SN 1998bw/GRB 980425: Hypernova or Aspherical Explosion?

Details SN 1998bw/GRB 980425: Hypernova or Aspherical Explosion? SN 1998bw/GRB 980425: Hypernova or Aspherical Explosion?

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4206w&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #42.06; Bulletin of the American Astronomical Society, Vol. 30, p.1311

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The recent discovery of the unusual supernova SN1998bw and its apparent correlation with the gamma-ray burst GRB 980425 has raised new issues concerning both the GRB and SNe. SN1998bw was unusually bright at maximum light and expansion velocities were large making SN1998bw a possible candidate for a ``hypernova" with explosion energies exceeding 10(52) erg. We show that the light curve of SN1998bw can be understood as the result of an aspherical explosion along the rotational axis of a basically spherical, non-degenerate C/O core of a massive star with an explosion energy of 2 x 10(51) erg, a total ejecta mass of 2 M_o, and a (56) Ni mass of 0.2M_sun if it is seen from high inclinations with respect to the plane of symmetry. In this model, the high expansion velocities are a direct consequence of the aspherical explosion which, in turn, produces oblate iso-density contours. This suggests that the fundamental core-collapse explosion process itself is strongly asymmetric.

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