[en] A full-mission analysis has been conducted of Cl-bearing species in the coma of comet 67P/Churyumov-Gerasimenko as detected by the Double Focusing Mass Spectrometer (DFMS) of Rosetta's ROSINA instrument. The isotope ratio of the two stable chlorine isotopes 37Cl/35Cl is found to be 0.336 ± 0.017, to be compared with the standard mean ocean chloride value of 0.320. The isotope ratio does not change appreciably throughout the mission. The Cl-bearing species fingerprint in DFMS indicates that there is at least one additional chlorine-bearing species in the coma next to HCl, CH3Cl, and NH4Cl. The identity of this volatile or semivolatile species is unknown at this time.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Dhooghe, Frederik; Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Ringlaan 3, B-1180 Brussels, Belgium
De Keyser, Johan; Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Ringlaan 3, B-1180 Brussels, Belgium ; Center for Mathematical Plasma Astrophysics, KULeuven, Celestijnenlaan 200B, B-3001 Heverlee, Belgium
Hänni, Nora; Physikalisches Institut, University of Bern, Sidlerstr 5, CH-3012 Bern, Switzerland
Altwegg, Kathrin; Physikalisches Institut, University of Bern, Sidlerstr 5, CH-3012 Bern, Switzerland ; Center for Space and Habitability, University of Bern, Sidlerstr 5, CH-3012 Bern, Switzerland
Cessateur, Gaël; Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Ringlaan 3, B-1180 Brussels, Belgium
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Maggiolo, Romain; Royal Belgian Institute for Space Aeronomy, BIRA-IASB, Ringlaan 3, B-1180 Brussels, Belgium
Rubin, Martin; Physikalisches Institut, University of Bern, Sidlerstr 5, CH-3012 Bern, Switzerland
Wurz, Peter; Physikalisches Institut, University of Bern, Sidlerstr 5, CH-3012 Bern, Switzerland ; Center for Space and Habitability, University of Bern, Sidlerstr 5, CH-3012 Bern, Switzerland)
Language :
English
Title :
Chlorine-bearing species and the 37Cl/35Cl isotope ratio in the coma of comet 67P/Churyumov-Gerasimenko
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