On the Theory of the Light Curves of Supernovate

Details On the Theory of the Light Curves of Supernovate On the Theory of the Light Curves of Supernovate

Jan 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971ap%26ss..10...28g&link_type=abstract

Astrophysics and Space Science, Volume 10, Issue 1, pp.28-51

Astronomy and Astrophysics

Astrophysics

99

Scientific paper

An account of the theory of the light curves of supernovae is presented, based on certain assumptions concerning the passage through the stellar atmosphere of powerful shock waves. The investigation is based on numerical integration of appropriate equations of gas dynamics and radiative heat-conductivity. The calculations substantially involve the ionization and recombination of hydrogen in the envelope of a supernova. Changes are traced in the curves arising from the transition from compact stars with small radius (˜10R &sun;), to stars with very extensive envelopes (˜10000R &sun;). The light curves for compact stars agree well with observations of the peculiar supernovae in NGC 5457, NGC 6946 and NGC 5236. The characteristics of the light curves with the passage of shock waves through the extended atmosphere coincide within an order of magnitude with observations of the supernovae of type II and type I near their maximum brightness. A powerful heat-wave propagates before the shock-front in the extensive atmosphere which gives rise to a detached supernova envelope in the form of a thin spherical layer. We investigated the condition in an ascending wave of cooling and recombination in the supernova envelope. It is shown that part of the hydrogen may recombine to attain full transparency for radiation passing through it. The observations are compared with the results of the theory of radioactive decay of the elements. This explanation of the light curves by the passage of shock waves requires energies of 1050 to 1052 ergs, which are in agreement with mechanisms of thermonuclear explosions.

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