Precise mass measurement of OGLE-2013-BLG-0132/MOA-2013-BLG-148: a Saturn mass planet orbiting an M-dwarf

We revisit the planetary microlensing event OGLE-2013-BLG-0132/MOA-2013-BLG-148 using Keck adaptive optics imaging in 2013 with NIRC2 and in 2020, 7.4 years after the event, with OSIRIS. The 2020 observations yield a source and lens separation of 56.91 ± 0.29 mas, which provides us with a precise measurement of the heliocentric proper motion of the event μ_rel,hel = 7.695 ± 0.039 mas yr^-1. We measured the magnitude of the lens in K-band as K_lens = 18.69 ± 0.04. Using these constraints, we refit the microlensing light curve and undertake a full reanalysis of the event parameters including the microlensing parallax π_E and the distance to the source D_S. We confirm the results obtained in the initial study by and improve significantly upon the accuracy of the physical parameters. The system is an M dwarf of 0.495 ± 0.054 M_⊙ orbited by a cold, Saturn-mass planet of 0.26 ± 0.028 M_Jup at projected separation r_⊥ = 3.14 ± 0.28 AU. This work confirms that the planetary system is at a distance of 3.48 ± 0.36 kpc, which places it in the Galactic disk and not the Galactic bulge.