Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...626l.129k&link_type=abstract
The Astrophysical Journal, Volume 626, Issue 2, pp. L129-L132.
Astronomy and Astrophysics
Astronomy
18
Ism: Dust, Extinction, Ism: Clouds, Methods: Laboratory, Minor Planets, Asteroids
Scientific paper
We have identified new formation routes of diamond in interstellar clouds and parent bodies of carbonaceous chondrites in laboratory experiments. The diamond precursor nucleated under UV photolysis of interstellar ice mixtures in molecular clouds and grew with further UV irradiation in diffuse clouds. The present study supports the occurrence of diamonds in interstellar clouds and suggests that diamond is ubiquitous in space. We also performed experiments on the processes of aqueous alteration and subsequent thermal metamorphism of organic materials formed in molecular clouds, and the results were consistent with the formation of diamonds by this process in the parent bodies of carbonaceous chondrites. The various characteristics of nanodiamonds in chondrites and interplanetary dust are well explained by these new formation routes.
Kaito Chihiro
Kimura Yusuke
Kouchi Akira
Nakano Hiroyuki
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