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Effects of dust layers on thermal Emission from airless bodies

Biele, Jens and Kührt, Ekkehard and Senshu, Hiroki and Sakatani, Naoya and Ogawa, Kazunori and Hamm, Maximilian and Grott, Matthias and Okada, Tatsuaki and Arai, Takehiko (2019) Effects of dust layers on thermal Emission from airless bodies. Progress in Earth and Planetary Science, 6 (48). Springer. DOI: 10.1186/s40645-019-0291-0 ISSN 2197-4284

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: We have investigated the influence of thin thermally opaque dust layers on the thermal emission of rocks and regolith and determined the thermal response of these dust-covered surfaces to diurnal insolation cycles. Results are computed for Hayabusa2’s target asteroid (162173) Ryugu, which was observed by thermal infrared instruments on the orbiter and in situ. We show that even a very thin (10..100 μm) fine-grained porous dust layer with thermal inertia of 25 J m−2 K−1 s−1/2 can have a significant influence on surface temperatures and alter the apparent thermal inertia of the underlying material derived under the simplified assumption of a homogenous half space by more than 20%. The masking of the underlying material is complete at about 1 diurnal skin depth, corresponding to ~ 10 mm on Ryugu. Between 0.1 and 1 diurnal skin depths, we find a thermal lag smaller than what would be predicted for a surface consisting of dust only.

Item URL in elib:https://elib.dlr.de/128708/
Document Type:Article
Title:Effects of dust layers on thermal Emission from airless bodies
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Biele, JensJens.Biele (at) dlr.deUNSPECIFIED
Kührt, EkkehardEkkehard.Kuehrt (at) dlr.deUNSPECIFIED
Senshu, HirokiPlanetary Exploration Research Center, Chiba Institute of Technology, Narashino, JapanUNSPECIFIED
Sakatani, NaoyaInstitute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, JapanUNSPECIFIED
Ogawa, KazunoriDep. of Planetology, Kobe University, Kobe - JapanUNSPECIFIED
Hamm, Maximilianmaximilian.hamm (at) dlr.deUNSPECIFIED
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Okada, TatsuakiJAXA-ISAS, Sagamihara, JapanUNSPECIFIED
Arai, TakehikoDiv. of System and Information Eng. Ashikaga University, Tochigi - JapanUNSPECIFIED
Date:May 2019
Journal or Publication Title:Progress in Earth and Planetary Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.1186/s40645-019-0291-0
Series Name:Progress in Earth and Planetary Science
Keywords:Thermophysical models, Surfaces, Small bodies, Solar System, Thermal inertia, Dust cover, Layering
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):Project MASCOT Science and operation
Location: Berlin-Adlershof , Köln-Porz
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Planetary Research > Asteroids and Comets
Institute of Planetary Research > Planetary Physics
Deposited By: Herrmann, Astrid
Deposited On:07 Aug 2019 15:37
Last Modified:28 Oct 2019 12:41

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