Imperial College London
Alternate

ProfessorMarinaGaland

Faculty of Natural Sciences, Department of Physics

Professor in Planetary Science
 
 
 
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Contact

 

m.galand Website

 
 
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Location

 

Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Beth:2020:0004-6361/201936775,
author = {Beth, A and Altwegg, K and Balsiger, H and Berthelier, J-J and Combi, MR and De, Keyser J and Fiethe, B and Fuselier, SA and Galand, M and Gombosi, TI and Rubin, M and Sémon, T},
doi = {0004-6361/201936775},
journal = {Astronomy and Astrophysics: a European journal},
pages = {1--23},
title = {ROSINA ion zoo at Comet 67P},
url = {http://dx.doi.org/10.1051/0004-6361/201936775},
volume = {642},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Context. The Rosetta spacecraft escorted Comet 67P/Churyumov-Gerasimenko for 2 yr along its journey through the Solar System between 3.8 and 1.24 au. Thanks to the high resolution mass spectrometer on board Rosetta, the detailed ion composition within a coma has been accurately assessed in situ for the very first time.Aims. Previous cometary missions, such as Giotto, did not have the instrumental capabilities to identify the exact nature of the plasma in a coma because the mass resolution of the spectrometers onboard was too low to separate ion species with similar masses. In contrast, the Double Focusing Mass Spectrometer (DFMS), part of the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis on board Rosetta (ROSINA), with its high mass resolution mode, outperformed all of them, revealing the diversity of cometary ions.Methods. We calibrated and analysed the set of spectra acquired by DFMS in ion mode from October 2014 to April 2016. In particular, we focused on the range from 13–39 u q−1. The high mass resolution of DFMS allows for accurate identifications of ions with quasi-similar masses, separating 13C+ from CH+, for instance.Results. We confirm the presence in situ of predicted cations at comets, such as CHm+ (m = 1−4), HnO+ (n = 1−3), O+, Na+, and several ionised and protonated molecules. Prior to Rosetta, only a fraction of them had been confirmed from Earth-based observations. In addition, we report for the first time the unambiguous presence of a molecular dication in the gas envelope of a Solar System body, namely CO2++.
AU  - Beth,A
AU  - Altwegg,K
AU  - Balsiger,H
AU  - Berthelier,J-J
AU  - Combi,MR
AU  - De,Keyser J
AU  - Fiethe,B
AU  - Fuselier,SA
AU  - Galand,M
AU  - Gombosi,TI
AU  - Rubin,M
AU  - Sémon,T
DO  - 0004-6361/201936775
EP  - 23
PY  - 2020///
SN  - 0004-6361
SP  - 1
TI  - ROSINA ion zoo at Comet 67P
T2  - Astronomy and Astrophysics: a European journal
UR  - http://dx.doi.org/10.1051/0004-6361/201936775
UR  - https://www.aanda.org/articles/aa/abs/2020/10/aa36775-19/aa36775-19.html
UR  - http://hdl.handle.net/10044/1/81755
VL  - 642
ER  -
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