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  Thermophysics of fractures on comet 67P/Churyumov-Gerasimenko

Höfner, S., Vincent, J.-B., Blum, J., Davidsson, B. J. R., Sierks, H., El-Maarry, M. R., et al. (2017). Thermophysics of fractures on comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics, 608: A121. doi:10.1051/0004-6361/201628726.

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Höfner, Sebastian1, Author              
Vincent, Jean-Baptiste1, Author              
Blum, J., Author
Davidsson, B. J. R., Author
Sierks, Holger1, Author              
El-Maarry, M. R., Author
Deller, Jakob1, Author              
Hofmann, M., Author
Hu, X., Author
Pajola, M., Author
Barbieri, C., Author
Lamy, P. L., Author
Rodrigo, R., Author
Koschny, D., Author
Rickman, H., Author
Keller, H. U., Author
A’Hearn, M. F., Author
Auger, A.-T., Author
Barucci, M. A., Author
Bertaux, J.-L., Author
Bertini, I., AuthorBodewits, D., AuthorCremonese, G., AuthorDeppo, V. Da, AuthorDebei, S., AuthorCecco, M. De, AuthorFornasier, S., AuthorFulle, M., AuthorGicquel, A., AuthorGroussin, O., AuthorGutiérrez, P. J., AuthorGutiérrez-Marqués, P., AuthorGüttler, C., AuthorHviid, S. F., AuthorIp, W.-H., AuthorJorda, L., AuthorKnollenberg, J., AuthorKovacs, G., AuthorKramm, J.-R., AuthorKührt, E., AuthorKüppers, M., AuthorLa Forgia, F., AuthorLazzarin, M., AuthorLopez-Moreno, J. J., AuthorMarzari, F., AuthorMichalik, H., AuthorMoissl-Fraund, R., AuthorMoreno, F., AuthorMottola, S., AuthorNaletto, G., AuthorOklay, N., AuthorPreusker, F., AuthorScholten, F., AuthorShi, Xian1, Author              Thomas, N., AuthorToth, I., AuthorTubiana, Cecilia1, Author              Zitzmann, S., Author more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 MPIS_GROUPS: Planets and Comets
 MPIS_PROJECTS: ROSETTA: OSIRIS
 Abstract: Context. The camera OSIRIS on board Rosetta obtained high-resolution images of the nucleus of comet 67P/Churyumov-Gerasimenko (67P). Great parts of the nucleus surface are composed of fractured terrain. Aims. Fracture formation, evolution, and their potential relationship to physical processes that drive activity are not yet fully understood. Observed temperatures and gas production rates can be explained or interpreted with the presence of fractures by applying appropriate modelling methods. Methods. We followed a transient thermophysical model approach that includes radiative, conductive, and water-ice sublimation fluxes by considering a variety of heliocentric distances, illumination conditions, and thermophysical properties for a set of characteristic fracture geometries on the nucleus of 67P. We computed diurnal temperatures, heat fluxes, and outgassing behaviour in order to derive and distinguish the influence of the mentioned parameters on fractured terrain. Results. Our analysis confirms that fractures, as already indicated by former studies about concavities, deviate from flat-terrain topographies with equivalent properties, mostly through the effect of self-heating. Compared to flat terrain, illuminated cometary fractures are generally warmer, with smaller diurnal temperature fluctuations. Maximum sublimation rates reach higher peaks, and dust mantle quenching effects on sublimation rates are weaker. Consequently, the rough structure of the fractured terrain leads to significantly higher inferred surface thermal inertia values than for flat areas with identical physical properties, which might explain the range of measured thermal inertia on 67P. Conclusions. At 3.5 AU heliocentric distance, sublimation heat sinks in fractures converge to maximum values >50 W / m2 and trigger dust activity that can be related mainly to H2O. Fractures are likely to grow through the erosive interplay of alternating sublimation and thermal fatigue.

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Language(s): eng - English
 Dates: 2018-01-092017
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/201628726
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Berlin : Springer-Verlag
Pages: - Volume / Issue: 608 Sequence Number: A121 Start / End Page: - Identifier: ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1