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Experimental simulation of geomorphological evolution of cometary surfaces using volatile-rich analog materials

Haack, David and Otto, Katharina A. and Kührt, Ekkehard and Gundlach, B. and Kreuzig, Christopher and Blum, J. and Jaumann, R (2019) Experimental simulation of geomorphological evolution of cometary surfaces using volatile-rich analog materials. EGU General Assembly 2019, Vienna, Austria.

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Abstract

The morphologic development of sublimating cometary surfaces is investigated in our study using analog laboratory experiments on Earth. The focus lies on the evolution of different morphologies, taking into account parameters such as the composition of the sample material and variable insolation flux. Different sample compositions and geometries are prepared to model the interaction of volatile-dust mixtures with vacuum conditions. We aim to study the appearance of morphologic features, such as fractures and debris, developing by insolation and sublimation. Important questions to answer are: • Under which insolation and compositional conditions do cracks form in the sample material? • Under which insolation and compositional conditions do cliffs collapse and are larger debris particles formed? • Under given environmental conditions, how long do morphologic features remain on the surface? • How do sublimating volatiles support the process of dust transport? • What are the time scales of activity under given environmental conditions? Initial investigations were conducted using cometary analogue materials. These materials are mixtures of water-ice and silica-dust particles with a diameter of few microns and in different mixing ratios. The water-ice particles are produced by freezing mist with liquid nitrogen and the silica-dust consists of angular particles of comparable size. To determine the tensile strength of the different ice-dust mixtures a series of Brazilian Disc Tests was performed. In this test, small cylinders of sample material are exposed to pressure until fracturing. The derived tensile strength can be used to determine the cohesion of the ice-dust mixtures and allows the vapour pressure that is required to entrain particles by sublimating volatiles to be estimated. In our upcoming experiments, sample mixtures of variable particle sizes and water-ice/silica-dust ratios will be shaped into various morphologies, such as a cliff, pits or boulders and placed into a vacuum sublimation chamber. During insolation, the water-ice sublimates and the altering sample morphology will be observed and analysed with cameras. Additional monitored processes will be: • mass loss during different phases of varying insolation • lateral extent of mass movements • the evolution of the temperature inside the sample material.

Item URL in elib:https://elib.dlr.de/132147/
Document Type:Conference or Workshop Item (Poster)
Title:Experimental simulation of geomorphological evolution of cometary surfaces using volatile-rich analog materials
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haack, Daviddavid.haack (at) dlr.deUNSPECIFIED
Otto, Katharina A.Katharina.Otto (at) dlr.dehttps://orcid.org/0000-0002-0675-1177
Kührt, EkkehardEkkehard.Kuehrt (at) dlr.deUNSPECIFIED
Gundlach, B.institut für geophysik und extraterrestrische physik (igep), technische universität braunschweig, mendelssohnstr. 3, 38106 braunschweig, germanyUNSPECIFIED
Kreuzig, ChristopherInstitut fur Geophysik und Extraterrestrische Physik, Technische Universität Braunschweig,Braunschweig, GermanyUNSPECIFIED
Blum, J.institut für geophysik und extraterrestrische physik (igep), technische universität braunschweig, mendelssohnstr. 3, 38106 braunschweig, germanyUNSPECIFIED
Jaumann, Rralf.jaumann (at) dlr.deUNSPECIFIED
Date:2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:21
Page Range:p. 2397
Series Name:Geophysical Research Abstracts
Status:Published
Keywords:cometary morphology, experimental sublimation
Event Title:EGU General Assembly 2019
Event Location:Vienna, Austria
Event Type:international Conference
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):Vorhaben asteroids and comets
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Haack, David
Deposited On:09 Dec 2019 09:31
Last Modified:09 Dec 2019 09:31

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