Characterising the secondary maximum in the r-band for Type Ia Supernovae: Diagnostic for the ejecta mass

Seméli Papadogiannakis; Suhail Dhawan; Roberta Morosin; Ariel Goobar

doi:10.1093/mnras/stz493

paper

Characterising the secondary maximum in the r-band for Type Ia Supernovae: Diagnostic for the ejecta mass

arXiv:1812.01438 · doi:10.1093/mnras/stz493

Abstract

An increase in the number of studied Type Ia supernovae (SNe~Ia) has demonstrated that this class of explosions has a greater diversity in its observables than was previously assumed. The reasons (e.g. the explosion mechanism, progenitor system) for such a diversity remain unknown. Here, we analyse a sample of $r$ -band light curves of SNe~Ia, focusing on their behaviour $\sim$ 2-4 weeks after maximum light, i.e. the second maximum. We characterise the second maximum by its timing ( $t_{r_{2}}$ ) and the integrated flux ( $F_{r_{2}}$ ). We find that $t_{r_{2}}$ correlates with the "colour-stretch" parameter s $_{B V}$ , which can be used as a proxy for $^{56}$ Ni mass, and $F_{r_{2}}$ , correlates with the transparency timescale, t $_{0}$ . Using $F_{r_{2}}$ , for a sample of 199 SNe from the Palomar Transient Factory and intermediate Palomar Transient Factory, we evaluate a distribution on t $_{0}$ for a sample of SNe~Ia found in an "untargeted" survey. Comparing this distribution to the predictions of t $_{0}$ ranges from models we find that the largest overlap in t $_{0}$ values between models and observations is for the sub-Chandrasekhar double detonation models. We also compare our relations between t $_{0}$ and $F_{r_{2}}$ , with that from 1-D explosion models of \citet{GK18} and confirm that $F_{r_{2}}$ , can be used as a diagnostic of the total ejecta mass.

arXiv comment8 pages, 9 figures and 12 pages of tables, Accepted MNRAS

Characterising the secondary maximum in the r-band for Type Ia Supernovae: Diagnostic for the ejecta mass

Abstract

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