Spatial Distribution Of Molecules Observed In Comet Hale-bopp With The Iram Plateau De Bure Interferometer

Details Spatial Distribution Of Molecules Observed In Comet Hale-bopp With The Iram Plateau De Bure Interferometer Spatial Distribution Of Molecules Observed In Comet Hale-bopp With The Iram Plateau De Bure Interferometer

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.2009b&link_type=abstract

American Astronomical Society, DPS meeting #38, #20.09; Bulletin of the American Astronomical Society, Vol. 38, p.517

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Millimeter interferometry enables to study the spatial distribution of molecules in inner cometary atmospheres. In March 1997, with the IRAM Plateau de Bure Interferometer, unique data were obtained in comet C/1995 O1 (Hale-Bopp) with angular resolution of 1 to 3''. We have developed a model which simulates interferometric observations of the observed spectral lines. This model takes into account the optical depth effects, found to be significant in comet Hale-Bopp. It can accommodate any 3-D molecular spatial distribution as input parameters. We present here the analysis of the observed CO coma structure using physical models and that of CS, H2S and SO radial distribution assuming an isotropic outflow.
The traditionnal (non gas dynamical) analysis of CO observations suggested the presence of a nearly equatorial CO jet spiraling with nucleus rotation and comprising about 40% the total CO production (Henry et al. 2002). Rodionov and Crifo (2004) developed a time-dependent 3-D model of comet Hale-Bopp gas coma. They investigated first the case of a homogeneous outgassing of CO and H2O from a non-spherical rotating nucleus. A second computation assumes the presence of an area with increased CO production on the nucleus surface. We show that the structures created in the first case cannot explain the observations while those detected in the second case are comparable to observed ones. The study of the radial distribution of molecular species can provide constraints on their photodissociation rate, and, for radicals, on that of their parents. These rates are not well known for several species and we present results obtained for CS, SO and SO2.

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