ROSINA/DFMS and IES observations of 67P: Ion-neutral chemistry in the coma of a weakly outgassing comet
S. A. Fuselier
1, 2
K. Altwegg
3
H. Balsiger
3
Jean-Jacques Berthelier
4
A. Bieler
5
Christelle Briois
6
T. W. Broiles
1
James L. Burch
1
U. Calmonte
3
G. Cessateur
7
M. Combi
5
J. de Keyser
7
B. Fiethe
8
M. Galand
9
S. Gasc
3
Tamas I. Gombosi
5
H. Gunell
7
K. C. Hansen
5
M. Hässig
1
A. Jäckel
3
A. Korth
10
Léna Le Roy
3
U. Mall
10
K. E. Mandt
1
S. M. Petrinec
11
S. Raghuram
9
H. Rème
12
M. Rinaldi
1
M. Rubin
3
T. Sémon
3
K. J. Trattner
13
C.-Y. Tzou
3
Erik Vigren
14
J. H. Waite
1, 2
P. Wurz
3
S. A. Fuselier 1, 2
Mail :
Author
K. Altwegg 3
Author
H. Balsiger 3
Author
Jean-Jacques Berthelier 4
Mail :
Author
A. Korth 10
Author
Léna Le Roy 3
Mail :
Author IdHAL : lena-le-roy ORCID : https://orcid.org/0000-0002-5984-6153
U. Mall 10
Author
K. E. Mandt 1
Author
1
Space Science Division [San Antonio] (United States)
- SwRI - Southwest Research Institute [San Antonio] (6220 Culebra Rd, San Antonio, TX 78238 - United States)
2
UTSA Department of Physics and Astronomy [San Antonio] (United States)
- UTSA - The University of Texas at San Antonio (1 UTSA Circle, San Antonio, TX 78249 - United States)
3
Physikalisches Institut [Bern] (Sidlerstr. 5, 3012 Bern - Switzerland)
- Universität Bern [Bern] (Hochschulstrasse 4 - CH-3012 Bern - Switzerland)
4
IMPEC - LATMOS (France)
- LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales (11 boulevard d'Alembert
Quartier des Garennes
78280 - Guyancourt - France)
- UVSQ - Université de Versailles Saint-Quentin-en-Yvelines : UMR8190 (55 avenue de Paris - 78035 Versailles cedex - France)
- UPMC - Université Pierre et Marie Curie - Paris 6 : UMR8190 (4 place Jussieu - 75005 Paris - France)
- INSU - CNRS - Institut national des sciences de l'Univers : UMR8190 (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR8190 (France)
5
AOSS - Department of Atmospheric, Oceanic, and Space Sciences [Ann Arbor] (Ann Arbor, MI 48109 - United States)
- University of Michigan [Ann Arbor] (500 Church Street Ann Arbor, MI 48109-1090 - United States)
- University of Michigan System (Michigan - United States)
6
LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (3A, Avenue de la Recherche Scientifique 45071 Orléans cedex 2 - France)
- OSUC - Observatoire des Sciences de l'Univers en région Centre (Campus Géosciences, 1A rue de la Férollerie, 45071 Orléans - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - PSL Research University (France)
- UO - Université d'Orléans (Château de la Source - Avenue du Parc Floral - BP 6749 - 45067 Orléans cedex 2 - France)
- CNRS - Centre National de la Recherche Scientifique : UMS3116 (France)
- CNES - Centre National d’Études Spatiales [Paris] : UMR 7328 (Siège social : 2 place Maurice Quentin, 75039 Paris - France)
7
BIRA-IASB - Belgian Institute for Space Aeronomy / Institut d'Aéronomie Spatiale de Belgique (Ringlaan-3-Avenue Circulaire B-1180 Brussels - Belgium)
8
IDA - Institute of Computer and Network Engineering [Braunschweig] (Hans-Sommer-Street 66, 38106 Braunschweig - Germany)
- Technische Universität Braunschweig [Braunschweig] (38092 Braunschweig - Germany)
9
Imperial College London (South Kensington Campus, London SW7 2AZ - United Kingdom)
10
MPS - Max Planck Institute for Solar System Research (37077 Göttingen - Germany)
- Max-Planck-Gesellschaft (Jägerstrasse, 10-11, D-10117 Berlin - Germany)
11
ATC - Lockheed Martin Advanced Technology Center (3251 Hanover St, Palo Alto, CA 94304 - United States)
12
IRAP - Institut de recherche en astrophysique et planétologie (9 avenue Colonel Roche 31028 Toulouse - France)
- UT3 - Université Toulouse III - Paul Sabatier (118 route de Narbonne - 31062 Toulouse - France)
- Université Fédérale Toulouse Midi-Pyrénées (41 Allée Jules Guesde, 31000 Toulouse - France)
- OMP - Observatoire Midi-Pyrénées (14 avenue Edouard Belin, 31400 TOULOUSE - France)
- Université Fédérale Toulouse Midi-Pyrénées (41 Allée Jules Guesde, 31000 Toulouse - France)
- CNRS - Centre National de la Recherche Scientifique : UMR5277 (France)
13
LASP - Laboratory for Atmospheric and Space Physics [Boulder] (1234 Innovation Drive, Boulder, CO 80303-7814 - United States)
- University of Colorado [Boulder] (Boulder, Colorado 80309 - United States)
14
IRF - Swedish Institute of Space Physics [Uppsala] (Box 537 SE-751 21 Uppsala - Sweden)
Abstract : The Rosetta encounter with comet 67P/Churyumov-Gerasimenko provides a unique opportunity for an in situ, up-close investigation of ion-neutral chemistry in the coma of a weakly outgassing comet far from the Sun.
Observations of primary and secondary ions and modeling are used to investigate the role of ion-neutral chemistry within the thin coma.
Methods. Observations from late October through mid-December 2014 show the continuous presence of the solar wind 30 km from the comet nucleus. These and other observations indicate that there is no contact surface and the solar wind has direct access to the nucleus. On several occasions during this time period, the Rosetta/ROSINA/Double Focusing Mass Spectrometer measured the low-energy ion composition in the coma. Organic volatiles and water group ions and their breakup products (masses 14 through 19), CO2+ (masses 28 and 44) another mass peaks (at masses 26, 27 , and possibly 30) were observed. Secondary ions include H3O+ and HCO+ (masses 19 and 29). These secondary ions indicate ion-neutral chemistry in the thin coma of the comet. A relatively simple model is constructed to account for the low H3O+/H2O+ and HCO+/CO+ ratios observed in a water dominated coma. Results from this simple model are compared with results from models that include a more detailed chemical reaction network.
At low outgassing rates, predictions from the simple model agree with observations and with results from more complex models that include much more chemistry. At higher outgassing rates, the ion-neutral chemistry is still limited and high HCO+/CO+ ratios are predicted and observed. However, at higher outgassing rates, the model predicts high H3O+/H2O+ ratios and the observed ratios are often low. These low ratios may be the result of the highly heterogeneous nature of the coma, where CO and CO2 number densities can exceed that of water.
Document type :
Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-01199226
Contributor : Catherine Cardon <>
Submitted on : Wednesday, January 13, 2016 - 10:42:50 AM
Last modification on : Friday, January 10, 2020 - 9:09:51 PM
Document(s) archivé(s) le : Friday, November 11, 2016 - 3:53:46 AM
Contributor : Catherine Cardon <>
Submitted on : Wednesday, January 13, 2016 - 10:42:50 AM
Last modification on : Friday, January 10, 2020 - 9:09:51 PM
Document(s) archivé(s) le : Friday, November 11, 2016 - 3:53:46 AM
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- HAL Id : insu-01199226, version 1
- DOI : 10.1051/0004-6361/201526210
Collections
INSU | LPC2E | OSUC | CNRS | OMP-IRAP | UPMC | UVSQ | LATMOS | OMP | UNIV-ORLEANS | UNIV-PARIS-SACLAY | SORBONNE-UNIVERSITE | PSL | OBSPM | UNIV-TLSE3 | SU-SCIENCES
Citation
S. A. Fuselier, K. Altwegg, H. Balsiger, Jean-Jacques Berthelier, A. Bieler, et al.. ROSINA/DFMS and IES observations of 67P: Ion-neutral chemistry in the coma of a weakly outgassing comet. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 583, A2 (13 p.). ⟨10.1051/0004-6361/201526210⟩. ⟨insu-01199226⟩
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