# Triple Microlens OGLE-2008-BLG-092L: Binary Stellar System with a Circumprimary Uranus-type Planet

 Title Triple Microlens OGLE-2008-BLG-092L: Binary Stellar System with a Circumprimary Uranus-type Planet Publication Type Journal Article Year of Publication 2014 Authors Poleski, R, Skowron, J, Udalski, A, Han, C, Kozłowski, S, Wyrzykowski, Ł, Dong, S, Szymański, M K, Kubiak, M, Pietrzyński, G, Soszyński, I, Ulaczyk, K, Pietrukowicz, P, Gould, A Journal \apj Volume 795 Pagination 42 Keywords binaries: general, gravitational lensing: micro, planets and satellites: detection, planets and satellites: dynamical evolution and stability Abstract {We present the gravitational microlensing discovery of a 4 M $_{Uranus}$ planet that orbits a 0.7 M $_{⊙}$ star at {\ap}18 AU. This is the first known analog of Uranus. Similar planets, i.e., cold ice giants, are inaccessible to either radial velocity or transit methods because of the long orbital periods, while low reflected light prevents direct imaging. We discuss how similar planets may contaminate the sample of the very short microlensing events that are interpreted as free-floating planets with an estimated rate of 1.8 per main-sequence star. Moreover, the host star has a nearby stellar (or brown dwarf) companion. The projected separation of the planet is only about three times smaller than that of the companion star, suggesting significant dynamical interactions. } DOI 10.1088/0004-637X/795/1/42