Explaining unusual line profiles of SN 2006gy

TL;DR

This paper investigates the unusual spectral line profiles of the luminous supernova SN 2006gy, proposing that holes in the dense shell caused by instabilities explain the observed features and match the light curve.

Contribution

It introduces a model where holes in the cool dense shell caused by Rayleigh-Taylor instability explain the line profiles and light curve of SN 2006gy.

Findings

Holes in the CDS can produce redshifted emission profiles.

The model with CDS fragmentation fits the observed light curve.

Rayleigh-Taylor instability likely causes the CDS holes.

Abstract

Origin of enigmatic line profiles of extremely luminous type IIn supernova SN~2006gy on day 96 is explored. Among conceivable possibilities the most preferred is the model that suggests holes in the optically thick cool dense shell (CDS). The line radiation emitted at the inner side of the opaque CDS escapes through the holes thus producing unusual line profile with the emission shifted redward. The holes could emerge as a result of a vigorous Rayleigh-Taylor instability leading to the CDS fragmentation. The model light curve with the CDS fragmentation is shown to be consistent with the SN~2006gy bolometric light curve.