Abstract
Classical T Tauri stars are encircled by accretion discs most of the time unresolved by conventional imaging observation. However, numerical simulations show that unresolved aperture linear polarimetry can be used to extract information about the geometry of the immediate circumstellar medium that scatter the starlight. Monin et al. (1998, AA 2004, ApJ, 600, 789), Wolf et al. (2001, Pre-main sequence binaries with aligned discs?, in The formation of Binary Stars, ed. H. Zinnecker, & R. D. Mathieu, IAU Symp., 200, 295). However, we also find a few systems showing large differences in polarisation level, possibly indicating different inclinations to the line-of-sight for their discs.
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