X-ray bursts from Type II supernovae

Details X-ray bursts from Type II supernovae X-ray bursts from Type II supernovae

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223l.109k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 223, Aug. 1, 1978, p. L109-L112.

Astronomy and Astrophysics

Astrophysics

105

Astronomical Models, Computerized Simulation, Supernovae, X Ray Sources, Energy Spectra, Hydrodynamics, Shock Waves, Thermodynamic Equilibrium

Scientific paper

X-ray burst emission during the shock breakout phase of a Type II supernova is investigated for a 12-solar-mass red giant at the end of its nuclear evolution. A supernova model based on a one-dimensional spherically symmetric hydrodynamic code with fine zoning is employed, the detailed time-dependent evolution of the supernova is calculated, and the time-dependent development of the emitted spectrum is computed. By using the calculated structure of the model at any given time, a formal solution of the non-LTE equation of radiative transfer is performed frequency by frequency for the mean intensity. Spectra of the emergent radiation near luminosity maximum and at a somewhat later time are plotted and compared with blackbody spectra for temperatures corresponding to a Rosseland optical depth of 0.67. It is found that a precursor burst of soft X radiation (0.2 to 0.5 keV) with a duration of 1000 sec, a peak luminosity corresponding to a blackbody at 230,000 K, and a distinctly non-Planckian spectrum emerges from the photosphere within 75,000 sec of the explosion. The potential observability of such a burst with an X-ray satellite is estimated.

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