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Thermophysics of fractures on comet 67P/Churyumov-Gerasimenko

Höfner, S. and Vincent, J.-B. and Blum, J. and Davidsson, B. J. R. and Sierks, H. and El-Maarry, M. R. and Deller, J. and Hofmann, M. and Hu, X. and Pajola, M. and Barbieri, C. and Lamy, P. L. and Rodrigo, R. and Koschny, Detlef and Rickmann, H. and Keller, H. U. and A’Hearn, M. F. and Auger, A.-T. and Barucci, M. A. and Bertaux, J.-L. and Bertini, I. and Bodewits, D. and Cremonese, G. and Da Deppo, V. and Debei, S. and De Cecco, M. and Fornasier, S. and Fulle, M. and Gicquel, A. and Groussin, O. and Gutierrez, P. J. and Gutierrez-Marques, P. and Güttler, C. and Hviid, S. and IP, W.-H. and Jorda, L. and Knollenberg, J. and Kovacs, G. and Kramm, J.-R. and Kührt, E. and Küppers, M. and La Forgia, F. and Lazzarin, M. and Lopez-Moreno, J. J. and Marzari, F. and Michalik, H. and Moissl-Fraund, R. and Moreno, F. and Mottola, S. and Naletto, G. and Oklay, N. and Preusker, F. and Scholten, F. and Shi, X. and Thomas, N. and Toth, I. and Tubiana, C. and Zitzmann, S. (2017) Thermophysics of fractures on comet 67P/Churyumov-Gerasimenko. Astronomy & Astrophysics, 608, A121. EDP Sciences. DOI: 10.1051/0004-6361/201628726 ISSN 0004-6361

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Official URL: https://www.aanda.org/articles/aa/abs/2017/12/aa28726-16/aa28726-16.html

Abstract

Context. The camera OSIRIS on board Rosetta obtained high-resolution images of the nucleus of comet 67P/Churyumov-Gerasimenko (67P). Great parts of the nucleus surface are composed of fractured terrain. Aims. Fracture formation, evolution, and their potential relationship to physical processes that drive activity are not yet fully understood. Observed temperatures and gas production rates can be explained or interpreted with the presence of fractures by applying appropriate modelling methods. Methods. We followed a transient thermophysical model approach that includes radiative, conductive, and water-ice sublimation fluxes by considering a variety of heliocentric distances, illumination conditions, and thermophysical properties for a set of characteristic fracture geometries on the nucleus of 67P. We computed diurnal temperatures, heat fluxes, and outgassing behaviour in order to derive and distinguish the influence of the mentioned parameters on fractured terrain. Results. Our analysis confirms that fractures, as already indicated by former studies about concavities, deviate from flat-terrain topographies with equivalent properties, mostly through the effect of self-heating. Compared to flat terrain, illuminated cometary fractures are generally warmer, with smaller diurnal temperature fluctuations. Maximum sublimation rates reach higher peaks, and dust mantle quenching effects on sublimation rates are weaker. Consequently, the rough structure of the fractured terrain leads to significantly higher inferred surface thermal inertia values than for flat areas with identical physical properties, which might explain the range of measured thermal inertia on 67P. Conclusions. At 3.5 AU heliocentric distance, sublimation heat sinks in fractures converge to maximum values >50 W / m2 and trigger dust activity that can be related mainly to H2O. Fractures are likely to grow through the erosive interplay of alternating sublimation and thermal fatigue.

Item URL in elib:https://elib.dlr.de/124694/
Document Type:Article
Title:Thermophysics of fractures on comet 67P/Churyumov-Gerasimenko
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Höfner, S.Max-Planck-Institut für Sonnensystemforschung, Göttingen, GermanyUNSPECIFIED
Vincent, J.-B.jean-baptiste.vincent (at) dlr.deUNSPECIFIED
Blum, J.Institut für Geophysik und extraterrestrische Physik (IGEP), Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, GermanyUNSPECIFIED
Davidsson, B. J. R.jpl, PasadenaUNSPECIFIED
Sierks, H.Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, GermanyUNSPECIFIED
El-Maarry, M. R.Physikalisches Institut, Sidlerstrasse 5, University of Bern, CH-3012 Bern, SwitzerlandUNSPECIFIED
Deller, J.Max-Planck Institut für Sonnensystemforschung, Goettingen, GermanyUNSPECIFIED
Hofmann, M.Max-Planck-Institut für Sonnensystemforschung, Göttingen, GermanyUNSPECIFIED
Hu, X.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Pajola, M.CISAS - Center for Studies and Activities for Space, University of PadovaUNSPECIFIED
Barbieri, C.University of Padova, Padova, ItalyUNSPECIFIED
Lamy, P. L.Laboratoire d’Astrophysique de Marseille, UMR 7326, CNRS & Aix-Marseille Université, 13388 Marseille, FranceUNSPECIFIED
Rodrigo, R.International Space Science Institute, Hallerstraße 6, 3012 Bern, SwitzerlandUNSPECIFIED
Koschny, DetlefESTEC, The NetherlandsUNSPECIFIED
Rickmann, H.PAS Space Research Center, Bartycka , PolandUNSPECIFIED
Keller, H. U.horst.keller (at) dlr.deUNSPECIFIED
A’Hearn, M. F.Department for Astronomy, University of Maryland, College Park, MD 20742-2421, USAUNSPECIFIED
Auger, A.-T.Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388, Marseille, France, email: anne_therese.auger (at) lam.frUNSPECIFIED
Barucci, M. A.LESIA, Obs. de Paris, CNRS, Univ Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195 Meudon, FranceUNSPECIFIED
Bertaux, J.-L.Laboratoire Atmosphères, Milieux, Observations Spatiales, CNRS/UVSQ/UPMC, 11 boulevard d’Alembert, 78280 Guyancourt, FranceUNSPECIFIED
Bertini, I.Dipartimento di Astronomia, Università di Padova, Padova, ItalyUNSPECIFIED
Bodewits, D.Department for Astronomy, University of Maryland, College Park, MD 20742-2421, USAUNSPECIFIED
Cremonese, G.Osservatorio Astronomico, Padova, ItalyUNSPECIFIED
Da Deppo, V.Consiglio Nazionale delle Ricerche-Istituto Nazionale per la Fisica della Materia, Luxor, Padova, ItalyUNSPECIFIED
Debei, S.Università di Padova, Center of Studies and Activities of Space (CISAS) "G.Colombo", Padova, ItalyUNSPECIFIED
De Cecco, M.Università di Padova, Center of Studies and Activities of Space (CISAS) "G.Colombo", Padova, ItalyUNSPECIFIED
Fornasier, S.LESIA, Obs. de Paris, CNRS, Univ Paris 06, Univ. Paris-Diderot, 5 place J. Janssen, 92195 Meudon, FranceUNSPECIFIED
Fulle, M.INAF – Osservatorio Astronomico di Trieste, via Tiepolo 11, 34143 Trieste, ItalyUNSPECIFIED
Gicquel, A.LESIAUNSPECIFIED
Groussin, O.Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille) UMR 7326, 13388, Marseille, France, e-mail: olivier.groussin (at) lam.frUNSPECIFIED
Gutierrez, P. J.Instituto de Astrofísica de Andalucía – CSIC, Granada, SpainUNSPECIFIED
Gutierrez-Marques, P.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Güttler, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Hviid, S.stubbe.hviid (at) dlr.deUNSPECIFIED
IP, W.-H.Nationa Central Univ., Institute of Astronomy, Chung-Li, TaiwanUNSPECIFIED
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
Kührt, E.Institute of Planetary Research, DLR, Rutherfordstrasse 2, 12489, Berlin, GermanyUNSPECIFIED
Küppers, M.ESA/ESAC, PO Box 78, 28691 Villanueva de la Cañada, SpainUNSPECIFIED
La Forgia, F.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Lazzarin, M.Department of Astronomy, University of PaduaUNSPECIFIED
Lopez-Moreno, J. J.Instituto de Astrofisica de Andalucia CSIC, Glorieta de la Astronomia, 18008, Granada, SpainUNSPECIFIED
Marzari, F.Department of Physics and Astronomy "G. Galilei", University of Padova, Vic. Osservatorio 3, 35122 Padova, ItalyUNSPECIFIED
Michalik, H.Institut für Datentechnik und Kommunikationsnetze (IDA), Technische Universität Braunschweig, Hans-Sommer-Str. 66, 38106 Braunschweig, GermanyUNSPECIFIED
Moissl-Fraund, R.Operations Department, European Space Astronomy Centre/ESA, PO Box 78, 28691 Villanueva de la Canada, Madrid, SpainUNSPECIFIED
Moreno, F.Instituto de Astrofísica de Andalucía, Consejo Superior de Investigaciones Científicas (CSIC), P.O. Box 3008, 18080 Granada, SpainUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Naletto, G.Università di Padova, Departimento di Elettronica et Informatica, Padova, ItalyUNSPECIFIED
Oklay, N.nilda.oklayvincent (at) dlr.deUNSPECIFIED
Preusker, F.Frank.Preusker (at) dlr.deUNSPECIFIED
Scholten, F.frank.scholten (at) dlr.deUNSPECIFIED
Shi, X.Max-Planck-Institut für Sonnensystemforschung, Justus-von- Liebig-Weg, 3 37077 Göttingen, GermanyUNSPECIFIED
Thomas, N.Physikalisches Institut, Sidlerstrasse 5, University of Bern, CH-3012 Bern, SwitzerlandUNSPECIFIED
Toth, I.Konkoly Observatory, MTA CSFK CSIUNSPECIFIED
Tubiana, C.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Zitzmann, S.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, GermanyUNSPECIFIED
Date:13 December 2017
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:608
DOI :10.1051/0004-6361/201628726
Page Range:A121
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:Rosetta 67P Comets Thermal Fractures
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: Hviid, Stubbe
Deposited On:10 Dec 2018 14:15
Last Modified:31 Jul 2019 20:22

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