The oxygen isotopic composition (18O/16O) in the dust of comet 67P/Churyumov-Gerasimenko measured by COSIMA on-board Rosetta

J.A. Paquette; C. Engrand; J Hilchenbach; C Fray; J Stenzel; J Silen; J Rynö; J Kissel; The Cosima Team

The oxygen isotopic composition (18O/16O) in the dust of comet 67P/Churyumov-Gerasimenko measured by COSIMA on-board Rosetta

J.A. Paquette ¹ C. Engrand ² J Hilchenbach ¹ C Fray ³ J Stenzel ¹ J Silen ⁴ J Rynö ⁴ J Kissel ¹ The Cosima Team ⁵

1 MPS - Max-Planck-Institut für Sonnensystemforschung

2 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse

3 LISA - Laboratoire inter-universitaire des systèmes atmosphèriques

4 FMI - Finnish Meteorological Institute

5 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace

Abstract : The oxygen isotopic ratio 18O/16O has been measured in cometary gas for a wide variety of comets, but the only measurements in cometary dust were performed by the Stardust cometary sample return mission. Most such measurements find a value of the ratio that is consistent with Vienna Standard Mean Ocean Water (VSMOW) within errors. In this work we present the result of a measurement, using the COSIMA (the COmetary Secondary Ion Mass Analyser) instrument on the Rosetta orbiter, of the oxygen isotopic ratio in dust from Comet 67P/Churyumov-Gerasimenko. Measuring the 18O/16O ratio with COSIMA is challenging for a number of reasons, but it is possible with a reasonable degree of precision. We find a result of 2.00 × 10−3 ± 1.2 × 10−4, which is consistent within errors with VSMOW.

Keywords : comets: general – comets: individual: 67P/Churyumov-Gerasimenko – planetary systems.

Document type :

Journal articles

Domain :

Sciences of the Universe [physics]

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The oxygen isotopic composition (18O/16O) in the dust of comet 67P/Churyumov-Gerasimenko measured by COSIMA on-board Rosetta

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The oxygen isotopic composition (18O/16O) in the dust of comet 67P/Churyumov-Gerasimenko measured by COSIMA on-board Rosetta

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