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For refcode 1992A&A...253L...9K:
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1992A&A...253L...9K Letter to the Editor Type Ia supernovae: theoretical light curves with a slow pre-maximum rise A. Khokhlov, E. Muller, and P. Hoflich Max-Planck-Institut fur Astrophysik, Karl-Schwarzschild-Strasse 1, W-8046 Garching bei Munchen, Federal Republic of Germany Astronomical Council of the Academy of Sciences of the USSR, Moscow, USSR Received August 20, accepted October 10,1991 Abstract. We present theoretical light curve (LC) calculations which reproduce Type Ia supernovae with a slow pre-maximum rise (V maximum at ~ 20 days), like the recently observed SN 1990 N. We use the same input physics as in our previous work (Hoflich et al. 1991). In addition, both Thomson and line scattering has been included, which is crucial for reproducing the monochromatic LC. For the radiation transport the moment equations are solved. Our calculations are based on delayed detonation models in which the transition from a deflagration to a detonation occurs due to the pulsation of an exploding white dwarf. The interaction with an extended low density envelope created during the pulsation leads to a substantial redistribution of the kinetic energy inside the ejecta. The deceleration of the bulk of matter to <~ 10000 km/sec delays the rise time of the light curve from ~ 10 - 12 days, typical of delayed detonation models without a pulsation, to ~ 17 days, whereas the outer envelope acquires velocities of up to 30000 km/sec. The interaction with the extended ~10^10^ cm envelope is not specific to the delayed detonation scenario. To illustrate the effect we present the results of computations of the explosion of 1.2 M_sun_CO-WD inside an extended envelope of 0.8 M_sun_, which results in a rise time of ~ 25 days. Key words: Supernovae and supernovae remnants: SN 1990 N
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