NDLI: Infrared Observations Of Volatile Molecules In Comet Hale-Bopp

Content Provider	Springer Nature Link
Author	Crovisier, J.
Copyright Year	1997
Abstract	Infrared observations of comets C/1996 B2 (Hyakutake) and C/1995 O1 (Hale-Bopp) benefited from the high spectral resolution and sensitivity of échelle spectrometers now equipping ground-based telescopes and from the availability of the Infrared Space Observatory (ISO).From the ground, several hydrocarbons were unambiguously detected for the first time: CH$_{4}$, C$_{2}$H$_{2}$, C$_{2}$H$_{6}$. Water was observed through several of its hot vibrational bands, escaping telluric absorption. CO, HCN, NH$_{3}$ and OCS were also observed, as well as several radicals. This permitted the evaluation of molecular production rates, of rotational temperature, and — taking advantage of the 1-D imaging of long-slit spectroscopy — of the space distribution of these species. With ISO, carbon dioxide was directly observed for the second time in a comet (after its detection from the Vega probes in P/Halley). The spectrum of water was investigated in detail (several bands of vibration and far-infrared rotational lines), permitting the evaluation of the rotational temperature of water, and of it spin temperature from the ortho-to-para ratio. Water ice was identified in the grains of Hale-Bopp as far as 7 AU from the ground and possibly at 3 AU with ISO. The composition of cometary volatiles appears to be strikingly similar to that of interstellar ices.
Starting Page	125
Ending Page	143
Page Count	19
File Format	PDF
ISSN	01679295
Journal	Earth, Moon, and Planets
Volume Number	79
Issue Number	1-3
e-ISSN	15730794
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Geophysics/Geodesy Planetology Remote Sensing/Photogrammetry Astronomy, Astrophysics and Cosmology
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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