DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

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.

[img] PDF - Only accessible within DLR

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


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
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIEDUNSPECIFIED
Debout, V.LESIA, Observatoire de Paris/CNRS/UPMC/Université Paris-Diderot, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Fougere, N.University of Michigan, Ann Harbor, MI 48109, USAUNSPECIFIEDUNSPECIFIED
Drossart, P.Observatoire de Paris, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Combi, M.Space Physics Research Laboratory, The University of Michigan, Ann Arbor, USAUNSPECIFIEDUNSPECIFIED
Schmitt, B.Grenoble Planetology LaboratoryUNSPECIFIEDUNSPECIFIED
Crovisier, J.Observatoire de Paris-Meudon, FranceUNSPECIFIEDUNSPECIFIED
De Sanctis, M.C.Istituto Nazionale di Astrofisica, Rome, Italy.UNSPECIFIEDUNSPECIFIED
Palomba, E.Institute for Interplanetary Space Physics - INAF, Rome, ItalyUNSPECIFIEDUNSPECIFIED
Taylor, F.W.University of OxfordUNSPECIFIEDUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIEDUNSPECIFIED
Finke, U.Lunar Planetary Laboratory, University of Arizona, Tucson, A2 85721-0092, USAUNSPECIFIEDUNSPECIFIED
Tozzi, G.Osservatorio Astrofisico di Arcetri, Firenze, ItalyUNSPECIFIEDUNSPECIFIED
Barucci, AntonellaObservatoire de Paris-Meudon, FranceUNSPECIFIEDUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIEDUNSPECIFIED
Combes, M.Observatoire de Paris, Meudon, FranceUNSPECIFIEDUNSPECIFIED
Ip, W-H.Institute for Space Science, National Central University, Chung Li, TaiwanUNSPECIFIEDUNSPECIFIED
Blecka, M.Polish Academi of Sciences, Warsaw, PolandUNSPECIFIEDUNSPECIFIED
Henry, FlorenceObservatoire de Paris-Meudon, FranceUNSPECIFIEDUNSPECIFIED
Jacquinod, S.Laboratoire d’Etudes Spatiales et d’Instrumentation en Astrophysique, Observatoire de Paris/CNRS/Université Pierre et Marie Curie/Université Paris-Diderot, Meudon, FranceUNSPECIFIEDUNSPECIFIED
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, FranceUNSPECIFIEDUNSPECIFIED
Semery, A.Observatoire de Paris Section de Meudon, FranceUNSPECIFIEDUNSPECIFIED
Tiphene, D.DESPA, Observatoire de Paris/Meudon, 92195 Meudon, FranceUNSPECIFIEDUNSPECIFIED
Date:30 October 2015
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:A6-1
Publisher:EDP Sciences
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 (old)
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

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.