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Title: Carbon-rich presolar grains from massive stars. Subsolar 12 C/ 13 C and 14 N/ 15 N ratios and the mystery of 15 N

Abstract

We compared carbon-rich grains with isotopic anomalies to the Sun are found in primitive meteorites. They were made by stars, and carry the original stellar nucleosynthesis signature. Silicon carbide grains of Type X and C and low-density (LD) graphites condensed in the ejecta of core-collapse supernovae. Furthermore, we present a new set of models for the explosive He shell and compare them with the grains showing 12C/13C and 14N/15N ratios lower than solar. In the stellar progenitor H was ingested into the He shell and not fully destroyed before the explosion. All of the explosion energies and H concentrations are considered. If the supernova shock hits the He-shell region with some H still present, the models can reproduce the C and N isotopic signatures in C-rich grains. Hot-CNO cycle isotopic signatures are obtained, including a large production of 13C and 15N. The short-lived radionuclides 22Na and 26Al are increased by orders of magnitude. The production of radiogenic 22Ne from the decay of 22Na in the He shell might solve the puzzle of the Ne-E(L) component in LD graphite grains. This scenario is attractive for the SiC grains of type AB with 14N/15N ratios lower than solar, and provides an alternativemore » solution for SiC grains originally classified as nova grains. Finally, this process may contribute to the production of 14N and 15N in the Galaxy, helping to produce the 14N/15N ratio in the solar system.« less

Authors:
 [1];  [2];  [3];  [4];  [4];  [5];  [6];  [7];  [8];  [9]
  1. Hungarian Academy of Sciences, Budapest (Hungary). Research Center for Astronomy and Earth Sciences; Univ. of Basel (Switzerland). Dept. of Physics
  2. Washington Univ., St. Louis, MO (United States). Lab. for Space Sciences and Physics Dept.
  3. Max Planck Inst. for Chemistry, Mainz (Germany)
  4. Univ. of Hull (United Kingdom). E.A Milne Center for Astrophysics
  5. Chicago Center for Cosmochemistry, Chicago, IL (United States). Dept. of Geophysical Sciences
  6. Univ. of Victoria, BC (Canada). Dept. of Physics and Astronomy; Joint Inst. for Nuclear Astrophysics (JINA), Notre Dame, IN (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  8. Keele Univ. (United Kingdom); Univ. of Tokyo (Japan). Inst. for the Physics and Mathematics of the Universe (WPI)
  9. Joint Inst. for Nuclear Astrophysics (JINA), Notre Dame, IN (United States); Arizona State Univ., Tempe, AZ (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1329581
Report Number(s):
LA-UR-15-21497
Journal ID: ISSN 2041-8213
Grant/Contract Number:  
AC52-06NA25396; PHY 02-16783; PHY- 09-22648; PHY-1430152; EU MIRG-CT-2006-046520; EU-fP7-ERC-2012-St; NNX11AH14G; NNX09AG39G
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal. Letters (Online); Journal Volume: 808; Journal Issue: 2; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; nuclear reactions; nucleosynthesis; abundances-stars: abundances; stars: evolution; stars: interiors; supernovae: general

Citation Formats

Pignatari, M., Zinner, E., Hoppe, P., Jordan, C. J., Gibson, B. K., Trappitsch, R., Herwig, F., Fryer, C., Hirschi, R., and Timmes, F. X. Carbon-rich presolar grains from massive stars. Subsolar 12 C/ 13 C and 14 N/ 15 N ratios and the mystery of 15 N. United States: N. p., 2015. Web. doi:10.1088/2041-8205/808/2/L43.
Pignatari, M., Zinner, E., Hoppe, P., Jordan, C. J., Gibson, B. K., Trappitsch, R., Herwig, F., Fryer, C., Hirschi, R., & Timmes, F. X. Carbon-rich presolar grains from massive stars. Subsolar 12 C/ 13 C and 14 N/ 15 N ratios and the mystery of 15 N. United States. https://doi.org/10.1088/2041-8205/808/2/L43
Pignatari, M., Zinner, E., Hoppe, P., Jordan, C. J., Gibson, B. K., Trappitsch, R., Herwig, F., Fryer, C., Hirschi, R., and Timmes, F. X. Thu . "Carbon-rich presolar grains from massive stars. Subsolar 12 C/ 13 C and 14 N/ 15 N ratios and the mystery of 15 N". United States. https://doi.org/10.1088/2041-8205/808/2/L43. https://www.osti.gov/servlets/purl/1329581.
@article{osti_1329581,
title = {Carbon-rich presolar grains from massive stars. Subsolar 12 C/ 13 C and 14 N/ 15 N ratios and the mystery of 15 N},
author = {Pignatari, M. and Zinner, E. and Hoppe, P. and Jordan, C. J. and Gibson, B. K. and Trappitsch, R. and Herwig, F. and Fryer, C. and Hirschi, R. and Timmes, F. X.},
abstractNote = {We compared carbon-rich grains with isotopic anomalies to the Sun are found in primitive meteorites. They were made by stars, and carry the original stellar nucleosynthesis signature. Silicon carbide grains of Type X and C and low-density (LD) graphites condensed in the ejecta of core-collapse supernovae. Furthermore, we present a new set of models for the explosive He shell and compare them with the grains showing 12C/13C and 14N/15N ratios lower than solar. In the stellar progenitor H was ingested into the He shell and not fully destroyed before the explosion. All of the explosion energies and H concentrations are considered. If the supernova shock hits the He-shell region with some H still present, the models can reproduce the C and N isotopic signatures in C-rich grains. Hot-CNO cycle isotopic signatures are obtained, including a large production of 13C and 15N. The short-lived radionuclides 22Na and 26Al are increased by orders of magnitude. The production of radiogenic 22Ne from the decay of 22Na in the He shell might solve the puzzle of the Ne-E(L) component in LD graphite grains. This scenario is attractive for the SiC grains of type AB with 14N/15N ratios lower than solar, and provides an alternative solution for SiC grains originally classified as nova grains. Finally, this process may contribute to the production of 14N and 15N in the Galaxy, helping to produce the 14N/15N ratio in the solar system.},
doi = {10.1088/2041-8205/808/2/L43},
journal = {The Astrophysical Journal. Letters (Online)},
number = 2,
volume = 808,
place = {United States},
year = {Thu Jul 30 00:00:00 EDT 2015},
month = {Thu Jul 30 00:00:00 EDT 2015}
}

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Works referencing / citing this record:

Presolar Isotopic Signatures in Meteorites and Comets: New Insights from the Rosetta Mission to Comet 67P/Churyumov–Gerasimenko
journal, September 2018


A new population of dust from stellar explosions among meteoritic stardust
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Extreme 13C,15N and 17O isotopic enrichment in the young planetary nebula K4-47
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The evolution of CNO isotopes: a new window on cosmic star formation history and the stellar IMF in the age of ALMA
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NuGrid stellar data set – II. Stellar yields from H to Bi for stellar models with MZAMS = 1–25 M⊙ and Z = 0.0001–0.02
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Low-metallicity CO + He WD post-merger models for RCB stars as a source of pre-solar graphite grains
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