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- W3100553322 abstract "We present a numerical investigation of the contribution of the presupernova ejecta of Wolf-Rayet stars to the environment surrounding gamma-ray bursts (GRBs) and describe how this external matter can affect the observable afterglow characteristics. An implicit hydrodynamic calculation for massive stellar evolution is used here to provide the inner boundary conditions for an explicit hydrodynamical code to model the circumstellar gas dynamics. The resulting properties of the circumstellar medium are then used to calculate the deceleration of a relativistic, gasdynamical jet and the corresponding afterglow light curve produced as the shock wave propagates through the shocked wind medium. We find that variations in the stellar wind drive instabilities that may produce radial filaments in the shocked wind region. These comet-like tails of clumps could give rise to strong temporal variations in the early afterglow light curve. Afterglows may be expected to differ widely among themselves, depending on the angular anisotropy of the jet and the properties of the stellar progenitor; a wide diversity of behaviors may be the rule, rather than the exception." @default.
- W3100553322 created "2020-11-23" @default.
- W3100553322 creator A5000211031 @default.
- W3100553322 creator A5029210401 @default.
- W3100553322 creator A5061940766 @default.
- W3100553322 creator A5069612542 @default.
- W3100553322 date "2005-09-20" @default.
- W3100553322 modified "2023-10-17" @default.
- W3100553322 title "The State of the Circumstellar Medium Surrounding Gamma‐Ray Burst Sources and Its Effect on the Afterglow Appearance" @default.
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- W3100553322 doi "https://doi.org/10.1086/432433" @default.
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