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Origin of enigmatic line profiles of extremely luminous type IIn supernovaSN~2006gy on day 96 is explored. Among conceivable possibilities the mostpreferred is the model that suggests holes in the optically thick cool denseshell (CDS). The line radiation emitted at the inner side of the opaque CDSescapes through the holes thus producing unusual line profile with the emissionshifted redward. The holes could emerge as a result of a vigorousRayleigh-Taylor instability leading to the CDS fragmentation. The model lightcurve with the CDS fragmentation is shown to be consistent with the SN~2006gybolometric light curve.

Explaining unusual line profiles of SN 2006gy