We report a multiplanetary system found from the analysis of microlensing event OGLE-2018-BLG-1011 , for which the light curve exhibits a double-bump anomaly around the peak .
We find that the anomaly can not be fully explained by the binary-lens or binary-source interpretations and its description requires the introduction of an additional lens component .
The 3L1S ( 3 lens components and a single source ) modeling yields three sets of solutions , in which one set of solutions indicates that the lens is a planetary system in a binary , while the other two sets imply that the lens is a multiplanetary system .
By investigating the fits of the individual models to the detailed light curve structure , we find that the multiple-planet solution with planet-to-host mass ratios \sim 9.5 \times 10 ^ { -3 } and \sim 15 \times 10 ^ { -3 } are favored over the other solutions .
From the Bayesian analysis , we find that the lens is composed of two planets with masses 1.8 ^ { +3..4 } _ { -1.1 } ~ { } M _ { J } and 2.8 ^ { +5.1 } _ { -1.7 } ~ { } M _ { J } around a host with a mass 0.18 ^ { +0.33 } _ { -0.10 } ~ { } M _ { \odot } and located at a distance 7.1 ^ { +1.1 } _ { -1.5 } ~ { } { kpc } .
The estimated distance indicates that the lens is the farthest system among the known multiplanetary systems .
The projected planet-host separations are a _ { \perp, 2 } = 1.8 ^ { +2.1 } _ { -1.5 } ~ { } { au } ( 0.8 ^ { +0.9 } _ { -0.6 } ~ { } { au } ) and a _ { \perp, 3 } = 0.8 ^ { +0.9 } _ { -0.6 } ~ { } { au } , where the values of a _ { \perp, 2 } in and out the parenthesis are the separations corresponding to the two degenerate solutions , indicating that both planets are located beyond the snow line of the host , as with the other four multiplanetary systems previously found by microlensing .