Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21442705k&link_type=abstract
American Astronomical Society, AAS Meeting #214, #427.05; Bulletin of the American Astronomical Society, Vol. 41, p.697
Astronomy and Astrophysics
Astronomy
Scientific paper
These experiments are scaled to the blast wave driven instabilities at the He/H interface during the explosion phase of SN1987A. This core-collapse supernova was detected about 50 kpc from Earth making it the first supernova observed so closely to earth in modern times. The progenitor star was a blue supergiant with a mass of 18-20 solar masses. A blast wave occurred following the supernova explosion because there was a sudden, finite release of energy. Blast waves consist of a shock front followed by a rarefaction wave. When a blast wave crosses an interface with a decrease in density, hydrodynamic instabilities will develop. These experiments include target materials scaled in density to the He/H layer in SN1987A. About 5 kJ of laser energy from the Omega Laser facility irradiates a 150 µm plastic layer that is followed by a low-density foam layer. A blast wave structure similar to those in supernovae is created in the plastic layer. The blast wave crosses a three-dimensional interface with a wavelength of 71 µm in two orthogonal directions. This produces unstable growth dominated by the Rayleigh-Taylor (RT) instability. We have detected the interface structure under these conditions, using dual orthogonal radiography, and will show some of the resulting data. Recent advancements in our x-ray backlighting techniques have greatly improved the resolution of our x-ray radiographic images. Under certain conditions, the improved images show some mass extending beyond the RT spike and penetrating further than previously observed. Current simulations do not show this phenomenon. It is possible that magnetic pressure generated by orthogonal components of the electron density gradient and the electron temperature gradient cause the spikes to reach the shock front. The amount of mass in the spike extensions is discussed. This research was sponsored by the SSAA through DOE Research Grants DE-FG52-07NA28058, DE-FG52-04NA00064
Arnett David
Budde A.
Drake Robert
Fryxell Bruce
Grosskopf Michael
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