Type X silicon carbide presolar grains: Type Ia supernova condensates?

Donald D. Clayton, W David Arnett, Jave Kane, Bradley S. Meyer

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

In terms of nucleosynthesis issues alone, we demonstrate that the type X silicon carbide particles have chemical and isotopic compositions resembling those from explosive helium burning in 14N-rich matter. These particles are extracted chemically from meteorites and were once interstellar particles. They have already been identified by their discoverers as supernova particles on the basis of their isotopic compositions, but we argue that they are from supernovae of Type Ia that explode with a cap of helium atop their CO structure. The relative abundances of the isotopes of C and Si and trace N, Mg, and Ca match those in the X particles without need of complicated and arbitrary mixing postulates. Furthermore, both C and Si abundances are enhanced and more abundant than O, which suggests that SiC is in fact the natural condensate of such matter. We also briefly address special issues relevant to the growth of dust within Type la interiors during their expansions.

Original languageEnglish (US)
Pages (from-to)824-834
Number of pages11
JournalAstrophysical Journal
Volume486
Issue number2 PART I
DOIs
StatePublished - 1997

Fingerprint

condensate
silicon carbides
silicon
condensates
supernovae
helium
isotopic composition
meteorites
axioms
nuclear fusion
caps
meteorite
explosive
relative abundance
chemical composition
isotopes
dust
particle
isotope
expansion

Keywords

  • Dust, extinction
  • ISM: abundances
  • ISM: molecules
  • Nuclear reactions, nucleosynthesis, abundances
  • Supernovae: general

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Type X silicon carbide presolar grains : Type Ia supernova condensates? / Clayton, Donald D.; Arnett, W David; Kane, Jave; Meyer, Bradley S.

In: Astrophysical Journal, Vol. 486, No. 2 PART I, 1997, p. 824-834.

Research output: Contribution to journalArticle

Clayton, Donald D. ; Arnett, W David ; Kane, Jave ; Meyer, Bradley S. / Type X silicon carbide presolar grains : Type Ia supernova condensates?. In: Astrophysical Journal. 1997 ; Vol. 486, No. 2 PART I. pp. 824-834.
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