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The Discovery of Argon in Comet C/1995 O1 (Hale-Bopp)

On 30.14 March 1997 we observed the EUV spectrum of the bright comet C/1995 O1 (Hale-Bopp) at the time of its perihelion, using our EUVS sounding rocket telescope/spectrometer. The spectra reveal the presence H Ly beta, O+, and, most notably, Argon. Modelling of the retrieved Ar production rates indicates that comet Hale-Bopp is enriched in Ar relative to cosmogonic expectations. This in turn indicates that Hale-Bopp's deep interior has never been exposed to the 35-40 K temperatures necessary to deplete the comet's primordial argon supply.

preprint2000arXivOpen access
S. A. SternD. C. SlaterM. C. FestouJ. Wm. ParkerG. R. Gladstone. M. F. A'HearnE. Wilkinson
astro-ph
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S. A. SternD. C. SlaterM. C. FestouJ. Wm. ParkerG. R. Gladstone. M. F. A'HearnE. Wilkinson

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