Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...556..417c&link_type=abstract
The Astrophysical Journal, Volume 556, Issue 1, pp. 417-420.
Astronomy and Astrophysics
Astronomy
14
Comets: General, Comets: Individual (Halley), Molecular Processes
Scientific paper
Among unsolved questions raised by observations of comets is the origin of extended sources, i.e., the distribution of molecules in the coma which cannot be explained by a direct sublimation from the nucleus. Polyoxymethylene [formaldehyde polymer: (-CH2-O-)n, also called POM] is sometimes invoked as a potential parent compound, the degradation of which could produce the required amount of H2CO across the coma, but no quantitative study has ever been undertaken with relevant parameters. From new experimental data, we are now able to consider multiphase chemistry: POM in the solid state on cometary grains slowly degrades by solar photons and heat and produces H2CO in the gaseous phase. This is a new approach to cometary organic chemistry. We show, by considering simple assumptions about the cometary environment, that the hypothesis of POM on grains leads to a very good agreement with Giotto observations if we assume that the cometary grains are ~7% POM by mass at a temperature of 330 K.
Benilan Yves
Cottin Hervé
Gazeau Marie-Claire
Raulin François
No associations
LandOfFree
Polyoxymethylene as Parent Molecule for the Formaldehyde Extended Source in Comet Halley 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 Polyoxymethylene as Parent Molecule for the Formaldehyde Extended Source in Comet Halley, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyoxymethylene as Parent Molecule for the Formaldehyde Extended Source in Comet Halley will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1774205