Detection of Water Vapor in Comet 81P/Wild2 by Herschel

Details Detection of Water Vapor in Comet 81P/Wild2 by Herschel Detection of Water Vapor in Comet 81P/Wild2 by Herschel

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.0306d&link_type=abstract

American Astronomical Society, DPS meeting #42, #3.06; Bulletin of the American Astronomical Society, Vol. 42, p.946

Astronomy and Astrophysics

Astronomy

Scientific paper

Comet 81P/Wild2 was observed with HIFI on the Herschel Space Observatory in the framework of the guaranteed time key programme "Water and related chemistry in the Solar System" (KP-GT HssO). The observations were obtained in February 2010 about 20 days before perihelion at heliocentric distance of 1.61 AU. We mapped the fundamental 557 GHz ortho and 1113 GHz para rotational transitions of water with five point scans. We derive a mean water production rate of 1.0 x 1028 molecules/s in agreement with production rates measured from observations of the 18-cm OH lines at the Nançay radio telescope. The line shift and excess emission in the blue wing of the profiles suggest preferential outgassing towards the Sun.
These results are complemented by observations of HCN, CH3OH, H2S and CS obtained at the IRAM 30m telescope on 12-14 February and HCN observed at CSO in early January 2010.

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