Astronomy and Astrophysics – Astronomy
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...625l..55h&link_type=abstract
The Astrophysical Journal, Volume 625, Issue 1, pp. L55-L57.
Astronomy and Astrophysics
Astronomy
Ism: Dust, Extinction, Ism: Molecules, Molecular Processes
Scientific paper
The dust formation process was simulated by a molecular dynamics method for the system consisting of Si, Mg, Al, O, H, and He in roughly cosmic abundance. As the temperature was lowered from 6000 K, the coagulation due to random collisions made the clusters grow, and solidification proceeded to make amorphous Mg-Al-silicate clusters of various sizes having an average coordination number of 2.2 for Si at 1000 K. Water formation was observed at around 3500 K on the surface Mg atoms that have been squeezed out from the inside due to thermal vibrations. These water molecules in the gas phase at 500 K might turn out to be the ice mantle at very cold temperatures that covers the thus formed dust.
Hirano Tsuneo
Kozawa Yuko
Ohishi Masatoshi
Uehara Miki
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