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Capturing the Fire: Flame Energetics and Neutronizaton for Type Ia Supernova Simulations

A. C. Calder·D. M. Townsley·I. R. Seitenzahl·F. Peng·O. E. B. Messer·N. Vladimirova·E. F. Brown·J. W. Truran·D. Q. Lamb
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Abstract

We develop and calibrate a realistic model flame for hydrodynamical simulations of deflagrations in white dwarf (Type Ia) supernovae. Our flame model builds on the advection-diffusion-reaction model of Khokhlov and includes electron screening and Coulomb corrections to the equation of state in a self-consistent way. We calibrate this model flame--its energetics and timescales for energy release and neutronization--with self-heating reaction network calculations that include both these Coulomb effects and up-to-date weak interactions. The burned material evolves post-flame due to both weak interactions and hydrodynamic changes in density and temperature. We develop a scheme to follow the evolution, including neutronization, of the NSE state subsequent to the passage of the flame front. As a result, our model flame is suitable for deflagration simulations over a wide range of initial central densities and can track the temperature and electron fraction of the burned material through the explosion and into the expansion of the ejecta.

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A. C. Calder, D. M. Townsley, I. R. Seitenzahl, F. Peng, O. E. B. Messer, N. Vladimirova, E. F. Brown, J. W. Truran, D. Q. Lamb. 2006-11-01. Capturing the Fire: Flame Energetics and Neutronizaton for Type Ia Supernova Simulations. https://doi.org/10.1086/510709

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