SN 1998bw/GRB 980425: Hypernova or Aspherical Explosion?
| dc.creator | Hoeflich, P. | |
| dc.creator | Wheeler, J. C. | |
| dc.creator | Wang, L. | |
| dc.date | 1998-07-31 | |
| dc.date.accessioned | 2026-07-07T02:27:31Z | |
| dc.date.available | 2026-07-07T02:27:31Z | |
| dc.description | 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 2E51 erg, a total ejecta mass of 2 M_o, and a 56Ni mass of 0.2M_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 the aspherical explosion which, in turn, produces oblate iso-density contours. This suggests that the fundamental core-collapse explosion process itself is strongly asymmetric. | |
| dc.description | 5 pages, 2 figures, submitted to ApJ Letters | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9807345 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9807345 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/12728 | |
| dc.subject | Astrophysics | |
| dc.title | SN 1998bw/GRB 980425: Hypernova or Aspherical Explosion? | |
| dc.type | text |