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We present H and K band imaging polarimetry for the PDS 66 circumstellar diskobtained during the commissioning of the Gemini Planet Imager (GPI).Polarization images reveal a clear detection of the disk in to the 0.12'' innerworking angle (IWA) in H band, almost 3 times as close to the star as theprevious HST observations with NICMOS and STIS (0.35'' effective IWA). Thecentro-symmetric polarization vectors confirm that the bright inner diskdetection is due to circumstellar scattered light. A more diffuse disk extendsto a bright outer ring centered at 80 AU. We discuss several physicalmechanisms capable of producing the observed ring + gap structure. GPI dataconfirm enhanced scattering on the East side of the disk which is inferred tobe nearer to us. We also detect a lateral asymmetry in the South possibly dueto shadowing from material within the inner working angle. This likelycorresponds to a temporally variable azimuthal asymmetry observed in HST/STIScoronagraphic imaging.

The PDS 66 Circumstellar Disk as seen in Polarized Light with the Gemini Planet Imager