The Type IIP Supernova 2012aw in M95: hydrodynamical modelling of the photospheric phase from accurate spectrophotometric monitoring

Abstract

We present an extensive optical and near-infrared photometric and spectroscopic campaign of the type IIP supernova SN 2012aw. The dataset densely covers the evolution of SN 2012aw shortly after the explosion up to the end of the photospheric phase, with two additional photometric observations collected during the nebular phase, to fit the radioactive tail and estimate the ${}^{56}$Ni mass. Also included in our analysis is the already published \textit{Swift} UV data, therefore providing a complete view of the ultraviolet-optical-infrared evolution of the photospheric phase. On the basis of our dataset, we estimate all the relevant physical parameters of SN 2012aw with our radiation-hydrodynamics code: envelope mass $M_{env}\sim 20M_{\odot }$, progenitor radius $R\sim 3\times 10^{13}$ cm ($\sim 430R_{\odot }$), explosion energy $E\sim 1.5$ foe, and initial ${}^{56}$Ni mass $\sim 0.06$ $M_{\odot }$. These mass and radius values are reasonably well supported by independent evolutionary models of the progenitor, and may suggest a progenitor mass higher than the observational limit of $16.5\pm 1.5M_{\odot }$ of the Type IIP events.

arXiv commentApJ accepted

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