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Title: Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins

Abstract

We report Mo isotopic compositions of 37 presolar SiC grains of types Y (19) and Z (18), rare types commonly argued to have formed in lower-than-solar metallicity asymptotic giant branch (AGB) stars. Here direct comparison of the Y and Z grain data with data for mainstream grains from AGB stars of close-to-solar metallicity demonstrates that the three types of grains have indistinguishable Mo isotopic compositions. We show that the Mo isotope data can be used to constrain the maximum stellar temperatures ( T MAX) during thermal pulses in AGB stars. Comparison of FRUITY Torino AGB nucleosynthesis model calculations with the grain data for Mo isotopes points to an origin from low-mass (~1.5–3 M ) rather than intermediate-mass (>3–~9 M ) AGB stars. Because of the low efficiency of 22Ne(α, n) 25Mg at the low T MAX values attained in low-mass AGB stars, model calculations cannot explain the large 30Si excesses of Z grains as arising from neutron capture, so these excesses remain a puzzle at the moment.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4];  [2]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [2]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [8]
  1. Washington Univ. in St. Louis, St. Louis, MO (United States); Carnegie Inst. for Science, Washington, D.C. (United States)
  2. The Univ. of Chicago, Chicago, IL (United States); Chicago Center for Cosmochemistry, Chicago, IL (United States)
  3. INAF-Osservatorio Astronomico d’Abruzzo, Teramo (Italy); INFN-Sezione di Perugia, Perugia (Italy)
  4. Univ. di Torino, Torino (Italy)
  5. Carnegie Inst. for Science, Washington, D.C. (United States)
  6. The Univ. of Chicago, Chicago, IL (United States); Chicago Center for Cosmochemistry, Chicago, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. The Univ. of Chicago, Chicago, IL (United States); Chicago Center for Cosmochemistry, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  8. TRIUMF, Vancouver, BC (Canada); Univ. of Victoria, BC (Canada)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1571732
Report Number(s):
LLNL-JRNL-765107
Journal ID: ISSN 1538-4357; 955089
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 881; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; circumstellar matter; meteorites; meteors; meteoroids; nuclear reactions; nucleosynthesis; abundances–stars: AGB and post-AGB–stars: carbon

Citation Formats

Liu, Nan, Stephan, Thomas, Cristallo, Sergio, Gallino, Roberto, Boehnke, Patrick, Nittler, Larry R., Alexander, Conel M. O’D., Davis, Andrew M., Trappitsch, Reto, Pellin, Michael J., and Dillmann, Iris. Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab2d27.
Liu, Nan, Stephan, Thomas, Cristallo, Sergio, Gallino, Roberto, Boehnke, Patrick, Nittler, Larry R., Alexander, Conel M. O’D., Davis, Andrew M., Trappitsch, Reto, Pellin, Michael J., & Dillmann, Iris. Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins. United States. doi:10.3847/1538-4357/ab2d27.
Liu, Nan, Stephan, Thomas, Cristallo, Sergio, Gallino, Roberto, Boehnke, Patrick, Nittler, Larry R., Alexander, Conel M. O’D., Davis, Andrew M., Trappitsch, Reto, Pellin, Michael J., and Dillmann, Iris. Fri . "Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins". United States. doi:10.3847/1538-4357/ab2d27.
@article{osti_1571732,
title = {Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins},
author = {Liu, Nan and Stephan, Thomas and Cristallo, Sergio and Gallino, Roberto and Boehnke, Patrick and Nittler, Larry R. and Alexander, Conel M. O’D. and Davis, Andrew M. and Trappitsch, Reto and Pellin, Michael J. and Dillmann, Iris},
abstractNote = {We report Mo isotopic compositions of 37 presolar SiC grains of types Y (19) and Z (18), rare types commonly argued to have formed in lower-than-solar metallicity asymptotic giant branch (AGB) stars. Here direct comparison of the Y and Z grain data with data for mainstream grains from AGB stars of close-to-solar metallicity demonstrates that the three types of grains have indistinguishable Mo isotopic compositions. We show that the Mo isotope data can be used to constrain the maximum stellar temperatures (T MAX) during thermal pulses in AGB stars. Comparison of FRUITY Torino AGB nucleosynthesis model calculations with the grain data for Mo isotopes points to an origin from low-mass (~1.5–3 M ⊙) rather than intermediate-mass (>3–~9 M ⊙) AGB stars. Because of the low efficiency of 22Ne(α, n)25Mg at the low T MAX values attained in low-mass AGB stars, model calculations cannot explain the large 30Si excesses of Z grains as arising from neutron capture, so these excesses remain a puzzle at the moment.},
doi = {10.3847/1538-4357/ab2d27},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 881,
place = {United States},
year = {2019},
month = {8}
}

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