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Aims: We study possible signs of asymmetry in the luminous Type IIn SN2010jl,to obtain independent information on the explosion geometry. Methods: Weobtained optical linear spectropolarimetry of SN2010jl two weeks after thediscovery, in the spectral range 3700-8800 A. Results: The object exhibits acontinuum polarization at a very significant and almost constant level(1.7-2.0%). Marked line depolarization is seen at the positions of thestrongest emission features, like Halpha and Hbeta. This implies that the lineforming region is well above the photosphere. The continuum polarization level(1.7-2.0%) indicates a substantial asphericity, of axial ratio <=0.7. Thealmost complete depolarization seen at Halpha suggests a very low level ofinterstellar polarization (<=0.3%). This rules out the presence of relevantamounts of dust in the progenitor environment at the time of our observations.From a polarimetric point of view, SN2010jl appears to be very similar to thetwo other well studied Type IIn SNe 1997eg and 1998S, establishing a stronglink within this class of objects.

Asymmetries in the Type IIn SN2010jl