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We present accretion disk size measurements for 15 luminous quasars at $0.7\leq z \leq 1.9$ derived from $griz$ light curves from the Dark Energy Survey.We measure the disk sizes with continuum reverberation mapping using twomethods, both of which are derived from the expectation that accretion diskshave a radial temperature gradient and the continuum emission at a given radiusis well-described by a single blackbody. In the first method we measure therelative lags between the multiband light curves, which provides the relativetime lag between shorter and longer wavelength variations. From this, we areonly able to constrain upper limits on disk sizes, as many are consistent withno lag the 2$\sigma$ level. The second method fits the model parameters for thecanonical thin disk directly rather than solving for the individual time lagsbetween the light curves. Our measurements demonstrate good agreement with thesizes predicted by this model for accretion rates between 0.3-1 times theEddington rate. Given our large uncertainties, our measurements are alsoconsistent with disk size measurements from gravitational microlensing studiesof strongly lensed quasars, as well as other photometric reverberation mappingresults, that find disk sizes that are a factor of a few ($\sim$3) larger thanpredictions.

Quasar Accretion Disk Sizes From Continuum Reverberation Mapping From the Dark Energy Survey