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H/C elemental ratio of the refractory organic matter in cometary particles of 67P/Churyumov-Gerasimenko
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 630, pp.A27. ⟨10.1051/0004-6361/201834797⟩, European Planetary Science Congress 2018, European Planetary Science Congress 2018, Sep 2018, Berlin, Germany. 18 pp
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
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.
- Subjects :
- Physics
chemistry.chemical_classification
Astrochemistry
010504 meteorology & atmospheric sciences
Comet
[SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP]
Astronomy and Astrophysics
Context (language use)
Astrophysics
01 natural sciences
Secondary ion mass spectrometry
Meteorite
chemistry
13. Climate action
Space and Planetary Science
[SDU]Sciences of the Universe [physics]
0103 physical sciences
Atomic ratio
Organic matter
comets: individual: 67P/Churyumov-Gerasimenko / astrochemistry
010303 astronomy & astrophysics
Refractory (planetary science)
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 630, pp.A27. ⟨10.1051/0004-6361/201834797⟩, European Planetary Science Congress 2018, European Planetary Science Congress 2018, Sep 2018, Berlin, Germany. 18 pp
- Accession number :
- edsair.doi.dedup.....cce42813a4766adbdbb7eb63e93a2868
- Full Text :
- https://doi.org/10.1051/0004-6361/201834797⟩