Constraints On Model Parameters From The Light Curve Of SN 1993J
Session 66 -- Supernova Remnants
Oral presentation, Thursday, 2, 1994, 10:00-11:30

## [66.03] Constraints On Model Parameters From The Light Curve Of SN 1993J

T.R. Young, E. Baron, D. Branch (University of Oklahoma)

A parameter study of theoretical light curves are compared to the observations of SN 1993J in order to assign constraints to model parameters. The light curve of SN 1993J was best fit with a radius of $\sim$ $3\times10^{13}$~cm, an ejected mass of $\sim$ 2 M$_\odot$, an explosion energy of $\sim$ $1\times10^{51}$~ergs, $^{56}$Ni mass of $\sim$ 0.1 M$_\odot$, hydrogen envelope mass of $\sim$ 0.5 M$_\odot$, and $^{56}$Ni mixing throughout the He core. Constraints on the model parameters were obtained by unacceptable deviations of the theoretical light curves in comparison to the observed light curve. The 1-D, spherically symetric, flux limited hydrodynamical calculations include gamma-rays and opacity tables. We use the HST cepheid distance of 3.63 Mpc. The radius and He mass are important in identifying the progenitor star. The hydrogen mass is important for the spectral evolution. The energy and $^{56}$Ni mass are diagnostics of the expolosion mechanism and mass cut. The $^{56}$Ni mixing gives information on the gas dynamics.