Weak H2O emission lines in Comet 8P/Tuttle require changes to the excitation model

Details Weak H2O emission lines in Comet 8P/Tuttle require changes to the excitation model Weak H2O emission lines in Comet 8P/Tuttle require changes to the excitation model

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008epsc.conf..826b&link_type=abstract

European Planetary Science Congress 2008, Proceedings of the conference held 21-25 September, 2008 in Münster, Germany. Online a

Physics

Scientific paper

High resolution spectra of Comet 8P/Tuttle were obtained in the frequency range 3440.6-3462.6 cm -1 on UT 3 January 2008 using CGS4 with echelle grating on UKIRT. In addition to recording strong solar pumped fluorescent (SPF) lines of H2O, the long integration time (152 minutes on target) enabled a number of weaker H2O features to be assigned using the BT2 water line list [1], most of which had not previously identified in cometary spectra. These transitions, which are from higher energy upper states, are similar in character to the so-called `SH' lines recorded in the post Deep Impact spectrum of Comet Tempel 1 [2] suggesting an alternative molecular excitation mechanism.

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