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  Coma morphology of comet 67P controlled by insolation over irregular nucleus

Shi, X., Hu, X., Mottola, S., Sierks, H., Keller, H. U., Rose, M., et al. (2018). Coma morphology of comet 67P controlled by insolation over irregular nucleus. Nature astronomy, 2, 562-567. doi:10.1038/s41550-018-0481-5.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-7579-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-209E-3
Genre: Journal Article

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 Creators:
Shi, Xian1, Author              
Hu, Xuanyu1, Author              
Mottola, S., Author
Sierks, Holger1, Author              
Keller, H. U., Author
Rose, M., Author
Güttler, Carsten1, Author              
Fulle, M., Author
Fornasier, S., Author
Agarwal, Jessica1, Author              
Pajola, M., Author
Tubiana, Cecilia1, Author              
Bodewits, D., Author
Barbieri, C., Author
Lamy, P. L., Author
Rodrigo, R., Author
Koschny, D., Author
Barucci, M. A., Author
Bertaux, J.-L., Author
Bertini, I., Author
Boudreault, Steve1, Author              Cremonese, G., AuthorDeppo, V. Da, AuthorDavidsson, B., AuthorDebei, S., AuthorCecco, M. De, AuthorDeller, Jakob1, Author              Groussin, O., AuthorGutiérrez, P. J., AuthorHviid, S. F., AuthorIp, W.-H., AuthorJorda, L., AuthorKnollenberg, J., AuthorKovacs, Gabor1, Author              Kramm, J. Rainer1, Author              Kührt, E., AuthorKüppers, M., AuthorLara, L. M., AuthorLazzarin, M., AuthorLopez-Moreno, J. J., AuthorMarzari, F., AuthorNaletto, G., AuthorOklay, N., AuthorToth, I., AuthorVincent, J.-B., Author more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 MPIS_PROJECTS: ROSETTA: OSIRIS
 Abstract: While the structural complexity of cometary comae is already recognizable from telescopic observations1, the innermost region, within a few radii of the nucleus, was not resolved until spacecraft exploration became a reality. The dust coma displays jet-like features of enhanced brightness superposed on a diffuse background. Some features can be traced to specific areas on the nucleus, and result conceivably from locally enhanced outgassing and/or dust emission. However, diffuse or even uniform activity over topographic concavity can converge to produce jet-like features. Therefore, linking observed coma morphology to the distribution of activity on the nucleus is difficult. Here, we study the emergence of dust activity at sunrise on comet 67P/Churyumov–Gerasimenko using high-resolution, stereo images from the OSIRIS camera onboard the Rosetta spacecraft, where the sources and formation of the jet-like features are resolved. We perform numerical simulations to show that the ambient dust coma is driven by pervasive but non-uniform water outgassing from the homogeneous surface layer. Physical collimations of gas and dust flows occur at local maxima of insolation and also via topographic focusing. Coma structures are projected to exhibit jet-like features that vary with the perspective of the observer. For an irregular comet such as 67P/Churyumov–Gerasimenko, near-nucleus coma structures can be concealed in the shadow of the nucleus, which further complicates the picture.

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Language(s): eng - English
 Dates: 2018-06-122018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41550-018-0481-5
 Degree: -

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Title: Nature astronomy
Source Genre: Journal
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Affiliations:
Publ. Info: London : Springer Nature
Pages: - Volume / Issue: 2 Sequence Number: - Start / End Page: 562 - 567 Identifier: Other: 2397-3366
CoNE: https://pure.mpg.de/cone/journals/resource/2397-3366