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    • Super Nova

    OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-Peak Gravitational Microlensing Event

    We present the analysis of the binary-microlensing event OGLE-2014-BLG-0289. The event light curve exhibits very unusual five peaks where four peaks were produced by caustic crossings and the other peak was produced by a cusp approach. It is found that the quintuple-peak features of the light curve provide tight constraints on the source trajectory, enabling us to precisely and accurately measure the microlensing parallax πE. Furthermore, the three resolved caustics allow us to measure the angular Einstein radius θE. From the combination of πE and θE, the physical lens parameters are uniquely determined. It is found that the lens is a binary composed of two M dwarfs with masses M1 = 0.52±0.04 M and M2=0.42±0.03 M separated in projection by a = 6.4±0.5 au. The lens is located in the disk with a distance of DL = 3.3±0.3 kpc. It turns out that the reason for the absence of a lensing signal in the Spitzer data is that the time of observation corresponds to the flat region of the light curve.

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