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Bullets in a Core Collapse Supernova Remnant: The Vela Remnant
Chih-Yueh Wang, Roger A. Chevalier
We use two-dimensional hydrodynamical simulations to investigate the properties of dense ejecta clumps (bullets) in a core collapse supernova remnant, motivated by the observation…
Supernova Interaction with a Circumstellar Medium
Roger A. Chevalier, Claes Fransson
The explosion of a core collapse supernova drives a powerful shock front into the wind from the progenitor star. A layer of shocked circumstellar gas and ejecta develops that is su…
Interaction Models for GRB Afterglows
Zhi-Yun Li, Roger A. Chevalier
We review interaction models for GRB afterglows, with an eye on constraining the nature of their progenitors and the geometry of explosion. Evidence is presented for two types of p…
Optical and Ultraviolet Spectroscopy of SN 1995N: Evidence for Strong Circumstellar Interaction
Claes Fransson, Roger A. Chevalier, Alexei V. Filippenko +9
Optical and ultraviolet observations of the Type IIn supernova 1995N at epochs between 321 and 1799 days after the explosion show three distinct velocity components. The narrow lin…
The Nature of the Compact Supernova Remnants in Starburst Galaxies
Roger A. Chevalier, Claes Fransson
Radio observations of starburst regions in galaxies have revealed groups of compact nonthermal sources that may be radiative supernova remnants expanding in the interclump medium o…
Pulsar Wind Nebulae in Evolved Supernova Remnants
John M. Blondin, Roger A. Chevalier, Dargan M. Frierson
For pulsars similar to the one in the Crab Nebula, most of the energy input to the surrounding wind nebula occurs on a timescale of less than 1000 years; during this time, the nebu…