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

Imaging the circumstellar environment of the young T Tauri star SU Aurigae