OH Vibrational Prompt Emission and Water Hot-Band Fluorescent Emission in C/2000 WM1 (LINEAR)

Details OH Vibrational Prompt Emission and Water Hot-Band Fluorescent Emission in C/2000 WM1 (LINEAR) OH Vibrational Prompt Emission and Water Hot-Band Fluorescent Emission in C/2000 WM1 (LINEAR)

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004dps....36.2304b&link_type=abstract

American Astronomical Society, DPS meeting #36, #23.04; Bulletin of the American Astronomical Society, Vol. 36, p.1121

Astronomy and Astrophysics

Astronomy

Scientific paper

Two methods for deriving cometary water production rates from ground-based high-resolution near-infrared spectra have now been developed. The water molecule can be directly sampled through "hot-band" fluorescent emission near 2.0, 2.9, 4.6, and 5.0 μ m [1]. Knowledge of the H2O rotational temperature and ortho-to-para ratio is needed to fully constrain its production rate via this method. More recently, vibrational prompt emission from OH has also been used as a proxy for water production. This method depends on the accuracy of the OH emission efficiencies derived from simultaneous observations of H2O and OH in comets C/1999 H1 (Lee) and C/2001 A2 (Linear) [2].
We report water production rates for a third comet (C/2000 WM1) based on independent analyses of H2O hot-band lines near 2.9 μ m and of OH prompt emission lines near 3046 cm-1, observed with NIRSPEC at the W. M. Keck Observatory. This comparison further reveals the capabilities and potential limitations of the two methods, while placing a special emphasis on the newer OH-based method.
This work was supported by grants to M. J. Mumma (RTOP 344-32-30-07) and to H. A. Weaver and G. Chin (NAG5-12230) under NASA's Planetary Astronomy Program, and to N. Dello Russo (NAG5-10795) under NASA's Planetary Atmospheres Program.
[1] Dello Russo et al. 2002, JGR, 107 (E11) 5095. [2] Bonev et al. 2004, ApJ, in press.

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