OGLE-2018-BLG-1428Lb: a Jupiter-mass planet beyond the snow line of a dwarf star

ABSTRACT We present the analysis of microlensing event OGLE-2018-BLG-1428, which has a short-duration (∼1 d) caustic-crossing anomaly. The was caused by planetary lens system with planet/host mass ratio q = 1.7 × 10−3. Because detection anomaly, finite source effect well measured, but microlens parallax not constrained due to relatively short time-scale (tE 24 d). From Bayesian analysis, we find that host star is dwarf $M_{\rm host}=0.43^{+0.33}_{-0.22} \ \mathrm{M}_{\odot }$ at distance $D_{\rm L}=6.22^{+1.03}_{-1.51}\ {\rm kpc}$ and planet Jovian-mass p}=0.77^{+0.77}_{-0.53} M_{\rm J}$ projected separation $a_{\perp }=3.30^{+0.59}_{-0.83}\ au}$. orbits beyond snow line star. Considering relative lens-source proper motion $\mu _{\rm rel} 5.58 \pm 0.38\ \rm mas\ yr^{-1}$, can be resolved adaptive optics 30 m telescope in future.