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Detailed spectropolarimetric studies may hold the key to probing theexplosion mechanisms and the progenitor scenarios of Type Ia supernovae (SNeIa). We present multi-epoch spectropolarimetry and imaging polarimetry of SN2019ein, an SN Ia showing high expansion velocities at early phases. Thespectropolarimetry sequence spans from $\sim -11$ to $+$10 days relative topeak brightness in the $B$-band. We find that the level of the continuumpolarization of SN 2019ein, after subtracting estimated interstellarpolarization, is in the range $0.0-0.3\%$, typical for SNe Ia. The polarizationposition angle remains roughly constant before and after the SN light-curvepeak, implying that the inner regions share the same axisymmetry as the outerlayers. We observe high polarization ($\sim 1\%$) across both the Si II$\lambda6355$ and Ca II near-infrared triplet features. These two lines alsodisplay complex polarization modulations. The spectropolarimetric properties ofSN 2019ein rule out a significant departure from spherical symmetry of theejecta for up to a month after the explosion. These observations disfavourmerger-induced and double-detonation models for SN 2019ein. The imagingpolarimetry shows weak evidence for a modest increase in polarization after$\sim 20$ days since the $B$-band maximum. If this rise is real and is observedin other SNe Ia at similar phases, we may have seen, for the first time, anaspherical interior similar to what has been previously observed for SNe IIP.Future polarization observations of SNe Ia extending to post-peak epochs willhelp to examine the inner structure of the explosion.

Spectropolarimetry of the Type Ia SN 2019ein rules out significant global asphericity of the ejecta