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The global surface composition of 67P/Churyumov-Gerasimenko nucleus by Rosetta/VIRTIS. II) Diurnal and seasonal variability

Ciarniello, M. and Raponi, A. and Capaccioni, F. and Filacchione, G. and Tosi, F. and Desanctis, M.C. and Kappel, David and Rousseau, Batiste and Arnold, Gabriele and Capria, M. T. and Barucci, M. A. and Quirico, E. and Longobardo, A and Kuehrt, E. and Mottola, S. and Erard, S. and Bockelee-Morvan, D. and Leyrat, C. and Migliorini, A. and Zinzi, A. and Palomba, E. and Schmitt, B. and Piccioni, G. and Cerroni, P. and Ip, W-H. and Rinaldi, G. and Salatti, M. (2016) The global surface composition of 67P/Churyumov-Gerasimenko nucleus by Rosetta/VIRTIS. II) Diurnal and seasonal variability. Monthly Notices of the Royal Astronomical Society, 462, S443-S458. Oxford University Press. DOI: 10.1093/mnras/stw3177 ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1093/mnras/stw3177

Abstract

VIRTIS-M observations of the nucleus of comet 67P/Churyumov–Gerasimenko acquired from 2014 August to 2015 May have been analysed to investigate surface temporal variability at both seasonal and diurnal scales. The measured reflectance spectra are studied by means of comet spectral indicators (CSI) such as slopes in the visible and infrared ranges, and 3.2 μm band area and band centre. CSI maps derived from data acquired at different heliocentric distances (from 3.62 to 1.72 au) along the inbound leg of the comet's orbit are used to infer surface water ice abundance. We measure a global scale enrichment of water ice from 2014 August to 2015 May across the body of the comet, along with variability at small spatial scale, possibly related with the local insolation conditions. Analysis of water ice diurnal variability is performed on 2014 August observations. Water ice appears at the border of receding shadows in the neck of the comet (Hapi), sublimating in less than 1 h, after exposure to sunlight. As similar variability is not observed in other regions of the comet, we interpreted this as the expression of a diurnal cycle of sublimation and re-condensation of water ice, triggered by sudden shadowing produced on the neck by the body and the head of the nucleus.

Item URL in elib:https://elib.dlr.de/115307/
Document Type:Article
Title:The global surface composition of 67P/Churyumov-Gerasimenko nucleus by Rosetta/VIRTIS. II) Diurnal and seasonal variability
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ciarniello, M.inaf-iasf, italyUNSPECIFIED
Raponi, A.inaf-iasf, italyUNSPECIFIED
Capaccioni, F.inaf-iasf, italyUNSPECIFIED
Filacchione, G.inaf-iasf, rome, italyUNSPECIFIED
Tosi, F.inaf-iasf istituto di astrofisica spaziale e fisica cosmica, roma italyUNSPECIFIED
Desanctis, M.C.inaf, istituto di astrofisica spaziale e fisica cosmica, roma, italyUNSPECIFIED
Kappel, Daviddavid.kappel (at) dlr.deUNSPECIFIED
Rousseau, BatistelesiaUNSPECIFIED
Arnold, Gabrielegabriele.arnold (at) dlr.deUNSPECIFIED
Capria, M. T.instituto di astrofisica spaziale e fisica cosmica, roma, italyUNSPECIFIED
Barucci, M. A.observatoire de paris, meudon, franceUNSPECIFIED
Quirico, E.laboratory of planetology, cnrs joseph fourier universityUNSPECIFIED
Longobardo, Ainaf-laps, via del fosso del cavaliere 100, i-00133 rome, italyUNSPECIFIED
Kuehrt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Erard, S.lesiaUNSPECIFIED
Bockelee-Morvan, D.observatoire de paris, meudonUNSPECIFIED
Leyrat, C.lesiaUNSPECIFIED
Migliorini, A.inaf-iasfUNSPECIFIED
Zinzi, A.institute for interplanetary space physics - inaf, rome, italyUNSPECIFIED
Palomba, E.institute for interplanetary space physics - inaf, rome, italyUNSPECIFIED
Schmitt, B.grenoble planetology laboratoryUNSPECIFIED
Piccioni, G.inaf-iasfUNSPECIFIED
Cerroni, P.inaf-iasf, rome, italyUNSPECIFIED
Ip, W-H.institute for space science, national central university, chung li, taiwanUNSPECIFIED
Rinaldi, G.istituto di fisica dello spazio interplanetario (ifsi-inaf), rome - italyUNSPECIFIED
Salatti, M.asi romUNSPECIFIED
Date:November 2016
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:462
DOI :10.1093/mnras/stw3177
Page Range:S443-S458
Publisher:Oxford University Press
Series Name:Monthly Notices of the Royal Astronomical Society
ISSN:0035-8711
Status:Published
Keywords:radiative transfer, imaging spectroscopy, comets, 67P/Churyumov-Gerasimenko
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 > Asteroids and Comets
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Kappel, David
Deposited On:21 Nov 2017 11:32
Last Modified:06 Sep 2019 15:17

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