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The Gemini Planet Imager (GPI) has been designed for the direct detection andcharacterization of exoplanets and circumstellar disks. GPI is equipped with adual channel polarimetry mode designed to take advantage of the inherentlypolarized light scattered off circumstellar material to further suppress theresidual seeing halo left uncorrected by the adaptive optics. We explore howrecent advances in data reduction techniques reduce systematics and improve theachievable contrast in polarimetry mode. In particular, we consider differentflux extraction techniques when constructing datacubes from raw data, divisionby a polarized flat-field and a method for subtracting instrumentalpolarization. Using observations of unpolarized standard stars we find thatGPI's instrumental polarization is consistent with being wavelength independentwithin our errors. In addition, we provide polarimetry contrast curves thatdemonstrate typical performance throughout the GPIES campaign.

Gemini Planet Imager Observational Calibrations XIV: Polarimetric Contrasts and New Data Reduction Techniques