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Evolution of CO2, CH4, and OCS abundances relative to H2O in the coma of comet 67P around perihelion from Rosetta/VIRTIS-H observations

Bockelée-Morvan, Dominique and Crovisier, J. and Erard, S. and Capaccioni, F. and Leyrat, C. and Drossart, P. and Encrenaz, P. and Biver, N and De Sanctis, M.C. and Schmitt, B. and Kührt, Ekkehard and Capria, M.-T. and Combes, M. and Fougere, N: and Arnold, Gabriele E. and Fink, U. and Ip, W-H. and Migliorini, A. and Piccioni, G. and Tozzi, G. (2016) Evolution of CO2, CH4, and OCS abundances relative to H2O in the coma of comet 67P around perihelion from Rosetta/VIRTIS-H observations. Monthly Notices of the Royal Astronomical Society. Oxford University Press. DOI: 10.1093/mnras/stw2428 ISSN 0035-8711

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Abstract

Infrared observations of the coma of 67P/Churyumov–Gerasimenko were carried out from 2015 July to September, i.e. around perihelion (2015 August 13), with the high-resolution channel of the Visible and Infrared Thermal Imaging Spectrometer instrument onboard Rosetta. We present the analysis of fluorescence emission lines of H2O, CO2, 13CO2, OCS, and CH4 detected in limb sounding with the field of view at 2.7–5 km from the comet centre. Measurements are sampling outgassing from the illuminated Southern hemisphere, as revealed by H2O and CO2 raster maps, which show anisotropic distributions, aligned along the projected rotation axis. An abrupt increase of water production is observed 6 d after perihelion. In the meantime, CO2, CH4, and OCS abundances relative to water increased by a factor of 2 to reach mean values of 32, 0.47, and 0.18 per cent, respectively, averaging post-perihelion data. We interpret these changes as resulting from the erosion of volatile-poor surface layers. Sustained dust ablation due to the sublimation of water ice maintained volatile-rich layers near the surface until at least the end of the considered period, as expected for low thermal inertia surface layers. The large abundance measured for CO2 should be representative of the 67P nucleus original composition, and indicates that 67P is a CO2-rich comet. Comparison with abundance ratios measured in the Northern hemisphere shows that seasons play an important role in comet outgassing. The low CO2/H2O values measured above the illuminated Northern hemisphere are not original, but the result of the devolatilization of the uppermost layers.

Item URL in elib:https://elib.dlr.de/108175/
Document Type:Article
Title:Evolution of CO2, CH4, and OCS abundances relative to H2O in the coma of comet 67P around perihelion from Rosetta/VIRTIS-H observations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bockelée-Morvan, DominiqueLESIA, Observatoire de Paris, PSL Research University, FranceUNSPECIFIED
Crovisier, J.LESIA, Observatoire de Paris, PSL Research University, FranceUNSPECIFIED
Erard, S.LESIA, Observatoire de Paris, PSL Research University, FranceUNSPECIFIED
Capaccioni, F.INAF-IAPS, Istituto di Astrofisica e Planetologia Spaziali, ItalyUNSPECIFIED
Leyrat, C.LESIA, Observatoire de Paris, PSL Research UniversityUNSPECIFIED
Drossart, P.LESIA, Observatoire de Paris, PSL Research University, FranceUNSPECIFIED
Encrenaz, P.LESIA, Observatoire de Paris, PSL Research UniversityUNSPECIFIED
Biver, NLESIA, Observatoire de Paris, PSL Research University, FranceUNSPECIFIED
De Sanctis, M.C.istituto nazionale di astrofisica, rome, italy.UNSPECIFIED
Schmitt, B.grenoble planetology laboratoryUNSPECIFIED
Kührt, EkkehardInstitut für Planetenforschung, Berlin, GermanyUNSPECIFIED
Capria, M.-T.INAF-IAPS, Istituto di Astrofisica e Planetologia SpazialiUNSPECIFIED
Combes, M.LESIA, Observatoire de Paris, PSL Research UniversityUNSPECIFIED
Fougere, N:Department of Climate and Space Sciences and Engineering, University of Michigan, USAUNSPECIFIED
Arnold, Gabriele E.gabriele.arnold (at) dlr.deUNSPECIFIED
Fink, U.lunar planetary laboratory, univarsity of arizona, tucson, usaUNSPECIFIED
Ip, W-H.institute for space science, national central university, chung li, taiwanUNSPECIFIED
Migliorini, A.INAF-IAPS, Istituto di Astrofisica e Planetologia SpazialiUNSPECIFIED
Piccioni, G.INAF-IAPS, Istituto di Astrofisica e Planetologia SpazialiUNSPECIFIED
Tozzi, G.osservatorio astrofisico di arcetri, firenze, italyUNSPECIFIED
Date:2016
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1093/mnras/stw2428
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:comets: general: comets: individual: 67P/Churyumov–Gerasimenko: infrared: planetary systems
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente, R - Projekt ROSETTA Lander
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Schubert, Renate
Deposited On:24 Nov 2016 10:53
Last Modified:06 Sep 2019 15:17

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