Observations of Parent Molecules in Comets at Radio Wavelengths: HCN, H2S, H2CO and CH3OH
نویسندگان
چکیده
منابع مشابه
the CO, HCN, H2O and H2CO molecules.
Detailed semi-empirical interaction potential calculations are performed to determine the potential energy surface experienced by the molecules CO, HCN, H2O and H2CO, when adsorbed on the basal plane (0001) of graphite at low temperature. The potential energy surface is used to find the equilibrium site and configuration of a molecule on the surface and its corresponding adsorption energy. The ...
متن کاملObservations of molecules in comets
Comets are among the most primitive bodies of the Solar System, and their chemical composition is rich in information on the protosolar nebula and its possible connection with interstellar cloud chemistry. Comets are also a source of light atoms and probably of prebiotic organic molecules for the early Earth. We know better and better cometary volatiles through spectroscopy, mainly at infrared ...
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We obtained high resolution (λ/δλ∼ 10,000–20,000) infrared (IR) spectra of Comet 21P/Giacobini–Zinner (GZ) at five different wavelengths between 1.9 and 5.0 μm during 25–29 October 1998 using CSHELL at the NASA Infrared Telescope Facility (IRTF) on Mauna Kea. We also obtained a moderate resolution (λ/δλ∼ 680) spectrum covering the wavelength range from 3.082 to 3.720 μm on 29 October 1998 using...
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We use a multifluid hydrodynamical-chemical model of cometary comae to predict the HNC and HCN abundances in comets Hyakutake and Hale-Bopp for a variety of initial parameters. We find, in general, that the presence of methanol in the nuclear ices inhibits the synthesis of HNC from HCN through proton transfer reactions in the coma. For Hale-Bopp, we find that because of the large gas production...
متن کاملMapping the Release of Volatiles in the Inner Comae of Comets C/2012 F6 (lemmon) and C/2012 S1 (ison) Using the Atacama Large Millimeter/submillimeter Array
Results are presented from the first cometary observations using the Atacama Large Millimeter/Submillimeter Array (ALMA), including measurements of the spatially-resolved distributions of HCN, HNC, H2CO and dust within the comae of two comets: C/2012 F6 (Lemmon) and C/2012 S1 (ISON), observed at heliocentric distances of 1.5 AU and 0.54 AU, respectively. These observations (with angular resolut...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1992
ISSN: 0074-1809
DOI: 10.1017/s0074180900090628