A search for parent molecules at millimetre wavelengths in Comets Austin 1990 V and Levy 1990 XX - Upper limits for undetected species

Details A search for parent molecules at millimetre wavelengths in Comets Austin 1990 V and Levy 1990 XX - Upper limits for undetected species A search for parent molecules at millimetre wavelengths in Comets Austin 1990 V and Levy 1990 XX - Upper limits for undetected species

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..527c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 527-540.

Astronomy and Astrophysics

Astrophysics

23

Austin Comet, Hydrocarbons, Microwave Spectra, Molecular Spectra, Millimeter Waves, Radio Telescopes, Comets, Parent Molecules, Austin, Levy, Microwaves, Wavelengths, Water, Radio Methods, Earth-Based Observations, Composition, Photodissociation, Dipole Moments, Spectroscopy, Molecules, Production Rate, Model, Spectra, Excitation, Hydrocarbons, Abundance, Nitrogen, Sulfur, Temperature, Sublimation

Scientific paper

The microwave spectra of Comets Austin 1990 V and Levy 1990 XX were observed with the IRAM 30-m radio telescope. As we have reported previously, the HCN, H2S, H2CO, and CH3OH molecules were detected. In addition, the lines of several other molecules of cometary interest were searched for without success, either during dedicated searches or serendipitously: H2O2, CH3CCH, HCOOH, C2H5OH, CH3OCH3, CH3COOH, HC3HO, HC3N, and many others. We report these searches in detail and evaluate the corresponding limits on the production rates. For several molecules, this limit is of the order of 0.001 relative to water, or less. The consequences for the nature of comets are discussed.

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