Article révisé par les pairs
Résumé : We report the first in situ detection of halogens in a cometary coma, that of 67P/Churyumov- Gerasimenko. Neutral gas mass spectra collected by the European Space Agency's Rosetta spacecraft during four periods of interest from the first comet encounter up to perihelion indicate that the main halogen-bearing compounds are HF, HCl and HBr. The bulk elemental abundances relative to oxygen are~8.9×10-5 for F/O,~1.2×10-4 forCl/O and~2.5×10-6 for Br/O, for the volatile fraction of the comet. The cometary isotopic ratios for 37Cl/35Cl and 81Br/79Br match the Solar system values within the error margins. The observations point to an origin of the hydrogen halides in molecular cloud chemistry, with frozen hydrogen halides on dust grains, and a subsequent incorporation into comets as the cloud condensed and the Solar system formed.

Documents en relation

DI-fusion

  • Distributed sources for the hydrogen halides in the coma of comet 67P/Churyumov- Gerasimenko
    par De Keyser, Johan , Dhooghe, Frederik , Altwegg, Kathrin , Balsiger, Hans , Berthelier, J.-J. , Briois, Christelle , Calmonte, Ursina , Cessateur, Gaël , Combi, Michael M.R. , Equeter, Eddy , Fiethe, Björn , Fuselier, S. A. , Gasc, Sebastian S G , Gibbons, Andrew , Gombosi, Tamás I. , Gunell, H. , Hässig, Myrtha , Le Roy, Léna , Maggiolo, Romain , Mall, Urs , Marty, Bernard , Neefs, Eddy , Rème, Henri , Rubin, Martin , Sémon, T. , Tzou, Chiayu C.Y. , Wurz, Peter
    Publication 2017-09
  • Hydrogen halides at Comet 67P/Churyumov-Gerasimenko as detected by ROSINA/DFMS
    par Dhooghe, Frederik , Altwegg, Kathrin , Balsiger, Hans , Berthelier, J.-J. , Briois, Christelle , Calmonte, Ursina , Cessateur, Gaël , Combi, Michael M.R. , Equeter, Eddy , Fiethe, Björn , Fuselier, S. A. , Gasc, Sebastian S G , Gibbons, Andrew , Gombosi, Tamás I. , Gunell, H. , Hässig, Myrtha , Le Roy, Léna , Maggiolo, Romain , Mall, Urs , Marty, Bernard , Neefs, Eddy , Rème, Henri , Rubin, Martin , Sémon, T. , Tzou, Chiayu C.Y. , Wurz, Peter
    Publication 2017-04
  • Hydrogen halides in the coma of 67P
    par Dhooghe, Frederik , Altwegg, Kathrin , Berthelier, Jean Jacques , Briois, Christelle , Calmonte, Ursina , Cessateur, Gaël , Combi, Michael M.R. , De Keyser, Johan , Equeter, Eddy , Fiethe, Björn , Fray, Nicolas , Fuselier, Stephen Anthony , Gibbons, Andrew , Gombosi, Tamás I. , Gunell, H. , Hässig, Myrtha , Hilchenbach, Martin , Le Roy, Léna , Maggiolo, Romain , Mall, Urs , Marty, Bernard , Neefs, Eddy , Rème, Henri , Rubin, Martin , Sémon, T. , Wurz, Peter
    Publication 2016-11
  • Distributed sources of hydrogen halides in the coma of comet 67P/Churyumov-Gerasimenko
    par De Keyser, Johan , Dhooghe, Frederik , Altwegg, Kathrin , Balsiger, Hans , Berthelier, Jean Jacques , Briois, Christelle , Calmonte, Ursina , Cessateur, Gaël , Combi, Michael M.R. , Equeter, Eddy , Fiethe, Björn , Fuselier, S. A. , Gasc, Sebastian S G , Gibbons, Andrew , Gombosi, Tamás I. , Gunell, H. , Hässig, Myrtha , Le Roy, Léna , Maggiolo, Romain , Mall, Urs , Marty, Bernard , Neefs, Eddy , Rème, Henri , Rubin, Martin , Sémon, T. , Tzou, Chiayu C.Y. , Wurz, Peter
    Publication 2017-06
  • Evidence for distributed gas sources of hydrogen halides in the coma of comet 67P/Churyumov-Gerasimenko
    par De Keyser, Johan , Dhooghe, Frederik , Altwegg, Kathrin , Balsiger, Hans , Berthelier, Jean Jacques , Briois, Christelle , Calmonte, Ursina , Cessateur, Gaël , Combi, Michael M.R. , Equeter, Eddy , Fiethe, Björn , Fuselier, S. A. , Gasc, Sebastian S G , Gibbons, Andrew , Gombosi, Tamás I. , Gunell, H. , Hässig, Myrtha , Le Roy, Léna , Maggiolo, Romain , Mall, Urs , Marty, Bernard , Neefs, Eddy , Rème, Henri , Rubin, Martin , Sémon, T. , Tzou, Chiayu C.Y. , Wurz, Peter
    Publication 2017