Deuterium in Comet C/1995 O1 (Hale-Bopp)

Details Deuterium in Comet C/1995 O1 (Hale-Bopp) Deuterium in Comet C/1995 O1 (Hale-Bopp)

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.3710m&link_type=abstract

American Astronomical Society, DPS meeting #29, #37.10; Bulletin of the American Astronomical Society, Vol. 29, p.1048

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Scientific paper

We report on sub-mm observations of HDO and DCN in comet C/1995 O1 (Hale-Bopp). Both deuterated species have been observed with the 15 m James Clerk Maxwell Telescope on Mauna Kea. On 1997 April 4.9 (UT) we detected the HDO ground-state transition 101 - 000 at 464.925 GHz. The main-beam corrected line area was T_B Delta V = 1.21 +/- 0.21 K km s(-1) . A detailed model that includes all major excitation mechanisms reveals a D/H in H_2O similar to what has been found in other potential Oort cloud comets 1P/Halley and C/1996 B2 (Hyakutake). Three weeks later we made a 10sigma detection of the DCN 5-4 transition at 362.046 GHz, showing that deuterium is more abundant in cometary HCN than cometary H_2O. This is the first detection of cometary deuterium in a species other than water. The fact that the D/H ratio varies significantly from species to species provides convincing evidence in favor of the interstellar origin of cometary ices and the concomitant absence of extensive radial mixing in the early solar nebula. Based on calculations of ion-molecule reactions in interstellar clouds, the observed D/H ratios suggest a kinetic formation temperature in the range of 25 to 45 K. This temperature is distinctly higher than a temperature of ~ 10 K typically found in dark interstellar clouds.

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