Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..515a&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
Comets are pristine objects which keeps the information on solar-system formation. In order to reveal connection between interstellar matter and planetary matter such as comets however it is important to consider gravitational collapse accretion onto the protoplanetary disk migration (accretion and mixing) within the disk and coagulation of dust grains to form cometary nuclei. In this presentation we restrict our attention to the stage of protoplanetary disk. Detailed chemical reaction network is solved in a relatively simple accretion disk model to give the spatial distribution of molecular abundances and D/H ratios as a function of time. The result is dependent on ionization rate temperature and/or desorption rate of molecules in the disk. If the temperature is high enough (> 20K) or non-thermal desorption is efficient enough to sublimate dominant species such as CO in comet forming regions the desorbed species will be transformed to less volatile species and incorporated into ice mantle again. Chemistry in these outer radii has some similarity to that in dense cores; it produces both oxidized and reduced species with high D/H ratios.
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