OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through Planetary-Caustic Channel

Abstract

We present the analyses of two microlensing events, OGLE-2018-BLG-0567 and OGLE-2018-BLG-0962. In both events, the short-lasting anomalies were densely and continuously covered by two high-cadence surveys. The light-curve modeling indicates that the anomalies are generated by source crossings over the planetary caustics induced by planetary companions to the hosts. The estimated planet/host separation (scaled to the angular Einstein radius $\hat{I}{¸}_{\mathrm{E}}$) and mass ratio are $(s,q)=(1.81,1.24\times 10^{-3})$ and $(s,q)=(1.25,2.38\times 10^{-3})$, respectively. From Bayesian analyses, we estimate the host and planet masses as $(M_{\mathrm{h}},M_{\mathrm{p}})=(0.24_{-0.13}^{+0.16}{M}_{\odot },0.32_{-0.16}^{+0.34}{M}_{\mathrm{J}})$ and $(M_{\mathrm{h}},M_{\mathrm{p}})=(0.55_{-0.29}^{+0.32}{M}_{\odot },1.37_{-0.72}^{+0.80}{M}_{\mathrm{J}})$, respectively. These planetary systems are located at a distance of $7.07_{-1.15}^{+0.93}\mathrm{kpc}$ for OGLE-2018-BLG-0567 and $6.47_{-1.73}^{+1.04}\mathrm{kpc}$ for OGLE-2018-BLG-0962, suggesting that they are likely to be near the Galactic bulge. The two events prove the capability of current high-cadence surveys for finding planets through the planetary-caustic channel. We find that most published planetary-caustic planets are found in Hollywood events in which the source size strongly contributes to the anomaly cross section relative to the size of the caustic.

25 pages, 8 figures, 4 tables, submitted to AAS journal