Characterizing Microlensing Planetary System OGLE-2014-BLG-0676Lb with Adaptive Optics Imaging

We constrain the host-star flux of the microlensing planet OGLE-2014-BLG-0676Lb using adaptive optics (AO) images taken by the Magellan and Keck telescopes. We measure the flux of the light blended with the microlensed source to be K = 16.79 ± 0.04 and J = 17.76 ± 0.03. Assuming that the blend is the lens star, we find that the host is a 0.73-0.29+0.14 M⊙ star at a distance of 2.67-1.41+0.77 kpc, where the relatively large uncertainty in angular Einstein radius measurement is the major source of uncertainty. With mass of Mp = 3.68-1.44+0.69 MJ, the planet is likely a "super Jupiter" at a projected separation of r⊥ = 4.53-2.501.49 AU, and a degenerate model yields a similar Mp = 3.73-1.47+0.73 MJ at a closer separation r⊥ = 2.56-1.41+0.84 AU. Our estimates are consistent with the previous Bayesian analysis based on a Galactic model. OGLE-2014-BLG-0676Lb belongs to a sample of planets discovered in a ''second-generation'' planetary microlensing survey (Shvartzvald et al. 2016), and we attempt to systematically constrain host properties of this sample with high-resolution imaging to study the distribution of planets.