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We analyze the combined Spitzer and ground-based data for OGLE-2017-BLG-1140and show that the event was generated by a Jupiter-class $(m_p\simeq1.6\,M_{\rm jup})$ planet orbiting a mid-late M dwarf $(M\simeq 0.2\,M_\odot)$that lies $D_{LS}\simeq 1.0\,\mathrm{kpc}$ in the foreground of themicrolensed, Galactic-bar, source star. The planet-host projected separation is$a_\perp \simeq 1.0\,\mathrm{au}$, i.e., well-beyond the snow line. Bymeasuring the source proper motion ${\mathbf{\mu}}_s$ from ongoing, long-termOGLE imaging, and combining this with the lens-source relative proper motion${\mathbf{\mu}}_\mathrm{rel}$ derived from the microlensing solution, we showthat the lens proper motion ${\mathbf{\mu}}_l={\mathbf{\mu}}_\mathrm{rel} +{\mathbf{\mu}}_s$ is consistent with the lens lying in the Galactic disk,although a bulge lens is not ruled out. We show that while the Spitzer andground-based data are comparably well fitted by planetary (i.e., binary-lens,2L1S) models and by binary-source (1L2S) models, the combination of Spitzer andground-based data decisively favor the planetary model. This is a new channelto resolve the 2L1S/1L2S degeneracy, which can be difficult to break in somecases.

Spitzer Opens New Path to Break Classic Degeneracy for Jupiter-Mass Microlensing Planet OGLE-2017-BLG-1140Lb