Magnetorotationally driven supernovae as the origin of early galaxy r-process elements?
| Autor: | C. Winteler, Roger Kaeppeli, Nicolas Vasset, Nobuya Nishimura, Albino Perego, M. Liebendoerfer, Friedrich-Karl Thielemann, Almudena Arcones |
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| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences Astrophysics Electron Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences magnetohydrodynamics (MHD) neutron [stars] Nucleosynthesis 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Absorption (logic) Ejecta 010303 astronomy & astrophysics magnetic field stars: neutron stars: rotation [magnetohydrodynamics (MHD) nuclear reactions nucleosynthesis abundances stars] Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) nuclear reactions Physics 010308 nuclear & particles physics abundances nucleosynthesis Astronomy and Astrophysics Galaxy Supernova Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science magnetic field [stars] rotation [stars] r-process Neutrino |
| Zdroj: | ASTROPHYSICAL JOURNAL LETTERS |
| Popis: | We examine magnetorotationally driven supernovae as sources of $r$-process elements in the early Galaxy. On the basis of thermodynamic histories of tracer particles from a three-dimensional magnetohydrodynamical core-collapse supernova model with approximated neutrino transport, we perform nucleosynthesis calculations with and without considering the effects of neutrino absorption reactions on the electron fraction ($Y_{e}$) during post-processing. We find that the peak distribution of $Y_{e}$ in the ejecta is shifted from $\sim0.15$ to $\sim0.17$ and broadened toward higher $Y_{e}$ due to neutrino absorption. Nevertheless, in both cases the second and third peaks of the solar $r$-process element distribution can be well reproduced. The rare progenitor configuration that was used here, characterized by a high rotation rate and a large magnetic field necessary for the formation of bipolar jets, could naturally provide a site for the strong $r$-process in agreement with observations of the early galactic chemical evolution. Comment: 5 pages, 4 figures |
| Databáze: | OpenAIRE |
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