Spectroscopic evidence for interstellar ices in comet Hyakutake.
Nature
; 383(6599): 418-20, 1996 Oct 03.
Article
em En
| MEDLINE
| ID: mdl-8837771
ABSTRACT
Volatile compounds in comets are the most pristine materials surviving from the time of formation of the Solar System, and thus potentially provide information about conditions that prevailed in the primitive solar nebula. Moreover, comets may have supplied a substantial fraction of the volatiles on the terrestrial planets, perhaps including organic compounds that played a role in the origin of life on Earth. Here we report the detection of hydrogen isocyanide (HNC) in comet Hyakutake. The abundance of HNC relative to hydrogen cyanide (HCN) is very similar to that observed in quiescent interstellar molecular clouds, and quite different from the equilibrium ratio expected in the outermost solar nebula, where comets are thought to form. Such a departure from equilibrium has long been considered a hallmark of gas-phase chemical processing in the interstellar medium, suggesting that interstellar gases have been incorporated into the comet's nucleus, perhaps as ices frozen onto interstellar grains. If this interpretation is correct, our results should provide constraints on the temperature of the solar nebula, and the subsequent chemical processes that occurred in the region where comets formed.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cianeto de Hidrogênio
/
Meteoroides
/
Meio Ambiente Extraterreno
Idioma:
En
Revista:
Nature
Ano de publicação:
1996
Tipo de documento:
Article
País de afiliação:
Estados Unidos