Journal Article

Dust formation and evolution in a Ca–Fe–SiO–H<sub>2</sub>–O<sub>2</sub> vapour phase condensation experiment and astronomical implications

Frans J. M. Rietmeijer, Aurora Pun and Joseph A. Nuth

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 1, pages 402-408
Published in print June 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI:
Dust formation and evolution in a Ca–Fe–SiO–H2–O2 vapour phase condensation experiment and astronomical implications

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Here, we report on a kinetically controlled vapour phase condensation experiment using a low-calcium Ca–Fe–SiO–H2–O2 vapour. Under these conditions of extreme disequilibrium, the condensate properties become predictable. They are amorphous solids with (predictable) deep metastable eutectic compositions. This study also shows how chemical evolution of the condensate grains will lead to chemically complex amorphous solids. The highly disordered structure of the deep metastable eutectic condensates is the very key to this predictable chemical evolution to grains with a silicate mineral composition, yet being amorphous. We compare our results with astronomical observations of dust around young stellar objects.

Keywords: astrochemistry; methods: laboratory; Solar system: general; planetary systems: protoplanetary discs

Journal Article.  4776 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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