Knapmeyer, M., Fischer, H-H., Knollenberg, J., Seidensticker, Kj., Thiel, K., Arnold, W., Faber, C. and Moehlmann, 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, 310. S. 165 - 194. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1090-2643

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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 79 m s(-1) and 400 m s(-1) ', which translate into a shear modulus mu 3.6 MPa <=mu <= 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. (C) 2017 The Authors. Published by Elsevier Inc.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Knapmeyer, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fischer, H-H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Knollenberg, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Seidensticker, Kj.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Thiel, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Arnold, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Faber, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moehlmann, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-177228
DOI: 10.1016/j.icarus.2017.12.002
Journal or Publication Title: Icarus
Volume: 310
Page Range: S. 165 - 194
Date: 2018
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication: SAN DIEGO
ISSN: 1090-2643
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ROSETTA LANDER PHILAE; MECHANICAL-PROPERTIES; ACOUSTIC PROPERTIES; DUST PARTICLES; LANDING SITE; ICE; VELOCITY; NUCLEUS; AEROGELS; MANTLEMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/17722

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