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The Seasonal Cycle of Water Ice at the Surface of Comet 67P/Churyumov-Gerasimenko as Observed by Virtis Onboard Rosetta

Ciarniello, M. and Filacchione, G. and Capaccioni, F. and Desanctis, M.C. and Capria, M. T. and Raponi, A. and Tosi, F. and Formisano, M. and Longobardo, A and Rinaldi, G. and Erard, S. and Bockelee-Morvan, D. and Leyrat, C. and Arnold, Gabriele and Barucci, M. A. and Quirico, E. and Fornasier, S. and Kappel, David and Rousseau, Batiste and Mottola, Stefano (2018) The Seasonal Cycle of Water Ice at the Surface of Comet 67P/Churyumov-Gerasimenko as Observed by Virtis Onboard Rosetta. In: AOGS 15th Annual Meeting, PS19-A010. AOGS 15th Annual Meeting, 03 - 08 Jun 2018, Honolulu, Hawaii, USA.

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Official URL: http://www.asiaoceania.org/aogs2018

Abstract

Rosetta was the first mission escorting a comet, 67P/Churyumov-Gerasimenko, for two years along its orbit (August 2014 - September 2016). This allowed us to follow the evolution of the nucleus surface and activity as 67P was approaching the Sun from a heliocentric distance of 3.62 AU to 1.25 AU (perihelion), and along the outbound part of the orbit up to 3.8 AU. Here we report about the observations performed by the VIRTIS instrument (Coradini et al., 2007), which investigated the nucleus surface composition by means of its reflectance spectrum in the 0.2-5.1 micron wavelength range. Results from Filacchione et al. (2016), for the pre-landing phase (August 2014-November 2014), extended to observations until early May 2015 by Ciarniello et al. (2016), indicate a global enrichment of surface water ice content, as inferred from analysis of comet spectral indicators (such as slope in the VIS and IR ranges, and the 3.2 micron band area and band center). Recent analysis from Ciarniello et al. (in preparation), carried out by means of the sole VIS channel (0.24-1.04 micron) shows that the water ice enrichment continues up to perihelion, then followed by a monotonic reduction of water ice abundance, as indicated by a progressive increase of the VIS spectral slope. In April 2016, on the outbound leg of the orbit at 2.9 AU, a plateau was reached, followed by a possible enrichment of water ice until the end of mission in September 2016 at 3.8 AU. The described behavior suggests the presence of a seasonal cycle of water ice on the surface. These results will be compared to the temporal variability of dust production with the aim to characterize the thermo-physical processes influencing the surface water ice content.

Item URL in elib:https://elib.dlr.de/124862/
Document Type:Conference or Workshop Item (Speech)
Title:The Seasonal Cycle of Water Ice at the Surface of Comet 67P/Churyumov-Gerasimenko as Observed by Virtis Onboard Rosetta
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ciarniello, M.INAF-IASF, ItalyUNSPECIFIED
Filacchione, G.INAF-IASF, Rome, ItalyUNSPECIFIED
Capaccioni, F.INAF-IASF, italyUNSPECIFIED
Desanctis, M.C.INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
Raponi, A.INAF-IASF, ItalyUNSPECIFIED
Tosi, F.INAF-IASF Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma ItalyUNSPECIFIED
Formisano, M.INAF-IASF, ItalyUNSPECIFIED
Longobardo, AINAF-LAPS, Via del Fosso del Cavaliere 100, I-00133 Rome, ItalyUNSPECIFIED
Rinaldi, G.Istituto di Fisica dello Spazio Interplanetario (IFSI-INAF), Rome - ItalyUNSPECIFIED
Erard, S.LESIAUNSPECIFIED
Bockelee-Morvan, D.Observatoire de Paris, MeudonUNSPECIFIED
Leyrat, C.LESIAUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Barucci, M. A.Observatoire de Paris, Meudon, FranceUNSPECIFIED
Quirico, E.Laboratory of Planetology, CNRS Joseph Fourier UniversityUNSPECIFIED
Fornasier, S.LESIA, Obs. de Paris, CNRS, Univ Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195 Meudon, FranceUNSPECIFIED
Kappel, DavidDavid.Kappel (at) dlr.dehttps://orcid.org/0000-0002-0518-5548
Rousseau, BatisteLESIAUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Date:8 June 2018
Journal or Publication Title:AOGS 15th Annual Meeting
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:PS19-A010
Status:Published
Keywords:Comet 67P, VIRTIS, Rosetta, Composition
Event Title:AOGS 15th Annual Meeting
Event Location:Honolulu, Hawaii, USA
Event Type:international Conference
Event Dates:03 - 08 Jun 2018
Organizer:Asia Oceania Geosciences Society
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
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: Kappel, David
Deposited On:12 Dec 2018 10:49
Last Modified:12 Dec 2018 10:49

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