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OSIRIS observations of metre-sized exposures of H2O ice at the surface of 67P/Churyumov-Gerasimenko and interpretation using laboratory experiments

Pommerol, A. and Thomas, N. and El-Maarry, M. R. and Pajola, M. and Groussin, O. and Auger, A.-T. and Oklay, N. and Fornasier, S. and Feller, C. and Davidsson, B. and Gracia-Berná, A. and Jost, B. and Marschall, R. and Poch, O. and Barucci, M. A. and Bertaux, J. -L. and La Forgia, F. and Keller, H. U. and Kuehrt, E. and Lowry, S. C. and Mottola, S. and Naletto, G. and Sierks, H. and Barbieri, C. and Lamy, P. L. and Rodrigo, R. and Rickman, H. and Koschny, D. and Agarwal, J. and A’Hearn, M. F. and Bertini, I. and Cremonese, G. and Da Deppo, V. and De Cecco, M. and Debei, S. and Güttler, C. and Fulle, M. and Gutierrez, P. J. and Hviid, S. F. and Ip, W. -H. and Jorda, L. and Knollenberg, J. and Kovacs, G. and Kramm, J. -R. and Küppers, E. and Lara, L. M. and Lazzarin, M. and Lopez Moreno, J. L. and Marzari, F. and Michalik, H. and Preusker, Frank and Scholten, F. and Tubiana, C. and Vincent, J.-B. (2015) OSIRIS observations of metre-sized exposures of H2O ice at the surface of 67P/Churyumov-Gerasimenko and interpretation using laboratory experiments. Astronomy and Astrophysics, 583 (A25), pp. 1-16. EDP Sciences. DOI: 10.105/0004-6361/201525977 ISSN 0004-6361

Full text not available from this repository.

Abstract

Since OSIRIS started acquiring high-resolution observations of the surface of comet 67P/Churyumov-Gerasimenko’s nucleus, over one hundred metre-sized bright spots have been identified, in numerous types of geomorphologic regions but mostly located in areas receiving low insolation. The bright spots are either clustered, in debris fields close to decametre-high cliffs or isolated without structural relation to the surrounding terrain. They can be up to ten times brighter than the average surface of the comet at visible wavelengths and display a significantly bluer spectrum. They do not exhibit significant changes over a period of a few weeks. All these observations are consistent with exposure of water ice at the surface of boulders produced by dislocation of the weakly consolidated layers that cover large areas of the nucleus. Laboratory experiments show that under simulated comet surface conditions, analog samples acquire a vertical stratification with an uppermost porous mantle of refractory dust overlaying a layer of hard ice formed by re-condensation/sintering under the insulating dust mantle. The evolution of the visible spectrophotometric properties of samples during sublimation is consistent with the contrasts of brightness and colour seen at the surface of the nucleus. Clustered bright spots are formed by the collapse of overhangs triggered by mass wasting of deeper layers. Isolated spots are possibly the result of the emission of boulders at low velocity and re-deposition in other regions.

Item URL in elib:https://elib.dlr.de/97566/
Document Type:Article
Title:OSIRIS observations of metre-sized exposures of H2O ice at the surface of 67P/Churyumov-Gerasimenko and interpretation using laboratory experiments
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pommerol, A.Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, e-mail: antoine.pommerol (at) space.unibe.chUNSPECIFIED
Thomas, N.University of Bern, SwitzerlandUNSPECIFIED
El-Maarry, M. R.Physikalisches Institut, Sidlerstrasse 5, University of Bern, CH-3012 Bern, SwitzerlandUNSPECIFIED
Pajola, M.CISAS - Center for Studies and Activities for Space, University of PadovaUNSPECIFIED
Groussin, O.Laboratoire d'Astrophysique de Marseille, FranceUNSPECIFIED
Auger, A.-T.Lab. d'Astrophysique de Marseille, FranceUNSPECIFIED
Oklay, N.Max-Planck-Institut für SonnensystemforschungUNSPECIFIED
Fornasier, S.Observatoire de Paris-Meudon, FranceUNSPECIFIED
Feller, C.LESIA, Observatoire de Paris, CNRS, UPMC Univ Paris 06, Univ. Paris-Diderot, 5 Place J. Janssen, 92195 Meudon Pricipal Cedex, FranceUNSPECIFIED
Davidsson, B.Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, SwedenUNSPECIFIED
Gracia-Berná, A.Physikalisches Institut, Sidlerstrasse 5, University of Bern, CH-3012 Bern, SwitzerlandUNSPECIFIED
Jost, B.University of Bern, SwitzerlandUNSPECIFIED
Marschall, R.Physikalisches Institut, Sidlerstrasse 5, University of Bern, CH-3012 Bern, SwitzerlandUNSPECIFIED
Poch, O.Physikalisches Institut, Universität Bern, Sidlerstrasse 5, 3012 Bern,UNSPECIFIED
Barucci, M. A.Observatoire de Paris, Meudon, FranceUNSPECIFIED
Bertaux, J. -L.UNSPECIFIEDUNSPECIFIED
La Forgia, F.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Keller, H. U.Technical University of BraunschweigUNSPECIFIED
Kuehrt, E.ekkehard.kuehrt (at) dlr.deUNSPECIFIED
Lowry, S. C.Queen's University, Belfast, UKUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Naletto, G.Università di Padova, Departimento di Elettronica et Informatica, Padova, ItalyUNSPECIFIED
Sierks, H.Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, GermanyUNSPECIFIED
Barbieri, C.University of Padova, Padova, ItalyUNSPECIFIED
Lamy, P. L.Aix-Marseille Universite, CNRS, LAMUNSPECIFIED
Rodrigo, R.Instituto de Astrofísica de Andalucía – CSIC, Granada, SpainUNSPECIFIED
Rickman, H.Department of Physics and Astronomy, Uppsala University, 75120 Uppsala, SwedenUNSPECIFIED
Koschny, D.Detlef.Koschny (at) esa.intUNSPECIFIED
Agarwal, J.Max-Planck-Institut für SonnensystemforschungUNSPECIFIED
A’Hearn, M. F.Department for Astronomy, University of MarylandUNSPECIFIED
Bertini, I.Dipartimento di Astronomia, Università di Padova, Padova, ItalyUNSPECIFIED
Cremonese, G.Osservatorio Astronomico, Padova, ItalyUNSPECIFIED
Da Deppo, V.Consiglio Nazionale delle Ricerche-Istituto Nazionale per la Fisica della Materia, Luxor, Padova, ItalyUNSPECIFIED
De Cecco, M.Università di Padova, Center of Studies and Activities of Space (CISAS) "G.Colombo", Padova, ItalyUNSPECIFIED
Debei, S.Università di Padova, Center of Studies and Activities of Space (CISAS) "G.Colombo", Padova, ItalyUNSPECIFIED
Güttler, C.Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, GermanyUNSPECIFIED
Fulle, M.INAF - Osservatorio Astronomico di Trieste, Trieste, ItalyUNSPECIFIED
Gutierrez, P. J.Instituto de Astrofísica de Andalucía – CSIC, Granada, SpainUNSPECIFIED
Hviid, S. F.stubbe.hviid (at) dlr.deUNSPECIFIED
Ip, W. -H.National Central University, Graduate Institute of Astronomy,UNSPECIFIED
Jorda, L.Laboratoire d'Astrophysique de Marseille, FranceUNSPECIFIED
Knollenberg, J.joerg.knollenberg (at) dlr.deUNSPECIFIED
Kovacs, G.Max–Planck–Institut für Sonnensystemforschung, Justus–von–UNSPECIFIED
Kramm, J. -R.Max-Planck-Institut für Sonnensystemforschung, Justus-von-UNSPECIFIED
Küppers, E.Operations Department, European Space Astronomy Centre/ESA,UNSPECIFIED
Lara, L. M.Instituto de Astrofisica de Andalucia, CSIC, Granada, SpainUNSPECIFIED
Lazzarin, M.Department of Astronomy, University of PaduaUNSPECIFIED
Lopez Moreno, J. L.Instituto de Astrofísica de Andalucía (CSIC), c/ Glorieta de laUNSPECIFIED
Marzari, F.Università di Padova, Departimento di Fisica, Padova, ItalyUNSPECIFIED
Michalik, H.Institut für Datentechnik und Kommunikationsnetze (IDA), Technische Universität Braunschweig, Hans-Sommer-Str. 66, 38106 Braunschweig, GermanyUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Scholten, F.frank.scholten (at) dlr.deUNSPECIFIED
Tubiana, C.Max-Planck-Institut fuer Sonnensystemforschung, GermanyUNSPECIFIED
Vincent, J.-B.Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, GermanyUNSPECIFIED
Date:2015
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:583
DOI :10.105/0004-6361/201525977
Page Range:pp. 1-16
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:comets: general – techniques: image processing – methods: laboratory: solid state
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 > Planetary Geodesy
Deposited By: Bründl, Tara-Marie
Deposited On:10 Dec 2015 08:00
Last Modified:01 Dec 2018 19:51

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