  The circumstellar environments of classical T Tauri stars are challenging to
directly image because of their high star-to-disk contrast ratio. One method to
overcome this is by using imaging polarimetry where scattered and consequently
polarised starlight from the star's circumstellar disk can be separated from
the unpolarised light of the central star. We present images of the
circumstellar environment of SU Aur, a classical T Tauri star at the transition
of T Tauri to Herbig stars. The images directly show that the disk extends out
to ~500 au with an inclination angle of $\sim$ 50$^\circ$. Using interpretive
models, we derived very small grains in the surface layers of its disk, with a
very steep size- and surface-density distribution. Additionally, we resolved a
large and extended nebulosity in our images that is most likely a remnant of
the prenatal molecular cloud. The position angle of the disk, determined
directly from our images, rules out a polar outflow or jet as the cause of this
large-scale nebulosity.
