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Exposed water ice on the nucleus of comet 67P/Churyumov Gerasimenko

Filacchione, G. and De Sanctis, M.C. and Capaccioni, F. and Raponi, A. and Tosi, F. and Ciarniello, M. and Cerroni, P. and Piccioni, G. and Capria, M. T. and Palomba, E. and Belluci, G. and Erard, S. and Bockelee-Morvan, D. and Leyrat, C. and Arnold, Gabriele and Barucci, M. A. and Fulchignoni, M. and Schmitt, B. and Quirico, E. and Jaumann, R. and Stephan, K. and Longobardo, A and Mennella, V. and Migliorini, A. and Ammannito, E. and Benkhoff, J. and Bibring, Jean-Pierre and Blanco, A. and Blecka, M. and Carlson, R. W. and Carsenty, U. and Colangeli, L. and Combes, M. and Combi, M. and Crovisier, J. and Drossart, P. and Encrenaz, E.T. and Federico, C. and Fink, U. and Fonti, S. and Ip, W-H. and Kührt, E. and Langevin, Y. and Magni, G. and McCord, Thomas B. and Moroz, Liubov and Mottola, S. and Orofino, V. and Schade, U. and Taylor, F.W. and Tiphene, D. and Tozzi, G. and Beck, P. and Biver, N and Bonal, L. and Combe, J. P. and Despan, D. and Flamini, E. and Formisano, M. and Fornasier, S. and Frigeri, A. and Grassi, D. and Gudipati, M. and Kappel, David and Mancarella, F. and Markus, Kathrin and Merlin, F. and Orosei, R. and Rinaldi, G. and Cartacci, M. and Cicchetti, A. and Giuppi, S. and Hello, Y. and Henry, Florence and Jacquinod, S. and Reess, J. M. and Noschese, R. and Politi, R. and Peter, Gisbert (2016) Exposed water ice on the nucleus of comet 67P/Churyumov Gerasimenko. Nature, 529, pp. 368-372. Nature Publishing Group. DOI: 10.1038/nature16190 ISSN 0028-0836

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Official URL: http://www.nature.com/nature/journal/v529/n7586/pdf/nature16190.pdf

Abstract

Although water vapour is the main species observed in the coma of comet 67P/Churyumov Gerasimenko and water is the major constituent of cometary nuclei, limited evidence for exposed water ice regions on the surface of the nucleus has been found so far. The absence of large regions of exposed water ice seems a common finding on the surfaces of many of the comets observed so far. The nucleus of 67P/Churyumov Gerasimenko appears to be fairly uniformly coated with dark, dehydrated, refractory and organic rich material. Here we report the identification at infrared wavelengths of water ice on two debris falls in the Imhotep region of the nucleus. The ice has been exposed on the walls of elevated structures and at the base of the walls. A quantitative derivation of the abundance of ice in these regions indicates the presence of millimetre sized pure water-ice grains, considerably larger than in all previous observations. Although micrometresized water ice grains are the usual result of vapour recondensation in ice free layers, the occurrence of millimetre sized grains of pure ice as observed in the Imhotep debris falls is best explained by grain growth by vapour diffusion in ice rich layers, or by sintering. As a consequence of these processes, the nucleus can develop an extended and complex coating in which the outer dehydrated crust is superimposed on layers enriched in water ice. The stratigraphy observed on 67P/Churyumov Gerasimenko is therefore the result of evolutionary processes affecting the uppermost metres of the nucleus and does not necessarily require a global layering to have occurred at the time of the comet s formation.

Item URL in elib:https://elib.dlr.de/114634/
Document Type:Article
Title:Exposed water ice on the nucleus of comet 67P/Churyumov Gerasimenko
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Filacchione, G.inaf-iasf, rome, italyUNSPECIFIED
De Sanctis, M.C.istituto nazionale di astrofisica, rome, italy.UNSPECIFIED
Capaccioni, F.inaf-iasf, italyUNSPECIFIED
Raponi, A.inaf-iasf, italyUNSPECIFIED
Tosi, F.inaf-iasf istituto di astrofisica spaziale e fisica cosmica, roma italyUNSPECIFIED
Ciarniello, M.inaf-iasf, italyUNSPECIFIED
Cerroni, P.inaf-iasf, rome, italyUNSPECIFIED
Piccioni, G.inaf-iasfUNSPECIFIED
Capria, M. T.instituto di astrofisica spaziale e fisica cosmica, roma, italyUNSPECIFIED
Palomba, E.institute for interplanetary space physics - inaf, rome, italyUNSPECIFIED
Belluci, G.istituto di fisica dello spazio interplanetario inaf-ifsi, via del fosso del cavaliere 100, 00133 roma, 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
Fulchignoni, M.marcello.fulchignoni (at) obspm.frUNSPECIFIED
Schmitt, B.grenoble planetology laboratoryUNSPECIFIED
Quirico, E.laboratory of planetology, cnrs joseph fourier universityUNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Stephan, K.katrin.stephan (at) dlr.deUNSPECIFIED
Longobardo, Ainaf-laps, via del fosso del cavaliere 100, i-00133 rome, italyUNSPECIFIED
Mennella, V.inaf-oac, napoli, italyUNSPECIFIED
Migliorini, A.inaf-iasfUNSPECIFIED
Ammannito, E.inaf, istituto di fisica dello spazio interplanetario, roma, italyUNSPECIFIED
Benkhoff, J.estec, noordwijk, niederlandeUNSPECIFIED
Bibring, Jean-Pierreinstitut d'astrophysique spatialeUNSPECIFIED
Blanco, A.universita degli studi di lecceUNSPECIFIED
Blecka, M.polish academi of sciences, warsaw, polandUNSPECIFIED
Carlson, R. W.jet propulsion laboratoryUNSPECIFIED
Carsenty, U.uri.carsenty (at) dlr.deUNSPECIFIED
Colangeli, L.osservatiori astronomico di capodimonte, italyUNSPECIFIED
Combes, M.observatoire de paris, meudon, franceUNSPECIFIED
Combi, M.space physics research laboratory, the university of michigan, ann arbor, usaUNSPECIFIED
Crovisier, J.observatoire de paris-meudon, franceUNSPECIFIED
Drossart, P.observatoire de paris, meudon, franceUNSPECIFIED
Encrenaz, E.T.lesia observatoire de paris, meudon, franceUNSPECIFIED
Federico, C.università di perugia, italyUNSPECIFIED
Fink, U.lunar planetary laboratory, univarsity of arizona, tucson, usaUNSPECIFIED
Fonti, S.dipartimento di fisica, università di lecce, italyUNSPECIFIED
Ip, W-H.institute for space science, national central university, chung li, taiwanUNSPECIFIED
Kührt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Langevin, Y.institut d’astrophisique spatiale, orsay, franceUNSPECIFIED
Magni, G.inaf/instituto di astrofisica spaziale e fisica cosmica, rome, italyUNSPECIFIED
McCord, Thomas B.bear fight institute, winthrop, wa, united states.UNSPECIFIED
Moroz, LiubovLjuba.Moroz (at) dlr.deUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Orofino, V.universita degli studi di lecceUNSPECIFIED
Schade, U.bessy gmbhUNSPECIFIED
Taylor, F.W.university of oxfordUNSPECIFIED
Tiphene, D.despa, observatoire de paris/meudon, 92195 meudon, franceUNSPECIFIED
Tozzi, G.osservatorio astrofisico di arcetri, firenze, italyUNSPECIFIED
Beck, P.laboratoire de planétologie de grenoble (lpg) - university joseph fourier grenoble, grenboble, franceUNSPECIFIED
Biver, Nobservatoire de parisUNSPECIFIED
Bonal, L.université grenoble alpes, cnrs, institut de planétologie et d’astrophysique de grenoble, grenoble, franceUNSPECIFIED
Combe, J. P.space science inst., winthrop wa, usa, lab. de planetologie et de geodynamique, u. de nantes, nantes, franceUNSPECIFIED
Despan, D.laboratoire d’etudes spatiales et d’instrumentation en astrophysique, observatoire de paris/cnrs/université pierre et marie curie/université paris-diderot, meudon, franceUNSPECIFIED
Flamini, E.asi, agenzia spaziale italiana, viale liegi 26, 00198 rome, italy; lunar and planetary laboratory and steward observatory, university of arizona, tucson, az 85721, usaUNSPECIFIED
Formisano, M.inaf-iasf, italyUNSPECIFIED
Fornasier, S.observatoire de paris-meudon, franceUNSPECIFIED
Frigeri, A.national institute of astrophysics, rome, italyUNSPECIFIED
Grassi, D.inaf-ifsi, rome, italyUNSPECIFIED
Gudipati, M.nasa jet propulsion laboratory, pasadena, ca 91109, usaUNSPECIFIED
Kappel, Daviddavid.kappel (at) dlr.deUNSPECIFIED
Mancarella, F.dipartimento di matematica e fisica "e. de giorgi", università del salento, lecce, italyUNSPECIFIED
Markus, Kathrinwestfälische wilhelms-universität münsterUNSPECIFIED
Merlin, F.lesia-observatoire de parisUNSPECIFIED
Orosei, R.inaf-iasf, rome, italyUNSPECIFIED
Rinaldi, G.istituto di fisica dello spazio interplanetario (ifsi-inaf), rome - italyUNSPECIFIED
Cartacci, M.istituto di astrofisica e planetologia spaziali, istituto nazionale di astrofisica (inaf), rome, italyUNSPECIFIED
Cicchetti, A.istituto di astrofisica e planetologia spaziali, istituto nazionale di astrofisica (inaf), rome, italyUNSPECIFIED
Giuppi, S.ifsiUNSPECIFIED
Hello, Y.despa, observatoire de paris/meudon, 92195 meudon, franceUNSPECIFIED
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
Noschese, R.istituto di astrofisica e planetologia spaziali, istituto nazionale di astrofisica (inaf), rome, italyUNSPECIFIED
Politi, R.istituto di astrofisica e planetologia spaziali, istituto nazionale di astrofisica (inaf), rome, italyUNSPECIFIED
Peter, Gisbertgisbert.peter (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Nature
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:529
DOI :10.1038/nature16190
Page Range:pp. 368-372
Publisher:Nature Publishing Group
ISSN:0028-0836
Status:Published
Keywords:Rosetta; comet 67P; water ice; VIRTIS
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
Institute of Planetary Research > Leitungsbereich PF
Institute of Planetary Research > Planetary Geology
Institute of Optical Sensor Systems > Space Instruments
Deposited By: Schubert, Renate
Deposited On:10 Nov 2017 12:37
Last Modified:08 Mar 2018 18:47

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