Numeric spectral radiation hydrodynamic calculations of supernova shock breakouts
- Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100 (Israel)
We present here an efficient numerical scheme for solving the non-relativistic one-dimensional radiation-hydrodynamics equations including inelastic Compton scattering, which is not included in most codes and is crucial for solving problems such as shock breakout. The devised code is applied to the problems of a steady-state planar radiation mediated shock (RMS) and RMS breakout from a stellar envelope. The results are in agreement with those of a previous work on shock breakout, in which Compton equilibrium between matter and radiation was assumed and the 'effective photon' approximation was used to describe the radiation spectrum. In particular, we show that the luminosity and its temporal dependence, the peak temperature at breakout, and the universal shape of the spectral fluence derived in this earlier work are all accurate. Although there is a discrepancy between the spectral calculations and the effective photon approximation due to the inaccuracy of the effective photon approximation estimate of the effective photon production rate, which grows with lower densities and higher velocities, the difference in peak temperature reaches only 30% for the most discrepant cases of fast shocks in blue supergiants. The presented model is exemplified by calculations for supernova 1987A, showing the detailed evolution of the burst spectrum. The incompatibility of the stellar envelope shock breakout model results with observed properties of X-ray flashes (XRFs) and the discrepancy between the predicted and observed rates of XRFs remain unexplained.
- OSTI ID:
- 22370128
- Journal Information:
- Astrophysical Journal, Vol. 796, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COSMOLOGY AND ASTRONOMY
APPROXIMATIONS
COMPTON EFFECT
DENSITY
EQUATIONS
EQUILIBRIUM
HYDRODYNAMICS
INELASTIC SCATTERING
LUMINOSITY
PHOTONS
RADIANT HEAT TRANSFER
RELATIVISTIC RANGE
SHOCK WAVES
SPECTRA
STAR EVOLUTION
STEADY-STATE CONDITIONS
SUPERNOVAE
VELOCITY
X RADIATION
X-RAY FLUORESCENCE ANALYSIS