科研之友
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摘要
We investigate the nu-process in an energetic Type Ic supernova (SN Ic) and the resultant productions of the light elements including boron and its stable isotopes. SN Ic is a very unique boron source because it can produce boron not only through spallation reactions as discussed in Nakamura & Shigeyama but also the nu-process. The nu-process is considered to occur in core-collapse supernovae and previous studies were limited to SNe II. Although the progenitor star of an SN Ic does not posses an He envelope so that (7)Li production via the nu-process is unlikely, (11)B can be produced in the C-rich layers. We demonstrate a hydrodynamic simulation of a SN Ic explosion and estimate the amounts of the light elements produced via the nu-process for the first time, and also the subsequent spallation reactions between the outermost layers of the compact SN Ic progenitor and the ambient medium. We find that the nu-process in the current SN Ic model produces a significant amount of (11)B, which is diluted by (10)B from spallation reactions to get closer to B isotopic ratios observed in meteorites. We also confirm that high-temperature mu and tau neutrinos and their anti-neutrinos, reasonably suggested from the compact structure of SN Ic progenitors, enhance the light-element production through the neutral current reactions, which may imply an important role of SNe Ic in the Galactic chemical evolution.
- 出版日期2010-8-1
- 单位中国科学院国家天文台
