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Title: Common Occurrence of Explosive Hydrogen Burning in Type II Supernovae

In this paper, we report Mo isotopic data for 16 15N-rich presolar SiC grains of type AB ( 14N/ 15N < solar, AB1) and their correlated Sr and Ba isotope ratios when available. Of the 16 AB1 grains, 8 show s-process Mo isotopic compositions, together with s-process Ba and/or Sr isotopic compositions. We found that a higher percentage of AB1 grains show anomalous isotopic compositions than that of AB2 grains ( 14N/ 15N > solar), thus providing further support to the division of the two AB subgroups recently proposed by Liu et al., who showed that AB1 grains most likely originated from Type II supernovae (SNe) with explosive H burning. Comparison of the Sr, Mo, and Ba isotopic compositions of the AB1 grains with SN model predictions indicates that the s-process isotopic compositions of AB1 grains resulted from neutron-capture processes occurring during the progenitor massive stars' pre-SN evolution rather than from an explosive neutron-capture process. Finally, in addition, the observations of (1) explosive H burning occurring in the C-rich regions of the progenitor SNe of X grains as suggested by the isotopic compositions of X grains, and (2) explosive H burning occurring both at the bottom of the He/C zonemore » and at the top of the He/N zone as suggested by model simulations, imply that explosive H burning is a common phenomenon in outer SN zones.« less
Authors:
ORCiD logo [1] ; ORCiD logo [2] ;  [2] ; ORCiD logo [1] ;  [3] ; ORCiD logo [1] ; ORCiD logo [4] ; ORCiD logo [5] ;  [6]
  1. Carnegie Inst. for Science, Washington, DC (United States). Dept. of Terrestrial Magnetism
  2. Univ. of Chicago, IL (United States). Dept. of the Geophysical Sciences; Chicago Center for Cosmochemistry, Chicago, IL (United States)
  3. Clemson Univ., SC (United States). Dept. of Physics and Astronomy
  4. Univ. of Chicago, IL (United States). Dept. of the Geophysical Sciences. The Enrico Fermi Inst.; Chicago Center for Cosmochemistry, Chicago, IL (United States)
  5. Univ. of Chicago, IL (United States). Dept. of the Geophysical Sciences; Chicago Center for Cosmochemistry, Chicago, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division
  6. Univ. of Chicago, IL (United States). Dept. of the Geophysical Sciences. The Enrico Fermi Inst.; Chicago Center for Cosmochemistry, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Publication Date:
Report Number(s):
LLNL-JRNL-735278
Journal ID: ISSN 1538-4357
Grant/Contract Number:
AC52-07NA27344; NNX10AI63G; NNX17AE28G; NNX15AF78G; 80NSSC17K0250; NNX14AI25G
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 855; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Carnegie Inst. for Science, Washington, DC (United States); Univ. of Chicago, IL (United States); Clemson Univ., SC (United States)
Sponsoring Org:
USDOE; LLNL Laboratory Directed Research and Development (LDRD) Program; National Aeronautic and Space Administration (NASA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; circumstellar matter; meteorites; meteors; meteoroids; nuclear reactions; nucleosynthesis; abundances; supernovae
OSTI Identifier:
1432967