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We report the results of a ${\sim}4$-year direct imaging survey of 104 starsto resolve and characterize circumstellar debris disks in scattered light aspart of the Gemini Planet Imager Exoplanet Survey. We targeted nearby(${\lesssim}150$ pc), young (${\lesssim}500$ Myr) stars with high infraredexcesses ($L_{\mathrm{IR}} / L_\star > 10^{-5}$), including 38 with previouslyresolved disks. Observations were made using the Gemini Planet Imagerhigh-contrast integral field spectrograph in $H$-band (1.6 $\mu$m)coronagraphic polarimetry mode to measure both polarized and total intensities.We resolved 26 debris disks and three protoplanetary/transitional disks. Sevendebris disks were resolved in scattered light for the first time, includingnewly presented HD 117214 and HD 156623, and we quantified basic morphologiesof five of them using radiative transfer models. All of our detected debrisdisks but HD 156623 have dust-poor inner holes, and their scattered-light radiiare generally larger than corresponding radii measured from resolved thermalemission and those inferred from spectral energy distributions. To assesssensitivity, we report contrasts and consider causes of non-detections.Detections were strongly correlated with high IR excess and high inclination,although polarimetry outperformed total intensity angular differential imagingfor detecting low inclination disks (${\lesssim} 70 \deg$). Based onpost-survey statistics, we improved upon our pre-survey target prioritizationmetric predicting polarimetric disk detectability. We also examinedscattered-light disks in the contexts of gas, far-IR, and millimeterdetections. Comparing $H$-band and ALMA fluxes for two disks revealed tentativeevidence for differing grain properties. Finally, we found no preference fordebris disks to be detected in scattered light if wide-separation substellarcompanions were present.

Debris Disk Results from the Gemini Planet Imager Exoplanet Survey's Polarimetric Imaging Campaign