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To obtain accurate mass measurements for cold planets discovered bymicrolensing, it is usually necessary to combine light curve modeling with atleast two lens mass-distance relations. Often, a constraint on the Einsteinring radius measurement is obtained from the caustic crossing time: This issupplemented by secondary constraints such as precise parallax measurementsand/or measures of the lens luminosity using high angular resolutionobservations. We resolved the source+lens star from sub-arcsecond blends in Hband using adaptive optics (AO) observations with NIRC2 mounted on Keck IItelescope. We identify additional flux, coincident with the source to within160 mas. We estimate the potential contributions to this blended light(chance-aligned star, additional companion to the lens or to the source) andfind that 85 % of of the NIR flux is due to the lens star at H_L=16.63 +- 0.06and K_L=16.46 +- 0.06. We combined the parallax constraint and the AOconstraint to derive the physical parameters of the system. The lensing systemis composed of a mid-late type G main sequence star of M_L=0.89 +- 0.05 Molocated at D_L = 3.6 +- 0.3 kpc in the Galactic disk. Taking the mass ratio andprojected separation from the original study leads to a planet of M_p= 0.64 +-0.044 M_Jupiter at 3.48 +- 0.22 AU. Excellent parallax measurement fromsimultaneous ground-space observations have been obtained on the microlensingevent OGLE-2014-BLG-0124, but it is only when they are combined with ~ 30 minof Keck II AO observations that the physical parameters of the host star arewell measured.

the astronomical journal

Combining Spitzer parallax and Keck II adaptive optics imaging to  measure the mass of a solar-like star orbited by a cold gaseous planet  discovered by microlensing