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Supercomputing

Modeling Supernovae With a Supercomputer 64

A team of scientists at the University of Chicago will be using 22 million processor-hours to simulate the physics of exploding stars. The team will make use of the Blue Gene/P supercomputer at Argonne National Laboratory to analyze four different scenarios for type Ia supernovae. Included in the link is a video simulation of a thermonuclear flame busting its way out of a white dwarf. The processing time was made possible by the Department of Energy's INCITE program. "Burning in a white dwarf can occur as a deflagration or as a detonation. 'Imagine a pool of gasoline and throw a match on it. That kind of burning across the pool of gasoline is a deflagration,' Jordan said. 'A detonation is simply if you were to light a stick of dynamite and allow it to explode.' In the Flash Center scenario, deflagration starts off-center of the star's core. The burning creates a hot bubble of less dense ash that pops out the side due to buoyancy, like a piece of Styrofoam submerged in water."

Comment Re:Interesting... (Score 2, Informative) 138

You can show from basic stellar structure theory that you need a minimum mass of .08 solar masses or so to ignite hydrogen on the p-p cycle. (You can burn heavier isotopes like lithium and deterium at lower masses, but these contribute negligibly to the energy budget of the star because of their low abundances.) .08 solar masses is about 80 Jupiter masses, so this star is over the p-p burning limit. As another author pointed out, the star has a radius comparable to Jupiter. It turns out that due to the physics of degeneracy pressure. Jupiter is about at a maximum in radius for substellar objects.

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