Radio Supernovae and GRB 980425

Details Radio Supernovae and GRB 980425 Radio Supernovae and GRB 980425

2000-02-27

arxiv.org/abs/astro-ph/0002501v1

Astronomy and Astrophysics

Astrophysics

20 pages, 11 figures, to appear in "The Largest Explosions Since the Big Bang: Supernovae and Gamma Ray Bursts," proceedings o

Scientific paper

Study of radio supernovae (RSNe) over the past 20 years includes two dozen detected objects and more than 100 upper limits. From this work we are able to identify classes of radio properties, demonstrate conformance to and deviations from existing models, estimate the density and structure of the circumstellar material and, by inference, the evolution of the presupernova stellar wind, and reveal the last stages of stellar evolution before explosion. It is also possible to detect ionized hydrogen along the line of sight, to demonstrate binary properties of the stellar system, and to show clumpiness of the circumstellar material. More speculatively, it may be possible to provide distance estimates to radio supernovae. The interesting and unusual radio supernova SN 1998bw, which is thought to be related to the gamma-ray burst GRB 980425, is discussed in particular detail. Its radio properties are compared and contrasted with those of other known RSNe.

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