Infrared spectra of meteoritic SiC grains

A. C. Andersen, C. Jäger, H. Mutschke, A. Braatz, D. Clément, Th Henning, U. G. Jørgensen, U. Ott

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We present here the first infrared spectra of meteoritic SiC grains. The mid-infrared transmission spectra of meteoritic SiC grains isolated from the Murchison meteorite were measured in the wavelength range 2.5-16.5 μm, in order to make available the optical properties of presolar SiC grains. These grains are most likely stellar condensates with an origin predominately in carbon stars. Measurements were performed on two different extractions of presolar SiC from the Murchison meteorite. The two samples show very different spectral appearance due to different grain size distributions. The spectral feature of the smaller meteoritic SiC grains is a relatively broad absorption band found between the longitudinal and transverse lattice vibration modes around 11.3 μm, supporting the current interpretation about the presence of SiC grains in carbon stars. In contrast to this, the spectral feature of the large (> 5 μm) grains has an extinction minimum around 10 μm. The obtained spectra are compared with commercially available SiC grains and the differences are discussed. This comparison shows that the crystal structure (e.g., β-SiC versus α-SiC) of SiC grains plays a minor role on the optical signature of SiC grains compared to e.g. grain size.

Original languageEnglish
Pages (from-to)933-938
Number of pages6
JournalAstronomy and Astrophysics
Volume343
Issue number3
Publication statusPublished - 1999

Fingerprint

Murchison meteorite
infrared spectra
grain size
carbon
condensate
crystal structure
optical property
vibration
extinction
carbon stars
wavelength
lattice vibrations
condensates
vibration mode
signatures
absorption spectra
optical properties
comparison
wavelengths

Keywords

  • Infrared: ISM: lines and bands
  • ISM: dust, extinction
  • ISM: lines and bands
  • Stars: abundances
  • Stars: atmospheres
  • Stars: carbon

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Andersen, A. C., Jäger, C., Mutschke, H., Braatz, A., Clément, D., Henning, T., ... Ott, U. (1999). Infrared spectra of meteoritic SiC grains. Astronomy and Astrophysics, 343(3), 933-938.

Infrared spectra of meteoritic SiC grains. / Andersen, A. C.; Jäger, C.; Mutschke, H.; Braatz, A.; Clément, D.; Henning, Th; Jørgensen, U. G.; Ott, U.

In: Astronomy and Astrophysics, Vol. 343, No. 3, 1999, p. 933-938.

Research output: Contribution to journalArticle

Andersen, AC, Jäger, C, Mutschke, H, Braatz, A, Clément, D, Henning, T, Jørgensen, UG & Ott, U 1999, 'Infrared spectra of meteoritic SiC grains', Astronomy and Astrophysics, vol. 343, no. 3, pp. 933-938.
Andersen AC, Jäger C, Mutschke H, Braatz A, Clément D, Henning T et al. Infrared spectra of meteoritic SiC grains. Astronomy and Astrophysics. 1999;343(3):933-938.
Andersen, A. C. ; Jäger, C. ; Mutschke, H. ; Braatz, A. ; Clément, D. ; Henning, Th ; Jørgensen, U. G. ; Ott, U. / Infrared spectra of meteoritic SiC grains. In: Astronomy and Astrophysics. 1999 ; Vol. 343, No. 3. pp. 933-938.
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