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

Abstract

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

arXiv comment12 pages, 6 figures, accepted in MNRAS

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