White dwarf convection -- ignition of a Type Ia Supernova in an 1152^3 MAESTRO simulation
Автор: Mike Zingale
Загружено: 2012-04-02
Просмотров: 937
Описание:
A close up of the center of a white dwarf at the point of ignition of a Type Ia supernova. Here we see temperature contours. The blue dot represents the geometric center of the star, and its size is the size of a zone in this simulation (effective resolution 4.4 km).
We see a failed hotspot (moving toward the lower left) -- it gets hot and then cools as it expands and moves outward from the center. Following this is the hotspot that ignites (moving toward the lower right). For this study, we turned off the burning in the hotspot once it passed a critical level to allow us to see the dynamics of any other hotspots. A third hotspot, in the upper right corner, never gets hot enough to runaway -- it goes out on its own.
These dynamics suggest that the ignition process is due to a single hotspot -- none of the other hotspots in the domain were ready to runaway.
This calculation is described in detail in: Nonaka, A., Aspden, A. J., Zingale, M., Almgren, A. S., Bell, J. B., & Woosley, S. E. 2012, ApJ, 745, 73. This was run at the OLCF through an INCITE allocation.
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