Gamma-ray burst supernovae as standardizable candles

TL;DR

This paper investigates whether gamma-ray burst supernovae can be standardized as candles for cosmological measurements, finding a significant brightness-width relation and suggesting potential for broader supernova standardization.

Contribution

It provides evidence that GRB-SNe follow a brightness-width relation, supporting their use as standardizable candles, and proposes a possible underlying physical explanation.

Findings

GRB-SNe follow a brightness-width relation.

All nearby spectroscopically identified GRB-SNe adhere to this relation.

Potential for other supernovae powered by a central engine to be standardizable.

Abstract

A long-duration gamma-ray burst (GRB) marks the violent end of a massive star. GRBs are rare in the universe, and their progenitor stars are thought to possess unique physical properties such as low metal content and rapid rotation, while the supernovae (SNe) that are associated with GRBs are expected to be highly aspherical. To date, it has been unclear whether GRB-SNe could be used as standardizable candles, with contrasting conclusions found by different teams. In this paper I present evidence that GRB-SNe have the potential to be used as standardizable candles, and show that a statistically significant relation exists between the brightness and width of their decomposed light curves relative to a template supernova. Every single nearby spectroscopically identified GRB-SN, for which the rest-frame and host contributions have been accurately determined, follows this relation. Additionally, it is shown that not only GRB-SNe, but perhaps all supernovae whose explosion is powered by a central engine, may eventually be used as a standardizable candle. Finally, I suggest that the use of GRB-SNe as standardizable candles likely arises from from a combination of the viewing angle and similar explosion geometry in each event, the latter which is influenced by the explosion mechanism of GRB-SNe.