Nucleosynthesis in Jets from Collapsars

Shin Ichiro Fujimoto, Nobuya Nishimura, Masa Aki Hashimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We investigate nucleosynthesis inside magnetically driven jets ejected from collapsars, or rotating magnetized stars collapsing to a black hole, based on two-dimensional magnetohydrodynamic simulation of the collapsars during the core collapse. We follow the evolution of the abundances of about 4000 nuclides from the collapse phase to the ejection phase using a large nuclear reaction network. We find that the r-process successfully operates only in the energetic jets (>1051 erg), so that U and Th are synthesized abundantly, even when the collapsars have a relatively small magnetic field (1010 G) and a moderately rotating core before the collapse. The abundance patterns inside the jets are similar to that of the r-elements in the solar system. The higher energy jets have larger amounts of 56Ni. Less energetic jets, which have small amounts of 56Ni, could induce GRB without supernova, such as GRB060505 and GRB060614.

Original languageEnglish
Title of host publicationOrigin of Matter and Evolution of Galaxies - 10th International Symposium on Origin of Matter and Evolution of Galaxies
Subtitle of host publicationFrom the Dawn of Universe to the Formation of Solar System, OMEG 2007
EditorsToshitaka Kajino, Takuma Suda, Takaya Nozawa, Akira Ohnishi, Masayuki Y. Fujimoto, Shigeru Kubono, Kiyoshi Kato
PublisherAmerican Institute of Physics Inc.
Pages99-104
Number of pages6
ISBN (Electronic)9780735405370
DOIs
Publication statusPublished - 2008
Event10th International Symposium on Origin of Matter and Evolution of Galaxies: From the Dawn of Universe to the Formation of Solar System, OMEG 2007 - Sapporo, Japan
Duration: Dec 4 2007Dec 7 2007

Publication series

NameAIP Conference Proceedings
Volume1016
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other10th International Symposium on Origin of Matter and Evolution of Galaxies: From the Dawn of Universe to the Formation of Solar System, OMEG 2007
Country/TerritoryJapan
CitySapporo
Period12/4/0712/7/07

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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