skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: CARBON-RICH PRESOLAR GRAINS FROM MASSIVE STARS: SUBSOLAR {sup 12}C/{sup 13}C AND {sup 14}N/{sup 15}N RATIOS AND THE MYSTERY OF {sup 15}N

Journal Article · · Astrophysical Journal Letters
 [1];  [2];  [3]; ;  [4];  [5];  [6];  [7];  [8];  [9]
  1. Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Konkoly Thege Miklos ut 15-17, H-1121 Budapest (Hungary)
  2. Laboratory for Space Sciences and Physics Department, Washington University, St. Louis, MO 63130 (United States)
  3. Max Planck Institute for Chemistry, D-55128 Mainz (Germany)
  4. E.A. Milne Centre for Astrophysics, Dept of Physics and Mathematics, University of Hull, HU6 7RX (United Kingdom)
  5. Department of the Geophysical Sciences and Chicago Center for Cosmochemistry, Chicago, IL 60637 (United States)
  6. Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P5C2 (Canada)
  7. Computational Physics and Methods (CCS-2), LANL, Los Alamos, NM, 87545 (United States)
  8. Keele University, Keele, Staffordshire ST5 5BG (United Kingdom)
  9. The Joint Institute for Nuclear Astrophysics, Notre Dame, IN 46556 (United States)

Carbon-rich grains with isotopic anomalies compared 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. We present a new set of models for the explosive He shell and compare them with the grains showing {sup 12}C/{sup 13}C and {sup 14}N/{sup 15}N ratios lower than solar. In the stellar progenitor H was ingested into the He shell and not fully destroyed before the explosion. Different 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 {sup 13}C and {sup 15}N. The short-lived radionuclides {sup 22}Na and {sup 26}Al are increased by orders of magnitude. The production of radiogenic {sup 22}Ne from the decay of {sup 22}Na 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 {sup 14}N/{sup 15}N 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 {sup 14}N and {sup 15}N in the Galaxy, helping to produce the {sup 14}N/{sup 15}N ratio in the solar system.

OSTI ID:
22518919
Journal Information:
Astrophysical Journal Letters, Vol. 808, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
Country of Publication:
United States
Language:
English

References (30)

Measuring 26Al and 60Fe in the Galaxy journal October 2006
Interstellar diamonds in meteorites journal March 1987
Interstellar graphite in meteorites journal May 1990
Nova nucleosynthesis and Galactic evolution of the CNO isotopes journal June 2003
Three-dimensional simulations of core-collapse supernovae: from shock revival to shock breakout journal April 2015
First stars VI – Abundances of C, N, O, Li, and mixing in extremely metal-poor giants. Galactic evolution of the light elements journal January 2005
Galactic evolution of nitrogen journal June 2004
The early star generations: the dominant effect of rotation on the CNO yields journal February 2006
A strong case for fast stellar rotation at very low metallicities journal March 2006
Probing isotopic ratios at z = 0.89: molecular line absorption in front of the quasar PKS 1830-211 journal September 2006
Grain destruction in shocks in the interstellar medium journal September 1994
The Evolution and Explosion of Massive Stars. II. Explosive Hydrodynamics and Nucleosynthesis journal November 1995
Low‐Density Graphite Grains and Mixing in Type II Supernovae journal January 1999
Molybdenum and Zirconium Isotopes from a Supernova Neutron Burst journal September 2000
Presolar SiC Grains of Type A and B: Their Isotopic Compositions and Stellar Origins journal September 2001
Are Presolar Silicon Carbide Grains from Novae Actually from Supernovae? journal August 2005
Supernova Mixtures Reproducing Isotopic Ratios of Presolar Grains journal September 2007
The evolution of carbon, sulphur and titanium isotopes from high redshift to the local Universe journal October 2008
The evolution of isotope ratios in the Milky Way Galaxy: The evolution of isotope ratios journal May 2011
A 15N-Poor Isotopic Composition for the Solar System As Shown by Genesis Solar Wind Samples journal June 2011
Condensation of Carbon in Radioactive Supernova Gas journal February 1999
Condensation of Carbon in Radioactive Supernova Gas journal November 2001
The Evolution Of Carbon, Sulphur, and Titanium Isotopes from High-Redshift to the Local Universe text January 2008
Is Extra Mixing Really Needed in Asymptotic Giant Branch Stars? text January 2010
Deep Mixing in Evolved Stars: I. The Effect of Reaction Rate Revisions from C to Al text January 2010
The 12C + 12C reaction and the impact on nucleosynthesis in massive stars text January 2012
C, N, and O Isotopic Heterogeneities in Low-density Supernova Graphite Grains from Orgueil text January 2014
Deriving the Metallicity Distribution Function of Galactic Systems text January 2003
First stars VI - Abundances of C, N, O, Li, and mixing in extremely metal-poor giants. Galactic evolution of the light elements text January 2004
The early star generations: the dominant effect of rotation on the CNO yields text January 2005

Cited By (23)

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 journal June 2019
Extreme 13C,15N and 17O isotopic enrichment in the young planetary nebula K4-47 journal December 2018
The evolution of CNO isotopes: a new window on cosmic star formation history and the stellar IMF in the age of ALMA journal May 2017
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 journal June 2018
Low-metallicity CO + He WD post-merger models for RCB stars as a source of pre-solar graphite grains journal September 2018
The evolution of CNO isotopes: the impact of massive stellar rotators journal October 2019
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
A Chemical Signature from Fast-rotating Low-metallicity Massive Stars: ROA 276 in ω Centauri journal March 2017
Transition Elements in Supernova Presolar Grains: Condensation versus Implantation journal January 2018
Common Occurrence of Explosive Hydrogen Burning in Type II Supernovae journal March 2018
Structural Investigation of Silicon Carbide X Grains: Constraints on Condensation in Supernova Ejecta journal November 2018
New Insights into the Galactic Chemical Evolution of Magnesium and Silicon Isotopes from Studies of Silicate Stardust journal December 2018
Condensation of SiC Stardust in CO Nova Outbursts journal February 2019
Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins journal August 2019
Isotopic Signatures of Supernova Nucleosynthesis in Presolar Silicon Carbide Grains of Type AB with Supersolar 14 N/ 15 N Ratios journal December 2019
Presolar Isotopic Signatures in Meteorites and Comets: New Insights from the Rosetta Mission to Comet 67P/Churyumov–Gerasimenko text January 2018
The evolution of CNO isotopes: a new window on cosmic star-formation history and the stellar IMF in the age of ALMA text January 2017
NuGrid Stellar Data Set. II. Stellar Yields from H to Bi for Stellar Models with Mzams = 1 to 25Msun and Z = 0.0001 to 0.02 text January 2017
Transition Elements in Supernova Presolar Grains: Condensation vs. Implantation text January 2017
Condensation of SiC Stardust in CO Nova Outbursts text January 2018
Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar Origins text January 2019
The evolution of CNO isotopes: the impact of massive stellar rotators text January 2019