摘要：We report the discovery of a giant planet in the KMT-2016-BLG-1397 microlensing event, which was found by The Korea Microlensing Telescope Network alone. The timescale of this event is t E =40.0±0.5 days, and the mass ratio between the lens star and its companion is q=0.016±0.002. The planetary perturbation in the light curve is a smooth bump, resulting in the classical binary-lens/binary-source (2L1S/1L2S) degeneracy. We measure the V−I color of the (putative) two sources in the 1L2S model, and then effectively rule out the binary-source solution. The finite-source effect is marginally detected. Combined with the limits on the blend flux and the probability distribution of the source size normalized by the Einstein radius ρ, a Bayesian analysis yields the lens mass M M 0.45 L 0.28 0.33 = - + , at distance of D 6.60 L 1.30 1.10 = - + kpc. Thus, the companion is a super-Jupiter of a mass m M 7.0 p J 4.3 5.2 = - + , at a projected separation r 5.1 1.7 1.5 = ^ - + au, indicating that the planet is well beyond the snow line of the host star.
关键词：gravitational lensing: micro;planets and satellites: detection;stars: individual (KMT-2016- BLG-1397)
