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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Thermal and mechanical properties of the near-surface layers of comet 67P/Churyumov-Gerasimenko
Author(s): Spohn, Tilman
Knollenberg, Joerg
Ball, Andrew J
Banaszkiewicz, Marek
Benkhoff, Johannes
Grott, Matthias
Grygorczuk, Jerzy
Hüttig, Christian
Hagermann, Axel
Kargl, Günter
Kaufmann, Erika
Kömle, Norbert
Kührt, Ekkehard
Kossacki, Konrad J
Marczewski, Wojciech
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Issue Date: 31-Jul-2015
Citation: Spohn T, Knollenberg J, Ball A, Banaszkiewicz M, Benkhoff J, Grott M, Grygorczuk J, Hüttig C, Hagermann A, Kargl G, Kaufmann E, Kömle N, Kührt E, Kossacki K & Marczewski W (2015) Thermal and mechanical properties of the near-surface layers of comet 67P/Churyumov-Gerasimenko, Science, 349 (6247), Art. No.: aab0464.
Abstract: Thermal and mechanical material properties determine comet evolution and even solar system formation because comets are considered remnant volatile-rich planetesimals. Using data from the Multipurpose Sensors for Surface and Sub-Surface Science (MUPUS) instrument package gathered at the Philae landing site Abydos on comet 67P/Churyumov-Gerasimenko, we found the diurnal temperature to vary between 90 and 130 K.The surface emissivity was 0.97, and the local thermal inertia was 85 ± 35 J m-2 K-1s-1/2-.The MUPUS thermal probe did not fully penetrate the near-surface layers, suggesting a local resistance of the ground to penetration of >4 megapascals, equivalent to >2 megapascal uniaxial compressive strength. A sintered near-surface microporous dust-ice layer with a porosity of 30 to 65% is consistent with the data.
DOI Link: 10.1126/science.aab0464
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Notes: Additional co-authors: I. Pelivan, R. Schrödter, K. Seiferlin

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