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We present astrometric monitoring of the young exoplanet HD 95086 b obtainedwith the Gemini Planet Imager between 2013 and 2016. A small but significantposition angle change is detected at constant separation; the orbital motion isconfirmed with literature measurements. Efficient Monte Carlo techniques placepreliminary constraints on the orbital parameters of HD 95086 b. With 68%confidence, a semimajor axis of 61.7^{+20.7}_{-8.4} au and an inclination of153.0^{+9.7}_{-13.5} deg are favored, with eccentricity less than 0.21. Underthe assumption of a co-planar planet-disk system, the periastron of HD 95086 bis beyond 51 au with 68% confidence. Therefore HD 95086 b cannot carve theentire gap inferred from the measured infrared excess in the SED of HD 95086.We use our sensitivity to additional planets to discuss specific scenariospresented in the literature to explain the geometry of the debris belts. Wesuggest that either two planets on moderately eccentric orbits or three to fourplanets with inhomogeneous masses and orbital properties are possible. Thesensitivity to additional planetary companions within the observationspresented in this study can be used to help further constrain future dynamicalsimulations of the planet-disk system.

Constraints on the architecture of the HD 95086 planetary system with the Gemini Planet Imager