Constraints on Explosion Timescale of Core-Collapse Supernovae Based on Systematic Analysis of Light Curves

Abstract

Explosion mechanism of core-collapse supernovae is not fully understood yet. In this work, we give constraints on the explosion timescale based on ${}^{56}$Ni synthesized by supernova explosions. First, we systematically analyze multi-band light curves of 82 stripped-envelope supernovae (SESNe) to obtain bolometric light curves, which is among the largest samples of the bolometric light curves of SESNe derived from the multi-band spectral energy distribution. We measure the decline timescale and the peak luminosity of the light curves and estimate the ejecta mass ($M_{\mathrm{ej}}$) and ${}^{56}$Ni mass ($M_{\mathrm{Ni}}$) to connect the observed properties with the explosion physics. We then carry out one-dimensional hydrodynamics and nucleosynthesis calculations, varying the progenitor mass and the explosion timescale. From the calculations, we show that the maximum ${}^{56}$Ni mass that ${}^{56}$Ni-powered SNe can reach is expressed as $M_{\mathrm{Ni}}\lesssim 0.2M_{\mathrm{ej}}$. Comparing the results from the observations and the calculations, we show that the explosion timescale shorter than 0.3 sec explains the synthesized ${}^{56}$Ni mass of the majority of the SESNe.

21 pages, 15 figures, accepted for publication in ApJ

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Cited by in corpus (3)

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• Magnetar Engines in Fast Blue Optical Transients and Their Connections with SLSNe, SNe Ic-BL, and lGRBs
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