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1999ApJ...521..179H - Astrophys. J., 521, 179-189 (1999/August-2)
Aspherical explosion models for SN 1998bw/GRB 980425.
HOEFLICH P., WHEELER J.C. and WANG L.
Abstract (from CDS):
We investigate the hypothesis that SNe Ic and SN 1998bw are the results of aspherical explosions along the rotational axis of basically spherical, nondegenerate C/O cores of massive stars. Light curves for aspherical explosions are computed assuming an ellipsoidal geometry for the ejecta. Guided by the polarization observations of ``normal'' SN Ic and related events, we assume an axis ratio of 2 near maximum light. The evolution of the isodensity contours with time is discussed. We show that the light curve of SN 1998bw may be understood with an explosion energy of 2x1051 ergs, a total ejecta mass of 2 M☉, and a mass of 56Ni of 0.2 M☉ if it is observed at a large angle (≥60°) with respect to the plane of symmetry. In this picture, the high expansion velocities are a direct consequence of an aspherical explosion mechanism which, in turn, produces oblate isodensity contours. Prolate isodensity contours are ruled out. This interpretation suggests that the fundamental core-collapse explosion process itself is strongly asymmetric.
Abstract Copyright: ∼
Journal keyword(s): Gamma Rays: Bursts - Polarization - Radiative Transfer - supernovae: individual (SN 1998bw)
CDS comments: p.179 : DN 193-529 = Str 1931-529
Simbad objects: 8
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