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Title: The 13C-Pocket Structure In AGB Models: Constraints From Zirconium Isotope Abundances In Single Mainstream SiC Grains

Journal Article · · The Astrophysical Journal
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5];  [6]
  1. Univ. of Chicago, IL (United States). Dept. of the Geophysical Sciences; Chicago Center for Cosmochemistry, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Univ. of Turin (Italy). Dept. of Physics
  3. Univ. of Turin (Italy). Dept. of Physics; The INAF Astrophysical Observatory of Turin (Italy)
  4. Univ. of Chicago, IL (United States). Dept. of the Geophysical Sciences. Enrico Fermi Inst.; Chicago Center for Cosmochemistry, Chicago, IL (United States)
  5. Chicago Center for Cosmochemistry, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  6. Univ. of Chicago, IL (United States). Dept. of the Geophysical Sciences. Enrico Fermi Inst.; Chicago Center for Cosmochemistry, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
+ Show Author Affiliations

In this paper, we present postprocess asymptotic giant branch (AGB) nucleosynthesis models with different 13C-pocket internal structures to better explain zirconium isotope measurements in mainstream presolar SiC grains by Nicolussi et al. and Barzyk et al. We show that higher-than-solar 92Zr/94Zr ratios can be predicted by adopting a 13C-pocket with a flat 13C profile, instead of the previous decreasing-with-depth 13C profile. Finally, the improved agreement between grain data for zirconium isotopes and AGB models provides additional support for a recent proposal of a flat 13C profile based on barium isotopes in mainstream SiC grains by Liu et al.

Research Organization:
Univ. of Chicago, IL (United States); Univ. of Turin (Italy); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA) (United States); Joint Inst. for Nuclear Astrophysics (JINA) (United States); Karlsruhe Inst. of Technology (KIT) (Germany)
Contributing Organization:
Chicago Center for Cosmochemistry, Chicago, IL (United States); The INAF Astrophysical Observatory of Turin (Italy)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1357464
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 788; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (13)

H ingestion into He-burning convection zones in super-AGB stellar models as a potential site for intermediate neutron-density nucleosynthesis journal December 2015
Partial mixing and the formation of 13C pockets in AGB stars: effects on the s-process elements journal June 2017
NuGrid stellar data set – III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z= 0.01, Z = 0.02, and Z = 0.03 journal August 2019
s -PROCESSING IN AGB STARS REVISITED. II. ENHANCED 13 C PRODUCTION THROUGH MHD-INDUCED MIXING journal February 2016
Application of a Theory and Simulation-Based Convective Boundary Mixing Model for agb star Evolution and Nucleosynthesis journal August 2016
NUGRID STELLAR DATA SET. I. STELLAR YIELDS FROM H TO BI FOR STARS WITH METALLICITIES Z = 0.02 and Z = 0.01 journal August 2016
The Importance of the 13 C( α ,n) 16 O Reaction in Asymptotic Giant Branch Stars journal May 2018
New Constraints on the Major Neutron Source in Low-mass AGB Stars journal September 2018
Molybdenum Isotopes in Presolar Silicon Carbide Grains: Details of s -process Nucleosynthesis in Parent Stars and Implications for r - and p -processes journal May 2019
Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins journal August 2019
NuGrid stellar data set - III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z=0.01, Z=0.02 and Z=0.03 text January 2019
Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins text January 2019
Application of a Theory and Simulation-based Convective Boundary Mixing Model for AGB Star Evolution and Nucleosynthesis text January 2016

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