Characterizing microlensing planetary system OGLE-2014-BLG-0676Lb with adaptive optics imaging*

Abstract

Abstract 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 mag and J = 17.76 ± 0.03 mag. 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 M p = 3.68 − 1.44 + 0.69 M J , the planet is likely a “super Jupiter” at a projected separation of r ⊥ = 4.53 − 2.50 + 1.49 AU, and a degenerate model yields a similar M p = 3.73 − 1.47 + 0.73 M J at a closer separation of 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 and we attempt to systematically constrain host properties of this sample with high-resolution imaging to study the distribution of planets.