Origin and Evolution of Dust in Circumstellar and Interstellar Environments

Details Origin and Evolution of Dust in Circumstellar and Interstellar Environments Origin and Evolution of Dust in Circumstellar and Interstellar Environments

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..341..605t&link_type=abstract

Chondrites and the Protoplanetary Disk, ASP Conference Series, Vol. 341, Proceedings of a workshop held 8-11 November 2004 in Ka

Astronomy and Astrophysics

Astronomy

18

Scientific paper

Astronomical observations and analysis of stardust isolated from meteorites have revealed a highly diverse interstellar and circumstellar grain inventory, including both amorphous materials and highly crystalline compounds (oxides, silicates and carbonaceous). This dust is highly processed during its sojourn from its birthsite (stellar outflows and supernova explosions) to its incorporation into protoplanetary systems. Of particular importance is processing by cosmic rays in the interstellar medium and by strong shocks due to supernova explosions. The latter is predicted to lead to rapid destruction due to sputtering by impacting gas ions and shattering due to grain-grain collisions.
In recent years, much progress has been made in understanding the origin and evolution of interstellar dust. This is largely driven by new infrared spectroscopic tools becoming available for astronomical studies and ever more elegant laboratory techniques allowing a deeper and deeper probing of stardust isolated from meteorites. In this paper, we address a number of key questions relevant to studies of chondrites in meteorites: ``What is the inventory of dust entering the Solar Nebula ?'', ``What processes played a role in its formation and evolution in the interstellar medium ?'', and ``What is the evidence for processing of interstellar dust in protoplanetary systems ?''.

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