Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dps....30.3102b&link_type=abstract
American Astronomical Society, DPS meeting #30, #31.02; Bulletin of the American Astronomical Society, Vol. 30, p.1071
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Comet Hale-Bopp has been observed in October and March 1997 at the IRAM Plateau de Bure Interferometer. Millimetre lines of 8 molecules (HCN, HNC, CO, H_2CO, H_2S, SO, CS and CH_3OH) have been mapped with spatial resolutions of 1 to 3 arcsec. Both spectra and maps present temporal modulations linked to the nucleus rotation period of 11.3 hours, showing the presence of rotating molecular structures in the coma. The rotating CO jet remains equally active during both day and night, indicating CO production from below the surface. The analysis of the radial distribution of the molecules shows that some species are not directly released from the nucleus. Best evidences are for H_2CO et SO. The comparaison between HCN and HNC maps shows that these two species have similar photodissociation lifetimes. Evidences that HNC is produced in the coma are seen, supporting its formation in the coma by chemical reactions, as proposed for explaining the heliocentric variation of its abundance. Simultaneous maps of several lines of CH_3OH at 241 GHz allow us to study the evolution of the rotation temperature with distance to nucleus. The coldest temperatures found in the outer coma agree with excitation model.
Biver Nicolas
Bockelée-Morvan Dominique
Colom Pierre
Crovisier Jacques
Despois Didier
No associations
LandOfFree
Interferometric imaging of molecular lines in comet Hale-Bopp 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 Interferometric imaging of molecular lines in comet Hale-Bopp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interferometric imaging of molecular lines in comet Hale-Bopp will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-815528