Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-07-11
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
10 pages, 5 figures, to appear in the proceedings of IAU Symposium 280: "The Molecular Universe"
Scientific paper
The chemical composition of a protoplanetary disk is determined not only by in situ chemical processes during the disk phase, but also by the history of the gas and dust before it accreted from the natal envelope. In order to understand the disk's chemical composition at the time of planet formation, especially in the midplane, one has to go back in time and retrace the chemistry to the molecular cloud that collapsed to form the disk and the central star. Here we present a new astrochemical model that aims to do just that. The model follows the core collapse and disk formation in two dimensions, which turns out to be a critical upgrade over older collapse models. We predict chemical stratification in the disk due to different physical conditions encountered along different streamlines. We argue that the disk-envelope accretion shock does not play a significant role for the material in the disk at the end of the collapse phase. Finally, our model suggests that complex organic species are formed on the grain surfaces at temperatures of 20 to 40 K, rather than in the gas phase in the T>100 K hot corino.
Doty Steven D.
van Dishoeck Ewine F.
Visser Ruud
No associations
LandOfFree
Chemical history of molecules in circumstellar disks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Chemical history of molecules in circumstellar disks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemical history of molecules in circumstellar disks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-138168