NDLI: C/1995 O1 (Hale-Bopp): Gas Production Curves And Their Interpretation

Content Provider	Springer Nature Link
Author	BOCKELÉE MORVAN, D. RICKMAN, H.
Copyright Year	1997
Abstract	The discovery of C/1995 O1 (Hale-Bopp) at 7 AU from the Sun provided the first opportunity to follow the activity of a bright comet over a large range of heliocentric distances r$_{h}$. Production rates of a number of parent molecules and daughter species have been monitored both pre- and postperihelion. CO was found to be the major driver of the activity far from the Sun, surpassed by water within 3 AU whose production rate reached 10$^{31}$ s$^{−1}$ at perihelion. Gas production curves obtained for various species show several behaviours with r$_{h}$.Gas production curves contain important information concerning the physical state of cometary ices, the structure of the nucleus and all the processes taking place inside the nucleus leading to outgassing. They are relevant to the study of several other phenomena such as the sublimation from icy grains, dust mantling or seasonal effects. For some species, such as H$_{2}$CO or HNC, they permit to constrain their origin in the coma.We discuss models of subsurface gas production in distant comets and predictions of how such a source may vary as the comet moves along its orbit, approaching perihelion and receding again. Features in the observed gas production curves of comet Hale-Bopp are generally interpretable in terms of either subsurface production (typical example: CO at large r$_{h}$) or free sublimation (typical example: H$_{2}$O). Possible implications for the vertical stratification of the cometary ices are reviewed, and preference is found for a model with crystallization of amorphous ice close to the nuclear surface.
Starting Page	55
Ending Page	77
Page Count	23
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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