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An understanding of the dynamical evolution of binary star systems, and theireffects on stellar and planetary evolution, requires well-characterized binarypopulations across stellar ages. However, the observational resources requiredto find and characterize binaries are expensive. With the release ofhigh-precision Gaia astrometry, the re-normalized unit weight error (RUWE)statistic has been shown to reveal the presence of binary systems, with RUWEvalues greater than 1.2 indicating the presence of a stellar companion within $\sim 1$". Our goal is to assess whether this new diagnostic, which wasdeveloped for field-age systems ($>$1 Gyr), applies to young systems;specifically, those that host circumstellar disks. With a control sample ofsingle-star systems, compiled from high-contrast imagining surveys of theTaurus and Upper Scorpius star-forming regions, we compare the RUWE values forsystems with and without circumstellar disks. We show that the presence of aprotoplanetary disk alone can result in inflated RUWE values. Based on thedistribution of the RUWE for disk-bearing single stars, we suggest a moreconservative single-star -- binary threshold is warranted in the presence ofdisk material. We place this cutoff at the distribution's 95th percentile, withRUWE $= 2.5$.

Disk Material Inflates Gaia RUWE Values in Single Stars