Journal articles
Sulphur isotope mass-independent fractionation observed in comet 67P/Churyumov–Gerasimenko by Rosetta/ROSINA
Ursina Calmonte
1
Kathrin Altwegg
1, 2
H. Balsiger
1
Jean-Jacques Berthelier
3
A. Bieler
4, 1
Johan de Keyser
5
B. Fiethe
6
S. A. Fuselier
7, 8
S. Gasc
1
Tamas I. Gombosi
4
Léna Le Roy
1
Martin Rubin
1
T. Sémon
1
C.-Y. Tzou
1
S. F. Wampfler
2
Ursina Calmonte 1
Mail :
Author
Kathrin Altwegg 1, 2
Mail :
Author
H. Balsiger 1
Author
Jean-Jacques Berthelier 3
Mail :
Author
S. Gasc 1
Author
Tamas I. Gombosi 4
Author
Léna Le Roy 1
Mail :
Author IdHAL : lena-le-roy ORCID : https://orcid.org/0000-0002-5984-6153
Martin Rubin 1
Author
1
Physikalisches Institut [Bern] (Sidlerstr. 5, 3012 Bern - Switzerland)
- Universität Bern [Bern] (Hochschulstrasse 4 - CH-3012 Bern - Switzerland)
2
CSH - Center for Space and Habitability (University of Bern,
Hochschulstrasse 4,
3012 Bern - Switzerland)
- University of Bern (Hochschulstrasse 4, 3012 Bern, Switzerland - Switzerland)
3
IMPEC - LATMOS (France)
- LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales (11 boulevard d'Alembert
Quartier des Garennes
78280 - Guyancourt - France)
- UVSQ - Université de Versailles Saint-Quentin-en-Yvelines : UMR8190 (55 avenue de Paris - 78035 Versailles cedex - France)
- UPMC - Université Pierre et Marie Curie - Paris 6 : UMR8190 (4 place Jussieu - 75005 Paris - France)
- INSU - CNRS - Institut national des sciences de l'Univers : UMR8190 (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR8190 (France)
4
AOSS - Department of Atmospheric, Oceanic, and Space Sciences [Ann Arbor] (Ann Arbor, MI 48109 - United States)
- University of Michigan [Ann Arbor] (500 Church Street Ann Arbor, MI 48109-1090 - United States)
- University of Michigan System (Michigan - United States)
5
BIRA-IASB - Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (Ringlaan-3-Avenue Circulaire B-1180 Brussels - Belgium)
6
IDA - Institute of Computer and Network Engineering [Braunschweig] (Hans-Sommer-Street 66, 38106 Braunschweig - Germany)
- Technische Universität Braunschweig [Braunschweig] (38092 Braunschweig - Germany)
7
Space Science and Engineering Division [San Antonio] (San Antonio, TX 78238 - United States)
- SwRI - Southwest Research Institute [San Antonio] (6220 Culebra Rd, San Antonio, TX 78238 - United States)
8
UTSA Department of Physics and Astronomy [San Antonio] (United States)
- UTSA - The University of Texas at San Antonio (1 UTSA Circle, San Antonio, TX 78249 - United States)
Abstract : The knowledge about sulphur isotopic fractionation in volatile cometary species is limited as only measurements in five comets have been done and only for 34S/32S. The lack of information about the fractionation of 33S/32S makes it impossible to compare them with what is known from refractories. We present results of 34S/32S and for the first time 33S/32S isotopic ratio in H2S, OCS, and CS2 in the coma of comet 67P/Churyumov-Gerasimenko. Observations used for this study were performed with Rosetta Orbiter Spectrometer for Ion and Neutral Analysis/Double Focusing Mass Spectrometer during October 2014 and May 2016. Bulk isotopic 33S/32S and 34S/32S ratio derived from these three species yield δ33S = (-302 ± 29)‰ and δ34S = (-41 ± 17)‰ respectively. The observed isotopic fractionation is significantly different from the solar system standard (V-CDT) and all other reported values for solar system objects, except other comets. Furthermore we show that neither mass dependent nor mass-independent fractionation due to photo dissociation as it has been observed in recent laboratory studies can be the cause of the significant depletion compared to solar system standard. In addition, we conclude that there seems to be an intrinsic difference in sulphur isotopic fractionation in cometary volatiles and refractories while the difference between molecules is most likely due to different chemical pathways. The significant fractionation of sulphur isotopes together with a high D2O/HDO vs. HDO/H2O and non-solar isotopic ratio for xenon (Marty 2017) as well as for Si (Marty 2017) point towards a non-homogeneously mixed protosolar nebula.
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Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-01671992
Contributor : Catherine Cardon <>
Submitted on : Friday, December 22, 2017 - 6:18:21 PM
Last modification on : Friday, January 10, 2020 - 3:42:30 PM
Contributor : Catherine Cardon <>
Submitted on : Friday, December 22, 2017 - 6:18:21 PM
Last modification on : Friday, January 10, 2020 - 3:42:30 PM
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- HAL Id : insu-01671992, version 1
- DOI : 10.1093/mnras/stx2534
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INSU | CNRS | LATMOS | UPMC | UVSQ | UNIV-PARIS-SACLAY | SORBONNE-UNIVERSITE | SU-SCIENCES
Citation
Ursina Calmonte, Kathrin Altwegg, H. Balsiger, Jean-Jacques Berthelier, A. Bieler, et al.. Sulphur isotope mass-independent fractionation observed in comet 67P/Churyumov–Gerasimenko by Rosetta/ROSINA. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2017, 469 (suppl_2), pp.S787-S803. ⟨10.1093/mnras/stx2534⟩. ⟨insu-01671992⟩
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