Silicon Burning II: Quasi-Equilibrium and Explosive Burning

Abstract

Having examined the application of quasi-equilibrium to hydrostatic silicon burning in Paper I of this series, Hix & Thielemann (1996), we now turn our attention to explosive silicon burning. Previous authors have shown that for material which is heated to high temperature by a passing shock and then cooled by adiabatic expansion, the results can be divided into three broad categories; \emph{incomplete burning}, \emph{normal freezeout} and \emph{$\alpha$-rich freezeout}, with the outcome depending on the temperature, density and cooling timescale. In all three cases, we find that the important abundances obey quasi-equilibrium for temperatures greater than approximately 3 GK, with relatively little nucleosynthesis occurring following the breakdown of quasi-equilibrium. We will show that quasi-equilibrium provides better abundance estimates than global nuclear statistical equilibrium, even for normal freezeout and particularly for $\alpha$-rich freezeout. We will also examine the accuracy with which the final nuclear abundances can be estimated from quasi-equilibrium.

27 pages, including 15 inline figures. LaTeX 2e with aaspp4 and graphicx packages. Accepted to ApJ

References in corpus (6)

• On the Nature of Core Collapse Supernova Explosions
• Inside the Supernova: A Powerful Convective Engine
• Silicon Burning I: Neutronization and the Physics of Quasi-Equilibrium
• The First Second of a Type-II Supernova: Convection, Accretion, and Shock Propagation
• The Interplay Between Protoneutron Star Convection and Neutrino Transport in Core Collapse Supernovae
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