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Cometary surface dust layers built out of millimetre-scale aggregates: dependence of modelled cometary gas production on the layer transport properties

Skorov, Yuri and Markkanen, J and Reshetnyk, V and Mottola, Stefano and Küppers, M. and Besse, S. and El-Maarry, M.R. and Hartogh, Paul (2023) Cometary surface dust layers built out of millimetre-scale aggregates: dependence of modelled cometary gas production on the layer transport properties. Monthly Notices of the Royal Astronomical Society, 522 (3), pp. 4781-4800. Oxford University Press. doi: 10.1093/mnras/stad1330. ISSN 0035-8711.

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Official URL: https://academic.oup.com/mnras/article/522/3/4781/7158689

Abstract

The standard approach to obtaining knowledge about the properties of the surface layer of a comet from observations of gas production consists of two stages. First, various thermophysical models are used to calculate gas production for a few sets of parameters. Second, a comparison of observations and theoretical predictions is performed. This approach is complicated because the values of many model characteristics are known only approximately. Therefore, it is necessary to investigate the sensitivity of the simulated outgassing to variations in the properties of the surface layer. This problem was recently considered by us for aggregates up to tens of microns in size. For millimetre-size aggregates, a qualitative extension of the method used to model the structural characteristics of the layer is required. It is also necessary to study the role of radiative thermal conductivity, which may play an important role for such large particles. We investigated layers constructed from large aggregates and having various thicknesses and porosity and evaluated the effective sublimation of water ice at different heliocentric distances. For radiati ve conducti vity, approximate commonly used models and the complicated model based on the dense-medium radiati ve transfer theory were compared. It was shown that for millimetre-size aggregates careful consideration of the radiative thermal conductivity is required since this mechanism of energy transfer may change the resulting gas productivity by several times. We demonstrate that our model is more realistic for an evolved comet than simple models parameterizing the properties of the cometary surface layer, yet maintains comparable computational complexity.

Item URL in elib:https://elib.dlr.de/195925/
Document Type:Article
Title:Cometary surface dust layers built out of millimetre-scale aggregates: dependence of modelled cometary gas production on the layer transport properties
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Skorov, YuriMax-Planck-Institut für Sonnensystemforschung, GöttingenUNSPECIFIEDUNSPECIFIED
Markkanen, JInstitut für Geophysik und Extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstr 3, D-38106 Braunschweig, GermanyUNSPECIFIEDUNSPECIFIED
Reshetnyk, VTaras Shevchenko National University of Kyiv, Glushkova ave . 2, 01601 Kyiv, UkraineUNSPECIFIEDUNSPECIFIED
Mottola, StefanoUNSPECIFIEDhttps://orcid.org/0000-0002-0457-3872UNSPECIFIED
Küppers, M.ESA-ESAC, Camino Bajo del Castillo, s/n., 28692 Villanueva de la Cañada, Madrid, SpagnaUNSPECIFIEDUNSPECIFIED
Besse, S.European Space Astronomy Centre, 28692 Villanueva de la Canada, Madrid, SpainUNSPECIFIEDUNSPECIFIED
El-Maarry, M.R.Space and Planetary Science Center, and Department of Earth Sciences, Khalifa University, Abu Dhabi, UAEUNSPECIFIEDUNSPECIFIED
Hartogh, PaulMax-Planck-Institut für Sonnensystemforschung, GöttingenUNSPECIFIEDUNSPECIFIED
Date:11 May 2023
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:522
DOI:10.1093/mnras/stad1330
Page Range:pp. 4781-4800
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:numerical methods, comets, 67P/Churyumov-Gerasimenko.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - CO-I Participations
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:11 Jul 2023 15:33
Last Modified:30 Jan 2024 11:05

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