Supernova SN2006gy as a first ever Quark Nova?

TL;DR

This paper proposes that the extremely luminous supernova SN2006gy could be explained by a quark-nova event, involving a delayed explosion inside supernova ejecta, which matches observed lightcurves and suggests a potential first signature of a quark-nova.

Contribution

It introduces a novel model involving quark-nova phenomena to explain superluminous supernovae, providing a better fit to observations than standard models.

Findings

The quark-nova model fits the lightcurve of SN2006gy.

The model successfully explains the luminosity and duration of the supernova.

Application to other supernovae supports the model's validity.

Abstract

The most luminous Supernova SN2006gy (more than a 100 times brighter than a typical supernova) has been a challenge to explain by standard models. For example, pair instability supernovae which are luminous enough seem to have too slow a rise, and core collapse supernovae do not seem to be luminous enough. We present an alternative scenario involving the quark-nova phenomenon (an explosive transition of the newly born neutron star to a quark star) in which a second explosion (delayed) occurs inside the ejecta of a normal supernova. The reheated supernova ejecta can radiate at higher levels for longer periods of time primarily due to reduced adiabatic expansion losses, unlike the standard supernova case. We find an encouraging match between the resulting lightcurve and that observed in the case of SN2006gy suggesting that we might have at hand the first ever signature of a quark-nova. Successful application of our model to SN2005gj and SN2005ap is also presented.