Aspherical Explosion Models for SN 1998bw/GRB 980425

Details Aspherical Explosion Models for SN 1998bw/GRB 980425 Aspherical Explosion Models for SN 1998bw/GRB 980425

1998-08-10

arxiv.org/abs/astro-ph/9808086v1

Astronomy and Astrophysics

Astrophysics

12 pages, 8 figures, latex, aas2pp4.sty, submitted to ApJ

Scientific paper

10.1086/307521

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 supernovae. Although the spectra resemble those of TypeIc supernovae, there are distinct differences at early times and SN1998bw appeared to be unusually bright and red at maximum light. The apparent expansion velocities inferred by the Doppler shift of (unidentified) absorption features appeared to be high, making SN1998bw a possible candidate for a "hypernova" with explosion energies between 20 and 50E51 erg and ejecta masses in excess of 6 - 15 M_o. Based on light curve calculations for aspherical explosions and guided by the polarization observations of "normal" SNIc and related events, we present an alternative picture that allows SN1998bw to have an explosion energy and ejecta mass consistent with core collapse supernovae (although at the 'bright' end). We show that the LC of SN1998bw can be understood as result of an aspherical explosion along the rotational axis of a basically spherical, non-degenerate C/O core of massive star with an explosion energy of 2foe and a total ejecta mass of 2 M_o 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 an aspherical explosion which, in turn, produces oblate iso-density contours. It suggests that the fundamental core-collapse explosion process itself is strongly asymmetric.

Affiliated with

Also associated with

No associations

Rating

Aspherical Explosion Models for SN 1998bw/GRB 980425 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Aspherical Explosion Models for SN 1998bw/GRB 980425, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aspherical Explosion Models for SN 1998bw/GRB 980425 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-256368