16O/18O ratio in water in the coma of comet 67P/Churyumov-Gerasimenko measured with the Rosetta/ROSINA double-focusing mass spectrometer

Schroeder I, Isaac Raedwald Hans Garfield; Altwegg, Kathrin; Balsiger, Hans; Gasc, Sébastien; Rubin, Martin; Sémon, Thierry; Tzou, Chia-Yu; Wampfler, Susanne; Wurz, Peter (2018). 16O/18O ratio in water in the coma of comet 67P/Churyumov-Gerasimenko measured with the Rosetta/ROSINA double-focusing mass spectrometer (In Press). Astronomy and astrophysics EDP Sciences 10.1051/0004-6361/201833806

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The European Space Agency spacecraft Rosetta accompanied the Jupiter-family comet 67P/Churyumov-Gerasimenko for over two years along its trajectory through the inner solar system. Between 2014 and 2016, it performed almost continuous in-situ measurements of the comet's gaseous atmosphere in close proximity to its nucleus. In this study, the 16O/18O ratio of H2O in the coma of 67P/Churyumov-Gerasimenko, as measured by the ROSINA DFMS mass spectrometer on board Rosetta, was determined from the ratio of H2_16O / H2_18O and 16OH / 18OH. The value of 445 plus/minus 35 represents an approximately 11% enrichment of 18O compared with the terrestrial ratio of 498.7 plus/minus 0.1. This cometary value is consistent with the comet containing primordial water, in accordance with leading self-shielding models. These models predict primordial water to be between 5% to 20% enriched in heavier oxygen isotopes compared to terrestrial water.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
10 Strategic Research Centers > Center for Space and Habitability (CSH)

UniBE Contributor:

Schroeder I, Isaac Raedwald Hans Garfield; Altwegg, Kathrin; Balsiger, Hans; Gasc, Sébastien; Rubin, Martin; Sémon, Thierry; Tzou, Chia-Yu; Wampfler, Susanne and Wurz, Peter

Subjects:

500 Science > 520 Astronomy
500 Science > 530 Physics
600 Technology > 620 Engineering

ISSN:

0004-6361

Publisher:

EDP Sciences

Funders:

[4] Swiss National Science Foundation
[80] Kanton Bern
[UNSPECIFIED] ESA

Projects:

[UNSPECIFIED] Rosetta
[UNSPECIFIED] PRODEX

Language:

English

Submitter:

Schroeder I Isaac R.H.G.

Date Deposited:

12 Sep 2018 11:46

Last Modified:

04 Jun 2019 09:42

Publisher DOI:

10.1051/0004-6361/201833806

ArXiv ID:

1809.03798

Additional Information:

Rosetta Special

Uncontrolled Keywords:

Comets 67P Churyumov-Gerasimenko Rosetta ROSINA DFMS Oxygen

BORIS DOI:

10.7892/boris.119918

URI:

https://boris.unibe.ch/id/eprint/119918

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