The "Dark Side" of Gamma-Ray Bursts and Implications for Nucleosynthesis of Light and Heavy Elements

Details The "Dark Side" of Gamma-Ray Bursts and Implications for Nucleosynthesis of Light and Heavy Elements The "Dark Side" of Gamma-Ray Bursts and Implications for Nucleosynthesis of Light and Heavy Elements

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf..336i&link_type=abstract

ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent observational and theoretical advances in studies of gamma-ray bursts (GRBs) indicate that there can be a significant "dark side" to the GRB energy budget: besides the ultrarelativistic jet giving rise to the bright gamma-ray emission, there can be an even greater amount of "dark" energy contained in an accompanying, mildly relativistic outflow. The occurrence of such outflows are strongly supported in theoretical models, particularly for collapsar-type GRB progenitors, and also has been directly confirmed in observations of GRB030329/SN2003dh. This outflow component, which should be more baryon-rich than the GRB jet, can have interesting implications for nucleosynthesis. Inside the outflow, light elements may be produced through reactions similar to big bang nucleosynthesis. Heavy element synthesis by neutron capture can also take place, sometimes by a moderately rapid "n-process" rather than an r-process. The resulting nucleosynthetic products may be observationally relevant for the most metal-poor stars, as well as the companion stars of black hole binary systems.

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