Optical and IR photometry of OGLE-2017-BLG-0406

At high magnification, the anomaly in the light curve was densely observed by ground-based-survey and follow-up groups, and it was found to be explained by a planetary lens with a planet/host mass ratio of q=7.0x10^-4^ from the light-curve modeling.

The ground-only and Spitzer-"only" data each provide very strong one-dimensional (1D) constraints on the 2D microlens parallax vector {pi}_E_. When combined, these yield a precise measurement of {pi}_E_ and of the masses of the host M_host_=0.56{+/-}0.07M_{sun} and planet M_planet_=0.41{+/-}0.05M_Jup_. The system lies at a distance D_L_=5.2{+/-}0.5 kpc from the Sun toward the Galactic bulge, and the host is more likely to be a disk population star according to the kinematics of the lens.