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Interpretation of thermal emission. I. The effect of roughness for spatially resolved atmosphereless bodies

Davidsson, B. and Rickman, Hans and Bandfield, J.L. and Groussin, Olivier and Gutierrez, P. J. and wilska, M and Capria, M. T. and Emery, J.P. and Helbert, Jörn and Jorda, L. and Maturilli, Alessandro and Mueller, T. (2015) Interpretation of thermal emission. I. The effect of roughness for spatially resolved atmosphereless bodies. Icarus: International Journal of Solar System Studies (252), pp. 1-21. Elsevier. DOI: 10.1016/j.icarus.2014.12.029 ISSN 0019-1035

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Official URL: http://www.sciencedirect.com/science/article/pii/S0019103514007209

Abstract

Spacecraft observations of atmosphereless Solar System bodies, combined with thermophysical modeling, provide important information about the thermal inertia and degree of surface roughness of these bodies. The thermophysical models rely on various methods of generating topography, the most common being the concave spherical segment. We here compare the properties of thermal emission for a number of different topographies – concave spherical segments, random Gaussians, fractals and parallel sinusoidal trenches – for various illumination and viewing geometries, degrees of surface roughness and wavelengths. We find that the thermal emission is strongly dependent on roughness type, even when the degrees of roughness are identical, for certain illumination and viewing geometries. The systematic usage of any single topography model may therefore bias determinations of thermal inertia and level of roughness. We outline strategies that may be employed during spacecraft observations to disentangle thermal inertia, level of roughness and type of topography. We also compare the numerically complex and time consuming full-scale thermophysical models with a simplified statistical approach, which is fairly easy to implement and quick to run. We conclude that the simplified statistical approach is similar to thermophysical models for cases tested here, which enables the user to analyze huge amounts of spectral data at a low numerical cost.

Item URL in elib:https://elib.dlr.de/101761/
Document Type:Article
Title:Interpretation of thermal emission. I. The effect of roughness for spatially resolved atmosphereless bodies
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Davidsson, B.Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala, SwedenUNSPECIFIED
Rickman, HansUppsala Astronomical ObservatoryUNSPECIFIED
Bandfield, J.L.Space Science Institute, 4750 Walnut St. Suite 205, Boulder, CO 80301, USAUNSPECIFIED
Groussin, OlivierLab. d'Astrophysique de Marseille, FranceUNSPECIFIED
Gutierrez, P. J.Instituto de Astrofísica de Andalucía – CSIC, Granada, SpainUNSPECIFIED
wilska, MPAN Space Research Center, Bartycka 18A, PL-00716 Warsaw, PolandUNSPECIFIED
Capria, M. T.Instituto di Astrofisica Spaziale e Fisica Cosmica, Roma, ItalyUNSPECIFIED
Emery, J.P.Department of Earth and Planetary Sciences, University of Tennessee, USAUNSPECIFIED
Helbert, JörnJoern.Helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505
Jorda, L.Laboratoire d'Astrophysique de Marseille, FranceUNSPECIFIED
Maturilli, AlessandroAlessandro.Maturilli (at) dlr.deUNSPECIFIED
Mueller, T.Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748 Garching, GermanyUNSPECIFIED
Date:May 2015
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.icarus.2014.12.029
Page Range:pp. 1-21
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Infrared observations; Spectroscopy; Asteroids, surfaces; Comets, nucleus; Moon, surface
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 - Vorhaben BepiColombo (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Maturilli, Alessandro
Deposited On:07 Jan 2016 09:52
Last Modified:01 Dec 2018 19:51

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