Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921203m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #212.03; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
We study the long-term evolution of relativistic jets in collapsars and examine the effects of viewing angle on the subsequent gamma ray bursts. We present a series of high-resolution simulations of a jet propagating through a stellar envelope in 2D cylindrical coordinates using the FLASH adaptive mesh relativistic hydrodynamics module. Our simulations allow us to single out three phases in the jet evolution. First, there is a precursor phase in which relativistic material turbulently shed from the head of the jet first emerges from the star over a wide opening angle. Second, in the shocked jet phase fully shocked jet material is emerging with a narrow, constant opening angle. And finally, there is an unshocked jet phase during which the jet consists of a free-streaming, unshocked core surrounded by a thin boundary layer of shocked jet material. The opening angle increases logarithmically with time during the unshocked jet phase. As a consequence, some observers see prolonged dead times of emission between the precursor and unshocked phases, even for constant properties of the jet injected in the stellar core. We discuss the observational implications of our results, emphasizing the possible ways to test progenitor models through the effects of jet propagation in the star.
Begelman Mitchell C.
Lazzati Davide
Morsony Brian J.
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