期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 836, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aa5dee
关键词
gamma-ray burst: general; magnetohydrodynamics (MHD); neutrinos; nuclear reactions, nucleosynthesis, abundances; stars: neutron; supernovae: general
资金
- ERC [306901, 321263]
- JSPS [16H03986, 24103006, 24244036, 26800149, 26870823]
- MEXT [15H01039, 15H00789]
- MEXT as Priority Issue on Post-K computer (Elucidation of the Fundamental Laws and Evolution of the Universe)
- JICFuS
- Grants-in-Aid for Scientific Research [15H01039, 26800149, 16H03986, 24103006, 26870823, 15H00789] Funding Source: KAKEN
- European Research Council (ERC) [306901, 321263] Funding Source: European Research Council (ERC)
We investigated r-process nucleosynthesis in magneto-rotational supernovae, based on a new explosion mechanism induced by the magneto-rotational instability (MRI). A series of axisymmetric magneto-hydrodynamical simulations with detailed microphysics including neutrino heating is performed, numerically resolving the MRI. Neutrino-heating dominated explosions, enhanced by magnetic fields, showed mildly neutronrich ejecta producing nuclei up to A similar to 130 (i. e., the weak r-process), while explosion models with stronger magnetic fields reproduce a solar-like r-process pattern. More commonly seen abundance patterns in our models are in between the weak and regular r-process, producing lighter and intermediate-mass nuclei. These intermediate r-processes exhibit a variety of abundance distributions, compatible with several abundance patterns in r-process-enhanced metal-poor stars. The amount of Eu ejecta similar to 10(-5) M circle dot in magnetically driven jets agrees with predicted values in the chemical evolution of early galaxies. In contrast, neutrino-heating dominated explosions have a significant amount of Fe (Ni-56) and Zn, comparable to regular supernovae and hypernovae, respectively. These results indicate magneto-rotational supernovae can produce a wide range of heavy nuclei from iron-group to r-process elements, depending on the explosion dynamics.
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