Solving the gamma-ray radiative transfer equation for supernovae

Abstract

We present a new relativistic radiative-transfer code for $\gamma$-rays of energy less than 5 MeV in supernova (SN) ejecta. This code computes the opacities, the prompt emissivity (i.e. decay), and the scattering emissivity, and solves for the intensity in the co-moving frame. Because of the large expansion velocities of SN ejecta, we ignore redistribution effects associated with thermal motions. The energy deposition is calculated from the energy removed from the radiation field by scattering or photoelectric absorption. This new code yields comparable results to an independent Monte Carlo code. However, both yield non-trivial differences with the results from a pure absorption treatment of $\gamma$-ray transport. A synthetic observer's frame spectrum is also produced from the CMF intensity. At early times when the optical depth to $\gamma$-rays is large, the synthetic spectrum show asymmetric line profiles with redshifted absorption as seen in SN 2014J. This new code is integrated within CMFGEN and allows for an accurate and fast computation of the decay energy deposition in SN ejecta.

9 pages, 7 figures. Accepted for publication in MNRAS

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Cited by in corpus (6)

• Supernovae Ib and Ic from the explosion of helium stars
• Properties of gamma-ray decay lines in 3D core-collapse supernova models, with application to SN 1987A and Cas A
• Spectral signatures of H-rich material stripped from a non-degenerate companion by a Type Ia supernova
• Supernovae double-peaked light curves from double-nickel distribution
• Comparing Moment-Based and Monte Carlo Methods of Radiation Transport Modeling for Type II-Plateau Supernova Light Curves
• The thermalization of $\gamma$-rays in radioactive expanding ejecta: A simple model and its application for Kilonovae and Ia SNe