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First observations of H2O and CO2vapor in comet 67P/Churyumov-Gerasimenko made by VIRTIS onboard Rosetta

Bockelee-Morvan, D. and Debout, V. and Erard, S. and Leyrat, C. and Capaccioni, F. and Filacchione, G. and Fougere, N. and Drossart, P. and Arnold, Gabriele and Combi, M. and Schmitt, B. and Crovisier, J. and De Sanctis, M.C. and Encrenaz, T. and Kührt, E. and Palomba, E. and Taylor, F.W. and Tosi, F. and Piccioni, G. and Finke, U. and Tozzi, G. and Barucci, Antonella and Biver, N and Capria, M. T. and Combes, M. and Ip, W-H. and Blecka, M. and Henry, Florence and Jacquinod, S. and Reess, J. M. and Semery, A. and Tiphene, D. (2015) First observations of H2O and CO2vapor in comet 67P/Churyumov-Gerasimenko made by VIRTIS onboard Rosetta. Astronomy & Astrophysics, 583, A6-1. EDP Sciences. doi: 10.1051/0004-6361/201526303. ISSN 0004-6361.

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Official URL: http://dx.doi.org/10.1051/0004-6361/201526303

Abstract

Context. Outgassing from cometary nuclei involves complex surface and subsurface processes that need to be understood to investigate the composition of cometary ices from coma observations. Aims. We investigate the production of water, carbon dioxide, and carbon monoxide from the nucleus of comet 67P/Churyumov-Gerasimenko (67P). These species have different volatility and are key species of cometary ices. Methods. Using the high spectral-resolution channel of the Visible InfraRed Thermal Imaging Spectrometer (VIRTIS-H), we observed the ν3 vibrational bands of H2O and CO2 at 2.67 and 4.27 μm, respectively, from 24 November 2014 to 24 January 2015, when comet 67P was between 2.91 and 2.47 AU from the Sun. Observations were undertaken in limb-viewing geometry at distances from the surface of 0 to 1.5 km and with various line-of-sight (LOS) orientations in the body-fixed frame. A geometry tool was used to characterize the position of the LOS with respect to geomorphologic regions and the illumination properties of these regions. Results. The water production of 67P did not increase much from 2.9 to 2.5 AU. High water column densities are observed for LOS above the neck regions, suggesting they are the most productive in water vapor. While water production is weak in regions with low solar illumination, CO2 is outgassing from both illuminated and non-illuminated regions, which indicates that CO2 sublimates at a depth that is below the diurnal skin depth. The CO2/H2O column density ratio varies from 2 to 60%. For regions that are in sunlight, mean values between 2 and 7% are measured. The lower bound value is likely representative of the CO2/H2O production rate ratio from the neck regions. For carbon monoxide, we derive column density ratios CO/H2O < 1.9% and CO/CO2< 80%. An illumination-driven model, with a uniformly active surface releasing water at a mean rate of 8 × 1025 s-1, provides an overall agreement to VIRTIS-H data, although some mismatches show local surface inhomogeneities in water production. Rotational temperatures of 90–100 K are derived from H2O and CO2 averaged spectra.

Item URL in elib:https://elib.dlr.de/101317/
Document Type:Article
Title:First observations of H2O and CO2vapor in comet 67P/Churyumov-Gerasimenko made by VIRTIS onboard Rosetta
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIED
Debout, V.LESIA, Observatoire de Paris/CNRS/UPMC/Université Paris-Diderot, Meudon, FranceUNSPECIFIED
Erard, S.LESIAUNSPECIFIED
Leyrat, C.LESIAUNSPECIFIED
Capaccioni, F.INAF-IASF, italyUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Fougere, N.University of Michigan, Ann Harbor, MI 48109, USAUNSPECIFIED
Drossart, P.Observatoire de Paris, Meudon, FranceUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Combi, M.Space Physics Research Laboratory, The University of Michigan, Ann Arbor, USAUNSPECIFIED
Schmitt, B.Grenoble Planetology LaboratoryUNSPECIFIED
Crovisier, J.Observatoire de Paris-Meudon, FranceUNSPECIFIED
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIED
Encrenaz, T.LESIAUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Palomba, E.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIED
Taylor, F.W.University of OxfordUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Piccioni, G.INAF-IASFUNSPECIFIED
Finke, U.Lunar Planetary Laboratory, University of Arizona, Tucson, A2 85721-0092, USAUNSPECIFIED
Tozzi, G.Osservatorio Astrofisico di Arcetri, Firenze, ItalyUNSPECIFIED
Barucci, AntonellaObservatoire de Paris-Meudon, FranceUNSPECIFIED
Biver, NObservatoire de ParisUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
Combes, M.Observatoire de Paris, Meudon, FranceUNSPECIFIED
Ip, W-H.Institute for Space Science, National Central University, Chung Li, TaiwanUNSPECIFIED
Blecka, M.Polish Academi of Sciences, Warsaw, PolandUNSPECIFIED
Henry, FlorenceObservatoire de Paris-Meudon, FranceUNSPECIFIED
Jacquinod, S.Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris/CNRS/Université Pierre et Marie Curie/Université Paris-Diderot, Meudon, FranceUNSPECIFIED
Reess, J. M.Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris/CNRS/Université Pierre et Marie Curie/Université Paris-Diderot, Meudon, FranceUNSPECIFIED
Semery, A.Observatoire de Paris Section de Meudon, FranceUNSPECIFIED
Tiphene, D.DESPA, Observatoire de Paris/Meudon, 92195 Meudon, FranceUNSPECIFIED
Date:30 October 2015
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:583
DOI :10.1051/0004-6361/201526303
Page Range:A6-1
Publisher:EDP Sciences
ISSN:0004-6361
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 Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project ROSETTA Instruments
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Institute of Planetary Research > Asteroids and Comets
Deposited By: Kappel, David
Deposited On:07 Jan 2016 08:28
Last Modified:08 Mar 2018 18:22

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