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Photometry of particulate mixtures: What controls the phase curve?

Pilorget, C. and Fernando, J. and Ehlmann, B. L. and Douté, S. (2015) Photometry of particulate mixtures: What controls the phase curve? Icarus, 250 . pp. 188-203. ISSN 0019-1035. doi:10.1016/j.icarus.2014.11.036.

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The amplitude and angular distribution of the light scattered by planetary surfaces give essential information about their physical and compositional properties. In particular, the angular variation of the bidirectional reflectance, characterized through the phase curve, is directly related to the grain size, shape and internal structure. We use a new radiative transfer model that allows specifying the photometric parameters of each grain individually to study the evolution of the phase curve for various kinds of mixtures (spatial, intimate and layered), mimicking different situations encountered for natural surfaces. Results show that the phase curve evolution is driven by the most abundant/brightest/highly anisotropic scattering grains within the mixture. Both spatial and intimate mixtures show similar trends in the phase curves when varying the photometric parameters of the grains. Simple laws have been produced to quantify the evolution of these variations. Layered mixtures have also been investigated and are generally very sensitive to the photometric properties of the top monolayer. Implications for the interpretation of photometric data and their link with the phases identified by spectroscopy are examined. The photometric properties of a few planetary bodies are also discussed over a couple of examples. These different results constitute a new support for the interpretation of orbital/in situ photometric datasets.

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Ehlmann, B. L.0000-0002-2745-3240
Additional Information:© 2014 Elsevier Inc. Received 4 August 2014; Revised 26 October 2014; Accepted 25 November 2014; Available online 11 December 2014. We would like to thank our colleagues at Caltech, GEOPS and IPAG for inspiration and advice. We are grateful to B. Hapke and an anonymous reviewer for their detailed and useful comments, and to the editorial team of Icarus for manuscript preparation and publication.
Subject Keywords:Photometry; Radiative transfer; Regoliths; Terrestrial planets
Record Number:CaltechAUTHORS:20150326-083412055
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Official Citation:C. Pilorget, J. Fernando, B.L. Ehlmann, S. Douté, Photometry of particulate mixtures: What controls the phase curve?, Icarus, Volume 250, April 2015, Pages 188-203, ISSN 0019-1035, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56104
Deposited By: Tony Diaz
Deposited On:27 Mar 2015 01:20
Last Modified:10 Nov 2021 20:54

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