Interstellar SiC grains
2016
Silicon carbide (SiC) is one of the major components of cosmic
dust. Small silicon carbide dust particles show a prominent lattice
vibrational band at ~11.3 m m. In the
1960s, Friedemann et al. (1969) first predicted that SiC condenses
in carbon-rich stellar ejecta. Later, SiC was detected in the circumstellar
envelopes around evolved C stars through the 11.3 m m spectral feature. The existence of SiC
in the interstellar medium (ISM) was established through the detection
of presolar SiC grains in primitive meteorites based on the isotopic
anomaly. However, the 11.3 m m absorption
feature of SiC is surprisingly not seen in the ISM. This work mainly
introduces the optical properties of silicon carbide, the observed
characteristics of silicon carbon in a series of astrophysical environment,
and abundance of silicon carbide in interstellar space and the underlying
physics.
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