Abstract
We report the characterization of a massive (m p = 3:9±1:4M jup ) microlensing planet (OGLE-2015-BLG-0954Lb) orbiting an M dwarf host (M = 0:33 0:12M ⊙ ) at a distance toward the Galactic bulge of 0:6 +0.4 -0.2 kpc, which is extremely nearby by microlensing standards. The planet-host projected separation is a⊥~ 1.2AU. The characterization was made possible by the wide-feld (4 deg 2 ) high cadence(Ґ = 6 hr -1 ) monitoring of the Korea Microlensing Telescope Network (KMTNet), which had two of its three telescopes in commissioning operations at the time of the planetary anomaly. The source crossing time t * = 16 min is among the shortest ever published. The high-cadence, wide-eld observations that are the hallmark of KMTNet are the only way to routinely capture such short crossings. High-cadence resolution of short caustic crossings will preferentially lead to mass and distance measurements for the lens. This is because the short crossing time typically implies a nearby lens, which enables the measurement of additional effects (bright lens and/or microlens parallax). When combined with the measured crossing time, these eects can yield planet/host masses and distance.
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