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We report the discovery of a Jupiter-mass planet orbiting an M-dwarf starthat gave rise to the microlensing event OGLE-2011-BLG-0265. Such a system isvery rare among known planetary systems and thus the discovery is important fortheoretical studies of planetary formation and evolution. High-cadence temporalcoverage of the planetary signal combined with extended observations throughoutthe event allows us to accurately model the observed light curve. The finalmicrolensing solution remains, however, degenerate yielding two possibleconfigurations of the planet and the host star. In the case of the preferredsolution, the mass of the planet is $M_{\rm p} = 0.9\pm 0.3\ M_{\rm J}$, andthe planet is orbiting a star with a mass $M = 0.22\pm 0.06\ M_\odot$. Thesecond possible configuration (2$\sigma$ away) consists of a planet with$M_{\rm p}=0.6\pm 0.3\ M_{\rm J}$ and host star with $M=0.14\pm 0.06\ M_\odot$.The system is located in the Galactic disk 3 -- 4 kpc towards the Galacticbulge. In both cases, with an orbit size of 1.5 -- 2.0 AU, the planet is a"cold Jupiter" -- located well beyond the "snow line" of the host star.Currently available data make the secure selection of the correct solutiondifficult, but there are prospects for lifting the degeneracy with additionalfollow-up observations in the future, when the lens and source star separate.

OGLE-2011-BLG-0265Lb: a Jovian Microlensing Planet Orbiting an M Dwarf