Presolar silicon carbide grains from a CO3 meteoriteOPEN ACCESS 

· by · in , ,

Emilie T. Dunham, Michael R. Savina, Ming-Chang Liu, Gregory A. Brennecka, Peter K. Weber, Julie M. Korsmeyer, Andrew M. Davis, Philipp R. Heck, Thomas Stephan, Maximilian Ehrenfels & Autumn G. Roberts

The European Physical Journal A, Volume 62, article number 203, Published: 04 October 2026

LINK (OPEN ACCESS)
PDF (OPEN ACCESS)

“Presolar silicon carbide (SiC) grains found in primitive meteorites can help constrain circumstellar condensation processes and nucleosynthesis in C-rich low-mass asymptotic giant branch stars and core collapse supernovae. We performed the first presolar grain chemical separation procedure on primitive CO3 meteorite Northwest Africa 7892 and identified 45 presolar SiC grains. These grains fit into the previously defined presolar SiC groups in similar proportions. We used a new secondary ion mass spectrometer (NanoSIMS XR prototype) to obtain high spatial resolution images of the grains. Three of the grains have isotopically distinct hotspots: regions 150–500 nm in diameter whose 12C/13C ratios differ from that of the host grain by > 5σ. Though the origin of the hotspots is unclear, these nanoscale features demonstrate the potential for new discoveries with the ultrabright Cs+ make it superscript source in the NanoSIMS XR prototype.”

Related posts (automatically generated):

  1. Isotope studies of presolar silicon carbide grains from supernovae: new constraints for hydrogen-ingestion supernova modelsOPEN ACCESS 
  2. Isotopic Analyses of Presolar Silicon Carbide Grains from Aguas Zarcas
  3. New Constraints for Supernova Models from Presolar Silicon Carbide X Grains with Very High 26Al/27Al RatiosOPEN ACCESS 
  4. Presolar Silicon Carbide Grains of Types Y and Z: Their Molybdenum Isotopic Compositions and Stellar OriginsOPEN ACCESS 
  5. Correlated Molybdenum, Ruthenium, and Barium Isotope Anomalies in Presolar Silicon Carbide GrainsOPEN ACCESS 
  6. NanoSIMS Isotope Studies of Rare Types of Presolar Silicon Carbide Grains from the Murchison Meteorite: Implications for Supernova Models and the Role of 14C
  7. Evaporation kinetics of silicon carbide in a low-pressure H2-H2O gas mixture: Implications for the survivability of presolar silicon carbide grains in the protosolar diskOPEN ACCESS 
  8. Sulfur in presolar silicon carbide grains from asymptotic giant branch stars
  9. Simultaneous iron and nickel isotopic analyses of presolar silicon carbide grains
  10. Presolar silicon carbide grains of types Y and Z: their strontium and barium isotopic compositions and stellar origins
Tags: , , , , ,