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The Diversity of Gamma-Ray Bursts and the Surroundings of Massive Stars
Roger A. Chevalier, Zhi-Yun Li, Claes Fransson
The finding of a Type Ic supernova connected with GRB 030329 showed a massive star origin for this burst, supporting evidence for this association in previous bursts with lightcurv…
Pulsar Wind Nebulae and Their Supernovae
Roger A. Chevalier
Young supernova remnants that contain pulsar wind nebulae provide diagnostics for both the inner part of the supernova and the interaction with the surrounding medium, providing an…
Supernova Remnant and Pulsar Wind Nebula Interactions
Roger A. Chevalier
I review several topics in the structure of supernova remnants. Hydrodynamic instabilities in young remnants may give rise to the cellular structure that is sometimes observed, alt…
The Surroundings of Gamma-Ray Bursts: Constraints on Progenitors
Roger A. Chevalier
The association of a supernova with a gamma-ray burst (GRB 030329) implies a massive star progenitor, which is expected to have an environment formed by pre-burst stellar winds. Al…
Cassiopeia A and its Clumpy Presupernova Wind
Roger A. Chevalier, Jeffrey Oishi
The observed shock wave positions and expansion in Cas A can be interpreted in a model of supernova interaction with a freely expanding stellar wind with a mass loss rate of ~3e-5…
Wind-Interaction Models for the Early Afterglows of Gamma-Ray Bursts: The Case of GRB 021004
Zhi-Yun Li, Roger A. Chevalier
Wind-interaction models for gamma-ray burst afterglows predict that the optical emission from the reverse shock drops below that from the forward shock within 100s of seconds of th…