Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.5701t&link_type=abstract
American Astronomical Society, AAS Meeting #212, #57.01; Bulletin of the American Astronomical Society, Vol. 40, p.251
Astronomy and Astrophysics
Astronomy
Scientific paper
Astronomical observations and analysis of stardust isolated from meteorites have revealed a highly diverse interstellar and circumstellar grain inventory, including a wide range of amorphous materials and crystalline compounds (silicates and carbon). This diversity reflects the wide range of stellar sources injecting solids into the interstellar medium each with its own physical characteristics such as density, temperature and elemental composition. Once injected into the interstellar medium, dust is highly processed during its sojourn from its birthsite (stellar outflows and explosions) to its incorporation into protoplanetary systems. Of particular importance is processing in the interstellar medium by cosmic rays and by strong shocks driven by supernova explosions. The former leads to amorphization. The latter leads to rapid destruction due to sputtering by impacting gas ions and shattering due to grain-grain collisions. Further processing occurs in the planet-forming disk around Young Stellar Objects either through high temperature chemistry in the inner nebula or by temporal events such as shock waves or lightning throughout the nebula. I will review the inventory of interstellar dust and its characteristics and describe relevant processes and their importance.
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