Isotopic abundances of carbon and nitrogen in jupiter-family and oort cloud comets

  title={Isotopic abundances of carbon and nitrogen in jupiter-family and oort cloud comets},
  author={Damien Hutsem{\'e}kers and Jean Manfroid and Emmanuel Jehin and Claude Arpigny and Anita L. Cochran and Rita M. Schulz and J. A. Stuwe and J. M. Zucconi},
  journal={Astronomy and Astrophysics},
The 12 C 14 N/ 12 C 15 N and 12 C 14 N/ 13 C 14 N isotopic ratios are determined for the first time in a Jupiter-family comet, 88P/1981 Ql Howell, and in the chemically peculiar Oort Cloud comet C/1999 S4 (LINEAR). By comparing these measurements to previous ones derived for six other Oort Cloud comets (including one of Halley-type), we find that both the carbon and nitrogen isotopic ratios are constant within the uncertainties. The mean values are 12 C/ 13 C ≃ 90 and 14 N/ 15 N ≃ 145 for the… 

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