A Retrospective Search For NH3 Infrared Emission In Comets, And Its Relation To NH2.

Details A Retrospective Search For NH3 Infrared Emission In Comets, And Its Relation To NH2. A Retrospective Search For NH3 Infrared Emission In Comets, And Its Relation To NH2.

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.5316m&link_type=abstract

American Astronomical Society, DPS meeting #39, #53.16; Bulletin of the American Astronomical Society, Vol. 39, p.523

Astronomy and Astrophysics

Astronomy

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Scientific paper

NH3 is the dominant (observable) nitrogen-containing volatile in comets, present at 1% relative to water. At infrared wavelengths (ν1 band), NH3 is difficult to detect since it requires a significant geocentric velocity to shift the strongest NH3 emissions out of the terrestrial atmospheric water absorption. Only a few comets have offered a Doppler shift sufficient to observe the strongest Q-branch lines. Previously, we applied and tested our model of fluorescence efficiency factors for NH3 in C/2002 T7 (LINEAR). The high Doppler shift (- 66 km/s) of C/T7 during early May 2005 made it an excellent target for searching for NH3 through its strongest IR emission lines.
NH3 might also be sensed through prompt emission of its daughter NH2, similar to the process leading to OH prompt emission following photolysis of H2O. We revisit our highest quality data sets (obtained with CSHELL (NASA IRTF) and NIRSPEC (Keck 2)) to search for weaker emission lines of ammonia. We also quantify the presence of NH2 within these spectra, and relate it to the possible presence of NH3. When strong NH2 emission is present, we examine its spatial profile about the nucleus to investigate whether there is evidence for prompt emission.

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