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67P/Churyumov-Gerasimenko, a Jupiter family comet with a high D/H ratio
Altwegg, K.; Balsiger, H.; Bar-Nun, A.; Berthelier, J.J.; Bieler, A.; Bochsler, P.; Briois, C.; Calmonte, U.; Combi, M.; De Keyser, J.; Eberhardt, P.; Fiethe, B.; Fuselier, S.; Gasc, S.; Gombosi, T.I.; Hansen, K.C.; Hassig, M.; Jackel, A.; Kopp, E.; Korth, A.; Leroy, L.; Mall, U.; Marty, B.; Mousis, O.; Neefs, E.; Owen, T.; Reme, H.; Rubin, M.; Semon, T.; Tzou, C.-Y.; Waite, H.; Wurz, P. (2015). 67P/Churyumov-Gerasimenko, a Jupiter family comet with a high D/H ratio. Science (Wash.) 347(6220): 3.
In: Science (Washington). American Association for the Advancement of Science: New York, N.Y. ISSN 0036-8075; e-ISSN 1095-9203, more
Peer reviewed article  

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  • Altwegg, K.
  • Balsiger, H.
  • Bar-Nun, A.
  • Berthelier, J.J.
  • Bieler, A.
  • Bochsler, P.
  • Briois, C.
  • Calmonte, U.
  • Combi, M.
  • De Keyser, J., more
  • Eberhardt, P.
  • Fiethe, B.
  • Fuselier, S.
  • Gasc, S.
  • Gombosi, T.I.
  • Hansen, K.C.
  • Hassig, M.
  • Jackel, A.
  • Kopp, E.
  • Korth, A.
  • Leroy, L.
  • Mall, U.
  • Marty, B.
  • Mousis, O.
  • Neefs, E.
  • Owen, T.
  • Reme, H.
  • Rubin, M.
  • Semon, T.
  • Tzou, C.-Y.
  • Waite, H.
  • Wurz, P.

    The provenance of water and organic compounds on Earth and other terrestrial planets has been discussed for a long time without reaching a consensus. One of the best means to distinguish between different scenarios is by determining the deuterium-to-hydrogen (D/H) ratios in the reservoirs for comets and Earth’s oceans. Here, we report the direct in situ measurement of the D/H ratio in the Jupiter family comet 67P/Churyumov-Gerasimenko by the ROSINA mass spectrometer aboard the European Space Agency’s Rosetta spacecraft, which is found to be (5.3 ± 0.7) × 10−4—that is, approximately three times the terrestrial value. Previous cometary measurements and our new finding suggest a wide range of D/H ratios in the water within Jupiter family objects and preclude the idea that this reservoir is solely composed of Earth ocean–like water.

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