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Transport Characteristics of the Near-Surface Layer of the Nucleus of Comet 67P/Churyumov–Gerasimenko

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Abstract

The paper considers the free molecular flow of gas through the dusty porous surface layer of a comet nucleus. The study is based on computer models of generation of a porous medium and Knudsen gas diffusion. We consider various types of homogeneous and heterogeneous layers constructed from nonintersecting spheres, including layers that contain microcracks or inner cavities. Using the test-particle method, we quantitatively estimate the free path distribution function, layer permeability, and effective kinetic characteristics of sublimation products passing through a nonisothermal porous layer. In addition, in this approach, we consider the volumetric absorption of visible solar radiation in the near-surface absorbing layer. Simple approximation expressions are obtained for all the transport characteristics under study, which makes it possible to estimate the characteristics with sufficient accuracy for practical applications in the physics of comets. The results will be used to construct new consistent models of energy transfer in the near-surface layer of a comet nucleus and, first of all, to analyze the results of the observations of comet 67P/Churyumov‒Gerasimenko.

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Funding

V. Reshetnyk was supported by a grant from the Ministry of Education and Science of Ukraine 20BF051-02 [0120U102178] “Wave processes and effects in active resonant layered plasma media and metamaterials.” L. Rezac was supported by project DFG-392267849.

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Authors and Affiliations

  1. Taras Shevchenko National University of Kyiv, Kyiv, Ukraine

    V. Reshetnyk & M. Vasyuta

  2. Main Astronomical Observatory, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    V. Reshetnyk

  3. Max Planck Institute for Solar System Research, Göttingen, Germany

    Yu. Skorov, L. Rezac & J. Agarwal

  4. Institute for Geophysics and Extraterrestrial Physics, Technical University of Braunschweig, Braunschweig, Germany

    Yu. Skorov, J. Agarwal & J. Blum

  5. ESA/ESAC, Camino Bajo del Castillo s/n, Urb. Villafranca del Castillo, 28691, Villanueva de la Cañada, Spain

    M. Bentley

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  1. V. Reshetnyk
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Correspondence to Yu. Skorov.

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Translated by M. Chubarova

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Reshetnyk, V., Skorov, Y., Vasyuta, M. et al. Transport Characteristics of the Near-Surface Layer of the Nucleus of Comet 67P/Churyumov–Gerasimenko. Sol Syst Res 55, 106–123 (2021). https://doi.org/10.1134/S0038094621020040

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