Study of the Dependence of the Plateau Shape for Type II Supernovae on Metallicity

TL;DR

This study investigates how metallicity affects the light curve shape of Type II-P supernovae, proposing a new photometric redshift method based on U band flux decline, supported by model simulations across different metallicities.

Contribution

It introduces a novel approach to determine supernova redshift using U band light curves influenced by metallicity effects, supported by detailed modeling.

Findings

U band flux reaches a plateau at very low metallicities.

Metallicity significantly impacts the flux decline rate in the U band.

The method enables redshift estimation from supernova light curves.

Abstract

We consider the effect of a change in the rate of flux decline in the U band for type II-P supernovae (SNe IIP) as a function of metallicity $Z$. Based on this effect, we propose a new method to determine the photometric redshift from the SN IIP light curve in the U band. Using the STELLA code, we have constructed model light curves in different bands for different redshifts $z = 0.0, 0.1$, and $0.3$ as the metallicity in the models decreases from $Z \sim 10^{-3}$ to $\sim 10^{-6}$. The flux in the U band is shown to reach a plateau at the lowest metallicities. We consider the influence of other parameters as well: the presupernova mass and the mass of radioactive nickel-56.