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Over the past 30 years, spectropolarimetry has proven to be a great tool toprobe the 3D geometry of core collapse supernovae (CCSNe). The number ofhigh-quality multi-epoch spectropolarimetric data sets for CCSNe remains quitelow, however, due to the challenging nature of such observations. In thisThesis we present and analyse the data of two Type IIb SNe (SN 2008aq - twoepochs, SN 2011hs - seven epochs) and one Type Ic-bl (SN 2014ad - sevenepochs). The latter is the most complete spectropolarimetric data set for aType Ic-bl to date. We also provide a preliminary re-analysis of thespectropolarimetric data of SN 1993J. The new datasets demonstrate that thespectropolarimetry of stripped envelope supernovae is complex and varied, andalthough early studies of type IIb SNe showed similar behaviour to type IIP, itis now clear that this early trend is broken by a growing sample of SNe.Additionally, we identified potential signatures of a jet in SN 2014ad.Furthermore, a toy model to simulate spectropolarimetry from simple geometries(similar to Reilly et al. 2016) was created. A systematic approach to parameterspace exploration was developped; this showed that unfortunately these modelssuffer extreme degeneracies and may not lead to accurate interpretations.Finally, spectropolarimetry can also be used to probe asymmetries caused byfast rotation in the potential progenitors of stripped envelope CCSNe. Althoughnumerous Wolf-Rayet stars of type WN and WC have been observed withspectropolarimetry, no single WO stars have been studied to date. In our dataof two Galactic WO stars, we found no line effect and could not sufficientlyconstrain the rotational velocity to exclude a collapsar scenario. Therefore,the absence of a line effect may not necessarily equate to a low rotationalvelocity.

Spectropolarimetry of stripped envelope core collapse supernovae and their progenitors