What Does The Jet Of Cas A Tell Us About Its Progenitor Star? Hydrodynamics Inc.

Details What Does The Jet Of Cas A Tell Us About Its Progenitor Star? Hydrodynamics Inc. What Does The Jet Of Cas A Tell Us About Its Progenitor Star? Hydrodynamics Inc.

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.1503s&link_type=abstract

American Astronomical Society Meeting 210, #15.03; Bulletin of the American Astronomical Society, Vol. 39, p.113

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The shape of a supernova remnant (SNR) is largely determined by its circumstellar medium, which is formed by the supernova’s progenitor star. In the Cassiopeia A SNR, a jet is apparent in the North-East and, less prominently, in the South-West. The progenitor of Cas A is thought to have had a red supergiant phase followed by a Wolf-Rayet (WR) phase. With 2D-hydrodynamical simulations of an axisymmetric explosion and the progenitor wind, using the ZEUS-3D code, we try to reproduce the morphology of Cas A and put restrictions on its progenitor history and the energy budget of the jet.
In our simulations, the main variables are the duration of the WR phase and the jet energies. The other variables, such as density and explosion energy, are constrained by demanding that the main shock radius and velocity match those observed for Cas A. We find that the presence of a jet severely constrains the duration of the WR phase. For a long duration the contrast in density between the WR wind and the surrounding shell, and the mass and thickness of the shell, become so large that the jet is destroyed as soon as it hits the shell. Our main conclusion is therefore that the WR phase must have been short (< 5000 yrs), if present at all. Since the actual jet length is unknown, we can only derive a lower limit for the jet energy, which is 1050 erg. We report on an analytical formula for the jet length as a function of jet energy that fits the results from simulations quite well.

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