KMT-2025-BLG-0975Lb and KMT-2025-BLG-1160Lb: Two Uranus-Mass Planets Beyond the Snow Line Discovered by Microlensing

We present the analysis of two planetary microlensing events, KMT-2025-BLG-0975 and KMT-2025-BLG-1160, discovered during the 2025 Galactic bulge microlensing season through high-cadence survey observations. In both events, short-duration anomalies near the peaks of the lensing light curves reveal the presence of planetary companions. Light-curve modeling yields planet-to-host mass ratios of q = 8.6 times 10-4 for KMT-2025-BLG-0975 and 1.3 times 10-4 for KMT-2025-BLG-1160. For KMT-2025-BLG-0975, finite-source effects are detected, enabling a measurement of the angular Einstein radius, whereas only a lower limit on this quantity is obtained for KMT-2025-BLG-1160. We estimate the physical parameters of the lens systems through Bayesian analyses constrained by the measured microlensing observables. The results indicate that the planetary companions have masses of M p=29.8+50.5-16.0 M for KMT-2025-BLG-0975Lb and 25.4+15.5-14.1 M for KMT-2025-BLG-1160Lb. Both planets have masses comparable to that of Uranus. The host stars are inferred to be a low-mass M dwarf with a mass of M h=0.10+0.18-0.06 M for KMT-2025-BLG-0975L and a late K dwarf with a mass of M h=0.58+0.35-0.32 M for KMT-2025-BLG-1160L. The projected planet--host separations are a=0.81+0.10-0.11 au for KMT-2025-BLG-0975Lb and a=2.56+0.48-0.71 au and 3.29+0.61-0.92 au for the inner and wide solutions, respectively, of KMT-2025-BLG-1160Lb. In both systems, the planets are located beyond the expected snow-line distances of their hosts, placing them in the cold ice-giant regime.