Hypernova models for SN 1998bw and SN 1997ef.

Details Hypernova models for SN 1998bw and SN 1997ef. Hypernova models for SN 1998bw and SN 1997ef.

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hea..work..165n&link_type=abstract

Japanese-German Workshop on High Energy Astrophysics, p. 165 - 170

Astronomy and Astrophysics

Astrophysics

Supernovae: Models, Supernovae: Classification, Supernovae: Gamma-Ray Bursts, Supernovae: Light Curves, Supernovae: Nucleosynthesis, Supernovae: Progenitors, Supernovae: Stellar Evolution

Scientific paper

The supernova 1998bw sets an important precedent because of its possible link to the gamma-ray burst GRB 980425, suggested by their coincidence in position and time of occurrence. The observed spectral features indicate that SN 1998bw is likely to be a Type Ic supernova, originating from a carbon+oxygen (C+O) star progenitor. However, the observed peak luminosity, L ≡ 1.6×1043erg sec-1, is almost ten times brighter than that of previously known Type Ib/Ic supernovae. This implies the production of ≡0.7 Msun 56Ni and an extremely large explosion energy. The authors present a "hypernova" model for SN 1998bw and discuss its possible connection to GRB 980425. The model is an exploding C+O star with a mass of MCO ≡ 12-15 Msun, which is characterized by an explosion energy of Eexp ≡ 2-5×1052ergs. The optical light curve and the spectral and velocity evolution calculated for this model are in good agreement with observations of SN 1998bw. Models with smaller mass and energy are not consistent with the observations. The extremely large explosion energy could be explained by a rapidly rotating black hole with a strong magnetic field. The massive progenitor star (initially ≡40 Msun) must have had an unusually large angular momentum or a strong magnetic field owing possibly to binary interaction. The authors also find that the light curve and spectra of another Type Ic supernova SN 1997ef can also be reproduced by a hypernova model with the C+O star of MCO ≡ 11 Msun and Eexp ≡ 1×1052erg.

Affiliated with

Also associated with

No associations

Rating

Hypernova models for SN 1998bw and SN 1997ef. 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 Hypernova models for SN 1998bw and SN 1997ef., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hypernova models for SN 1998bw and SN 1997ef. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1499562