Interpretation of the Phase Functions Measured by the OSIRIS Instrument for Comet 67P/Churyumov-Gerasimenko

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Markkanen , J , Agarwal , J , Väisänen , T , Penttilä , A & Muinonen , K 2018 , ' Interpretation of the Phase Functions Measured by the OSIRIS Instrument for Comet 67P/Churyumov-Gerasimenko ' , Astrophysical Journal Letters , vol. 868 , no. 1 , 16 . https://doi.org/10.3847/2041-8213/aaee10

Title: Interpretation of the Phase Functions Measured by the OSIRIS Instrument for Comet 67P/Churyumov-Gerasimenko
Author: Markkanen, Johannes; Agarwal, Jessica; Väisänen, Timo; Penttilä, Antti; Muinonen, Karri
Contributor organization: Department of Physics
Particle Physics and Astrophysics
Planetary-system research
Date: 2018-11-20
Language: eng
Number of pages: 5
Belongs to series: Astrophysical Journal Letters
ISSN: 2041-8205
DOI: https://doi.org/10.3847/2041-8213/aaee10
URI: http://hdl.handle.net/10138/268060
Abstract: We show that the scattering phase functions of the coma and the nucleus of the comet 67P/Churyumov-Gerasimenko measured by the Rosetta/Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) instrument can be reproduced by a particle model involving clustered, densely packed submicrometer-sized grains composed of organic material and larger micrometer-sized silicate grains. The simulated and measured coma phase functions suggest that near the nucleus scattering is dominated by large particles, and the size distribution of dust particles varies with time and/or local coma environment. Further, we show that the measured nucleus phase function is consistent with the coma phase function by modeling a nucleus-sized object consisting of the same particles that explain the coma phase functions.
Subject: comets : individual (67P)
methods: numerical
scattering
DISCRETE RANDOM-MEDIA
LIGHT-SCATTERING
DUST PARTICLES
RAY OPTICS
WAVELENGTHS
115 Astronomy, Space science
Peer reviewed: Yes
Rights: unspecified
Usage restriction: openAccess
Self-archived version: publishedVersion


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