Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..485k&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
We discuss the evolution of interstellar materials in comets by comparison of pristine materials in interplanetary dust particles (IDPs) which are collected in the stratosphere to present-day interstellar dust. Some IDPs are suggested to be primitive and of cometary origin and contain submicrometer-sized glass with embedded metal and sulfides (GEMS) within a matrix of amorphous carbonaceous material that is most probably transformed from primordial interstellar organics. GEMS provides a candidate material for primordial interstellar silicates preserved in comets and the amorphous carbonaceous materials are the most likely carriers of the high D/H ratio. This shows a similarity to submicrometer-sized core-mantle grains in diffuse interstellar clouds that are suggested from some of the astrophysical models. For this study we assume that siliceous and carbonaceous materials in present-day interstellar dust provide a reference composition for primordial interstellar dust. We study possible processing of interstellar materials through the formation and evolution of comets by deriving the elemental abundances and inferring the composition of interstellar dust in the present diffuse cloud around the sun from remote sensing observations and in situ measurements.
Kimura Hiroshi
Mann Ingrid
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