Evolution of the Circumstellar Medium around a Gamma-Ray Burst Progenitor

Details Evolution of the Circumstellar Medium around a Gamma-Ray Burst Progenitor Evolution of the Circumstellar Medium around a Gamma-Ray Burst Progenitor

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sgrb.confe..40v&link_type=abstract

Presented at the KITP Conference: Supernova and Gamma-Ray Burst Remnants, Feb 10, 2006, Kavli Institute for Theoretical Physics,

Physics

Scientific paper

We present the results of hydrodynamical simulations of the circumstellarmedium around a Gamma-ray burst progenitor. We use the mass loss history ofa rapidly rotating, low metallicity massive star as input for oursimulations. The interior of this star is homogeneous due to rotationalmixing. In general, the mass loss rate of this star is low, while the windvelocity is high, except when the star reaches critical rotation. Duringthese periods, the star produces adense, highly anisotropic wind, which radically changes the morphology ofthe circumstellar medium. From our simulations we can predict the densityprofile of the circumstellar medium along the polar axis of the star, whichis the medium into which the gamma-ray burst jet would expand. We can alsopredict the likelihood of blue shifted absorption lines in the afterglowspectrum.

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