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  H/C elemental ratio of the refractory organic matter in cometary particles of 67P/Churyumov-Gerasimenko

Isnard, R., Bardyn, A., Fray, N., Briois, C., Cottin, H., Paquette, J., et al. (2019). H/C elemental ratio of the refractory organic matter in cometary particles of 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics, 630: A27. doi:10.1051/0004-6361/201834797.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-68C7-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-68C8-4
Genre: Journal Article

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 Creators:
Isnard, R., Author
Bardyn, A., Author
Fray, N., Author
Briois, C., Author
Cottin, H., Author
Paquette, John1, Author              
Stenzel, Oliver Joachim1, Author              
Alexander, C., Author
Baklouti, D., Author
Engrand, C., Author
Orthous-Daunay, F.-R., Author
Siljeström, S., Author
Varmuza, K., Author
Hilchenbach, Martin1, Author              
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: Context. Because comets are part of the most primitive bodies of our solar system, establishing their chemical composition and comparing them to other astrophysical bodies gives new constraints on the formation and evolution of organic matter throughout the solar system. For two years, the time-of-flight secondary ion mass spectrometer COmetary Secondary Ion Mass Analyzer (COSIMA) on board the Rosetta orbiter performed in situ analyses of the dust particles ejected from comet 67P/Churyumov-Gerasimenko (67P). Aims. The aim is to determine the H/C elemental ratio of the refractory organic component contained in cometary particles of 67P. Methods. We analyzed terrestrial and extraterrestrial calibration samples using the COSIMA ground-reference model. Exploiting these calibration samples, we provide calibration lines in both positive and negative ion registration modes. Thus, we are now able to measure the cometary H/C elemental ratio. Results. The mean H/C value is 1.04 ± 0.16 based on 33 different cometary particles. Consequently, the H/C atomic ratio is on average higher in cometary particles of 67P than in even the most primitive insoluble organic matter extracted from meteorites. Conclusions. These results imply that the refractory organic matter detected in dust particles of 67P is less unsaturated than the material in meteorites.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1051/0004-6361/201834797
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 630 Sequence Number: A27 Start / End Page: - Identifier: Other: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1