Speaker
Description
We present shell events of 4$\pi$-3D non-rotating 12.28 M$_{\odot}$ and 12.98 M$_{\odot}$ supernova progenitors simulated for a period of one-hour before core-collapse. The main interest is to study the interior shell properties (from the kinematic, thermodynamic to the chemical evolution) and their interactions for a period of one-hour before collapse. The high-resolution of these models as well as the 3D geometry are important for capturing the development and evolution of low and high order convective modes. The pre-collapse shell-merger event occurs in the 12.28 M$_{\odot}$ model, while in the 12.98 M$_{\odot}$ model shells remain intact until the progenitor phase elapse. The shells of interest are Ne and Si because our studies show that violent shell-merger is triggered roughly at the Ne/Si interface. Our analysis show that at this interface, the entropy flattens out across the Ne and Si shells just before merger. As a consequence, the 12.28 M$_{\odot}$ progenitor for which shell-merger occurs has higher radial velocity fluctuations and higher turbulent Mach number, and thus higher turbulent kinetic energy compared to the 12.98 M$_{\odot}$ non-shell merger progenitor. Meaning core-collapse supernova progenitors with shell-merger are more violent than the progenitors without shell-merger.
