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 ( KMTNet ) alone .
The time scale of this event is t _ { E } = 40.0 \pm 0.5 days and the mass ratio between the lens star and its companion is q = 0.016 \pm 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 \rho , a Bayesian analysis yields the lens mass M _ { L } = 0.45 _ { -0.28 } ^ { +0.33 } ~ { } M _ { \odot } , at distance of D _ { L } = 6.60 _ { -1.30 } ^ { +1.10 } kpc .
Thus the companion is a super-Jupiter of a mass m _ { p } = 7.0 _ { -4.3 } ^ { +5.2 } ~ { } M _ { J } , at a projected separation r _ { \perp } = 5.1 _ { -1.7 } ^ { +1.5 } AU , indicating that the planet is well beyond the snow line of the host star .