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Structure and elastic parameters of the near surface of Abydos site on Comet 67P/Churyumov-Gerasimenko, as obtained by SESAME/CASSE listening to the MUPUS insertion phase

Knapmeyer, Martin and Fischer, Hans-Herbert and Knollenberg, Jörg and Seidensticker, Klaus J. and Thiel, K. and Arnold, Walter and Faber, Claudia and Möhlmann, D. (2018) Structure and elastic parameters of the near surface of Abydos site on Comet 67P/Churyumov-Gerasimenko, as obtained by SESAME/CASSE listening to the MUPUS insertion phase. Icarus, pp. 165-193. Elsevier. DOI: 10.1016/j.icarus.2017.12.002 ISSN 0019-1035

Full text not available from this repository.

Official URL: http://authors.elsevier.com/sd/article/S0019103517304165

Abstract

The accelerometers of the SESAME/CASSE instrument aboard Rosetta's lander Philae recorded surface waves produced during the MUPUS hammering phase. After presenting evidence that all feet of Philae were in contact with the ground, we analyze group arrival time differences between the three feet of Philae and obtain a Rayleigh wave velocity between 79ms−1 and 400ms−1, which translate into a shear modulus μ of 3.6 MPa ≤ μ ≤ 346 MPa, and a Young's modulus E of 7.2 MPa ≤ E ≤ 980 MPa (with the lower bounds being better constrained than the upper bounds). Mixture models of snow and regolith suggest a porosity below 0.74. From the frequency-dependent dispersion of the average signal we conclude that the above values are valid for a surface layer of 10 cm to 50 cm thickness, while rigidity is significantly reduced underneath this layer. Our findings are consistent with the concept of a thin consolidated shell around a less rigid interior.

Item URL in elib:https://elib.dlr.de/117287/
Document Type:Article
Additional Information:Open Access under Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Title:Structure and elastic parameters of the near surface of Abydos site on Comet 67P/Churyumov-Gerasimenko, as obtained by SESAME/CASSE listening to the MUPUS insertion phase
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knapmeyer, MartinMartin.Knapmeyer (at) dlr.dehttps://orcid.org/0000-0003-0319-2514
Fischer, Hans-HerbertHans-Herbert.Fischer (at) dlr.dehttps://orcid.org/0000-0003-4887-3911
Knollenberg, JörgJoerg.Knollenberg (at) dlr.deUNSPECIFIED
Seidensticker, Klaus J.Klaus.Seidensticker (at) dlr.dehttps://orcid.org/0000-0003-3671-3769
Thiel, K.UNSPECIFIEDUNSPECIFIED
Arnold, WalterUniv. Saarbrücken, Univ. GöttingenUNSPECIFIED
Faber, Claudiaclaudia.faber (at) dlr.deUNSPECIFIED
Möhlmann, D.UNSPECIFIEDUNSPECIFIED
Date:August 2018
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.icarus.2017.12.002
Page Range:pp. 165-193
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:SESAME; CASSE; MUPUS; Comet 67P/Churyumov-Gerasimenko; Active seismics
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 Lander
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Planetary Research > Planetary Physics
Deposited By: Knapmeyer, Dr. Martin
Deposited On:10 Sep 2018 15:14
Last Modified:06 Sep 2019 15:26

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