The oxygen isotopic composition (18O/16O) in the dust of comet 67P/Churyumov-Gerasimenko measured by COSIMA on-board Rosetta
J Silen; J A Paquette; J Kissel; The Cosima Team; J Rynö; O J Stenzel; C Engrand; N Fray; M Hilchenbach
https://urn.fi/URN:NBN:fi-fe2021042822172
Tiivistelmä
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.
Kokoelmat
- Rinnakkaistallenteet [19207]