Explosive nucleosynthesis from gamma-ray burst and hypernova progenitors: Direct collapse versus fallback

Christopher L. Fryer, Patrick Young, Aimee L. Hungerford

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

The collapsar engine behind long-duration gamma-ray bursts extracts the energy released from the rapid accretion of a collapsing star onto a stellar mass black hole. In a collapsing star, this black hole can form in two ways: the direct collapse of the stellar core into a black hole and the delayed collapse of a black hole caused by fallback in a weak supernova explosion. In the case of a delayed-collapse black hole, the strong collapsar-driven explosion overtakes the weak supernova explosion before shock breakout, and it is very difficult to distinguish this black hole formation scenario from the direct-collapse scenario. However, the delayed-collapse mechanism, with its double explosion, produces explosive nucleosynthetic yields that are very different from those in the direct-collapse scenario. We present one-dimensional studies of the nucleosynthetic yields from both black hole formation scenarios, deriving differences and trends in their nucleosynthetic yields.

Original languageEnglish (US)
Pages (from-to)1028-1047
Number of pages20
JournalAstrophysical Journal
Volume650
Issue number2 I
DOIs
StatePublished - Oct 20 2006

Keywords

  • Gamma rays: bursts
  • Nuclear reactions, nucleosynthesis, abundances
  • Supernovae: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Explosive nucleosynthesis from gamma-ray burst and hypernova progenitors: Direct collapse versus fallback'. Together they form a unique fingerprint.

  • Cite this