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The Rocky‐Like Behavior of Cometary Landslides on 67P/Churyumov‐Gerasimenko

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dc.contributor.authorLucchetti, A.
dc.contributor.authorPenasa, L.
dc.contributor.authorPajola, M.
dc.contributor.authorMassironi, M.
dc.contributor.authorTeresa Brunetti, M.
dc.contributor.authorCremonese, G.
dc.contributor.authorOklay, N.
dc.contributor.authorVicent, J. B.
dc.contributor.authorMottola, S.
dc.contributor.authorFornasier, S.
dc.contributor.authorSierks, H.
dc.contributor.authorNaletto, G.
dc.contributor.authorLamy, Philippe
dc.contributor.authorRodrigo, Rafael
dc.contributor.authorKoschny, D.
dc.contributor.authorDavidsson, B. J. R.
dc.contributor.authorBarbieri, C.
dc.contributor.authorAntonietta Barucci, M.
dc.contributor.authorBertaux, J. L.
dc.contributor.authorBertini, I.
dc.contributor.authorBodewits, D.
dc.contributor.authorCambianica, P.
dc.contributor.authorDa Deppo, V.
dc.contributor.authorDebei, S.
dc.contributor.authorDe Cecco, M.
dc.contributor.authorDeller, J.
dc.contributor.authorFerrari, S.
dc.contributor.authorFerri, F.
dc.contributor.authorFranceschi, M.
dc.contributor.authorFulle, M.
dc.contributor.authorGutiérrez, Pedro J.
dc.contributor.authorGüttler, C.
dc.contributor.authorIp, W. H.
dc.contributor.authorKeller, H. U.
dc.contributor.authorLara, L.
dc.contributor.authorLazzarin, M.
dc.contributor.authorLópez Moreno, J. J.
dc.contributor.authorMarzari, F.
dc.contributor.authorTubiana, C.
dc.contributor.orcidLucchetti, A. [0000-0001-7413-3058]
dc.contributor.orcidFerrari, S. [0000-0002-0157-3463]
dc.contributor.orcidLara, L. [0000-0002-7184-920X]
dc.contributor.orcidFranceschi, M. [0000-0002-2061-0151]
dc.contributor.orcidDebei, S. [0000-0002-6757-6616]
dc.contributor.orcidFulle, M. [0000-0001-8435-5287]
dc.contributor.orcidLópez Moreno, J. J. [0000-0002-7946-2624]
dc.contributor.orcidPenasa, L. [0000-0002-6394-3108]
dc.contributor.orcidPajola, M. [0000-0002-3144-1277]
dc.contributor.orcidFerri, F. [0000-0003-2395-5275]
dc.contributor.orcidBertini, I. [0000-0002-0616-2444]
dc.contributor.otherUnidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737
dc.date.accessioned2021-04-13T13:52:58Z
dc.date.available2021-04-13T13:52:58Z
dc.date.issued2019-12-18
dc.descriptionComet 67P Churyumov‐Gerasimenko has been imaged with unprecedented spatial detail thanks to the high‐resolution OSIRIS camera (Optical, Spectroscopic and Infrared Remote Imaging System) on board the Rosetta spacecraft. 67P is characterized by an extremely diverse morphology comprising different surface features such as rough consolidated terrains, smooth plains, unconsolidated mantles, pits, fractures, cliffs, cuestas, ubiquitous boulders, and layers. The peculiarity of 67P is also reflected by the widespread presence of landslides. By using high‐resolution images, we analyze the shape and aspect ratio of the landslides located on comet 67P finding a mechanical behavior of the cometary material that is more akin to Earth dry landslides than to icy satellites' mass movements. These results make 67P a very peculiar object, mainly composed by ices and refractory materials but characterized by rocky‐type properties rather than icy‐type characteristics. In addition, the considerable variability among the different landslides of 67P suggests that different volatile contents located in the top few meters of the cometary crust play a fundamental role on mass movement, hence being a general indicator for the subsurface cometary heterogeneities.es
dc.description.abstractLandslides have been identified on several solar system bodies, and different mechanisms have been proposed to explain their runout length. We analyze images from the Rosetta mission and report the global characterization of such features on comet 67P/Churyumov‐Gerasimenko's surface. By assuming the height to runout length as an approximation for the friction coefficient of landslide material, we find that on comet 67P, this ratio falls between 0.50 and 0.97. Such unexpected high values reveal a rocky‐type mechanical behavior that is much more akin to Earth dry landslides than to icy satellites' mass movements. This behavior indicates that 67P and likely comets in general are characterized by consolidated materials possibly rejecting the idea that they are fluffy aggregates. The variability of the runout length among 67P landslides can be attributed to the different volatile content located in the top few meters of the cometary crust, which can drive the mass movement.es
dc.description.peerreviewedPeer reviewes
dc.description.sponsorshipOSIRIS was built by a consortium of the Max-Planck-Institut fur Sonnensystemforschung, in Gottingen, Germany, CISAS-University of Padova, Italy, the Laboratoire d'Astrophysique de Marseille, France, the Instituto de Astrofisica de Andalucia, CSIC, Granada, Spain, the Research and Scientific Support Department of the European Space Agency, Noordwijk, The Netherlands, the Instituto Nacional de Tecnica Aeroespacial, Madrid, Spain, the Universidad Politechnica de Madrid, Spain, the Department of Physics and Astronomy of Uppsala University, Sweden, and the Institut fur Datentechnik und Kommunikationsnetze der Technischen Universitat Braunschweig, Germany. The support of the national funding agencies of Germany (DLR), Italy (ASI), France (CNES), Spain (MEC), Sweden (SNSB), and the ESA Technical Directorate is gratefully acknowledged. We thank the ESA teams at ESAC, ESOC, and ESTEC for their work in support of the Rosetta mission. We made use of ArcMap 10.3.1 and Matlab software to perform our analysis. All the images analyzed during the current study and the 3-D 67P shape model are available in the ESA-PSA repository (https://archives.esac.esa.int/psa).The data archiving that support the findings of this study are on the following Zenodo repository, doi: 10.5281/zenodo.3516279; With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737).es
dc.identifier.citationGeophysical Research Letters 46(24): 14336-14346(2020)es
dc.identifier.doi10.1029/2019GL085132
dc.identifier.e-issn1944-8007
dc.identifier.issn0094-8276
dc.identifier.otherhttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019GL085132
dc.identifier.urihttp://hdl.handle.net/20.500.12666/315
dc.language.isoenges
dc.publisherAmerican Geophysical Union: Advancing Earth and Space Sciencees
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internationales
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.license©2019. American Geophysical Union. All Rights Reserved.
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectComet 67Pes
dc.subjectLandslideses
dc.subjectComet surfacees
dc.titleThe Rocky‐Like Behavior of Cometary Landslides on 67P/Churyumov‐Gerasimenkoes
dc.typeinfo:eu-repo/semantics/articlees
dc.type.coarhttp://purl.org/coar/resource_type/c_6501
dc.type.hasVersioninfo:eu-repo/semantics/publishedVersion
dspace.entity.typePublication

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