Simulated Radio Images and Light Curves of SN 1993J

Details Simulated Radio Images and Light Curves of SN 1993J Simulated Radio Images and Light Curves of SN 1993J

2004-01-07

arxiv.org/abs/astro-ph/0401065v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, to appear in proceedings of IAU Colloq. 192, Supernovae: 10 Years of 1993J, eds. J.M. Marcaide and K.W. We

Scientific paper

We present calculations of the radio images and light curves from supernovae, based on high-resolution numerical simulations of the hydrodynamics and radiation transfer in a spherically symmetric medium. As a specific example we model the emission from SN1993J. This supernova does not appear to be expanding in a self-similar fashion, and cannot be adequately fitted with the often-used analytic mini-shell model. We present a good fit to the radio evolution at a single frequency. Both free-free absorption and synchrotron self-absorption are needed to fit the light curve at early times, and a circumstellar density profile of $\rho \sim r ^{-1.7}$ provides the best fit to the later data. Comparisons of VLBI images of SN1993J with synthetic model images suggest that internal free-free absorption completely obscures emission at 8.4 GHz passing through the center of the supernova for the first few tens of years after explosion.

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