Other
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..526..608c&link_type=abstract
GAMMA-RAY BURSTS: 5th Huntsville Symposium. AIP Conference Proceedings, Volume 526, pp. 608-616 (2000).
Other
1
Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Jets And Bursts, Galactic Winds And Fountains, Supernovae
Scientific paper
Radio observations of supernovae can be interpreted as the interaction of the outer steep density profile of the supernovae with stellar winds from the progenitor stars. Modeling of the thermal supernova emission shows that the supernovae have massive star progenitors that are expected to have winds. Multiwavelength observations of the supernovae give additional constraints on the wind interaction which allow, in some cases, the determination of the parameters for the synchrotron emission. In the case of GRBs, thermal emission from a supernova was observed in one case and possibly in two others, but the nonthermal emission is generally the only diagnostic for determining the nature of the source. The distribution of the circumstellar matter is important for determining the progenitor object and there is some evidence for at least 2 types of progenitors among the observed afterglows. However, the density determination is complicated by a lack of knowledge of basic parameters for the synchrotron emission model. In addition, the possibilities of jet effects and a transition to subrelativistic expansion further complicate the situation. Multiwavelength observations extended over time are needed to limit the possibilities. .
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