Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005asthe..98..757k&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 98, No. 11, p. 757 - 763 (2005)
Astronomy and Astrophysics
Astronomy
Comets, Oort Cloud
Scientific paper
Comets are considered to be most pristine icy objects in the solar system. They hold the information of the physical conditions in the solar nebula. Composition of cometary ices, deuterium-to-hydrogen ratios and nuclear spin isomers ratios of cometary molecules have been investigated from the viewpoint of the origin of our solar system. The nuclear spin isomers are focused on here. A nuclear spin temperature derived from the nuclear spin isomers ratio by assuming thermal equilibrium, could be used to infer the physical temperature where the nuclear spins last equilibrated in the solar nebula. Recent studies on the nuclear spin temperatures of cometary molecules are reviewed and the formation of the Oort cloud and the link between the Kuiper belt to the Jupiter family comets are discussed.
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