould and C. -U. Lee and Y. Shvartzvald and W. C. Zang and S. Mao and S. Kozłowski and M. D. Albrow and S. -J. Chung and K. -H. Hwang and Y. K. Jung and D. Kim and H. -W. Kim and Y. -H. Ryu and I. -G. Shin and J. C. Yee and W. Zhu and S. -M. Cha and S. -L. Kim and D. -J. Kim and Y. Lee and B. -G. Park and J. Skowron and P. Mróz and P. Pietrukowicz and R. Poleski and M. K. Szymański and I. Soszyński and K. Ulaczyk and M. Pawlak C. Beichman and G. Bryden and S. Calchi Novati and B. S. Gaudi and C. B. Henderson and S. B. Howell and S. Jacklin and M. T. Penny and P. Fouqué and T. S. Wang},
journal= {arXiv preprint arXiv:1710.00924},
year = {2017}
}