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Surface Morphology of Comets and Associated Evolutionary Processes: A Review of Rosetta's Observations of 67P/Churyumov-Gerasimenko

El-Maarry, Mohamed Ramy and Groussin, O and Keller, H. U. and Thomas, N. and Vincent, Jean-Baptiste and Mottola, Stefano and Pajola, M. and Otto, Katharina A. and Henry, Clemence and Krasilnikov, S.S. (2019) Surface Morphology of Comets and Associated Evolutionary Processes: A Review of Rosetta's Observations of 67P/Churyumov-Gerasimenko. Space Science Reviews, 215 (36), pp. 1-33. Springer. DOI: 10.1007/s11214-019-0602-1 ISSN 0038-6308

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Official URL: https://link.springer.com/article/10.1007%2Fs11214-019-0602-1

Abstract

Comets can be regarded as active planetary bodies because they display evidence for nearly all fundamental geological processes, which include impact cratering, tectonism, and erosion. Comets also display sublimation-driven outgassing, which is comparable to volcanism on larger planetary bodies in that it provides a conduit for delivering materials from the interior to the surface. However, in the domain of active geological bodies, comets occupy a special niche since their geologic activity is almost exclusively driven by externally supplied energy (i.e. solar energy) as opposed to an internal heat source, which makes them “seasonally-active” geological bodies. During their active phase approaching the Sun, comets also develop a transient atmosphere that interacts with the surface and contributes to its evolution, particularly by transporting materials across the surface. Variations in solar energy input on diurnal and seasonal scale cause buildup of thermal stresses within consolidated materials that lead to weathering through fracturing, and eventually mass-wasting. The commonly irregular shapes of comets also play a major role in their evolution by leading to (1) non-uniform gravitational forces that affect material movement across the surface, and (2) spatially heterogeneous outgassing patterns that affect the comet’s orbital dynamics and lead to tidal stresses that can further fracture the nucleus. In this chapter, we review the surface morphology of comet 67P/Churyumov–Gerasimenko as well as its seasonal evolution as viewed by Rosetta from August 2014 to September 2016, their link to various processes, and the forces that drive surface evolution.

Item URL in elib:https://elib.dlr.de/131935/
Document Type:Article
Title:Surface Morphology of Comets and Associated Evolutionary Processes: A Review of Rosetta's Observations of 67P/Churyumov-Gerasimenko
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
El-Maarry, Mohamed RamyBirkbeck College, University of London, WC1E 7HX, London, UKUNSPECIFIED
Groussin, OLaboratoire d'Astrophysique de Marseille, FranceUNSPECIFIED
Keller, H. U.horst.keller (at) dlr.deUNSPECIFIED
Thomas, N.Physikalisches Institut, Sidlerstrasse 5, University of Bern, 3012 Bern, SwitzerlandUNSPECIFIED
Vincent, Jean-BaptisteJean-Baptiste.Vincent (at) dlr.deUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Pajola, M.INAF Astronomical observatory of Padova, Vicolo dell’Osservatorio 5, 35122 Padova, ItalyUNSPECIFIED
Otto, Katharina A.Katharina.Otto (at) dlr.dehttps://orcid.org/0000-0002-0675-1177
Henry, ClemencePhysikalisches Institut, Sidlerstrasse 5, University of Bern, 3012 Bern, SwitzerlandUNSPECIFIED
Krasilnikov, S.S.Vernadsky Institute of Geochemistry and Analytical Chemistry, RAS, Moscow, RussiaUNSPECIFIED
Date:2019
Journal or Publication Title:Space Science Reviews
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:215
DOI :10.1007/s11214-019-0602-1
Page Range:pp. 1-33
Publisher:Springer
ISSN:0038-6308
Status:Published
Keywords:Comet 67P, Geomorphology, Evolution of Comets, Rosetta
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
Deposited By: Otto, Dr. Katharina A.
Deposited On:04 Dec 2019 12:54
Last Modified:04 Dec 2019 12:54

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