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  Exposed bright features on the comet 67P/Churyumov–Gerasimenko: distribution and evolution

Deshapriya, J. D. P., Barucci, M. A., Fornasier, S., Hasselmann, P. H., Feller, C., Sierks, H., et al. (2018). Exposed bright features on the comet 67P/Churyumov–Gerasimenko: distribution and evolution. Astronomy and Astrophysics, 613: A36. doi:10.1051/0004-6361/201732112.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-7573-A Version Permalink: http://hdl.handle.net/21.11116/0000-0002-1025-2
Genre: Journal Article

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Deshapriya, J. D. P., Author
Barucci, M. A., Author
Fornasier, S., Author
Hasselmann, P. H., Author
Feller, C., Author
Sierks, Holger1, Author              
Lucchetti, A., Author
Pajola, M., Author
Oklay, N., Author
Mottola, S., Author
Masoumzadeh, Nafiseh2, Author              
Tubiana, Cecilia1, Author              
Güttler, Carsten1, Author              
Barbieri, C., Author
Lamy, P. L., Author
Rodrigo, R., Author
Koschny, D., Author
Rickman, H., Author
Bertaux, J.-L., Author
Bertini, I., Author
Bodewits, D., AuthorBoudreault, Steve1, Author              Cremonese, G., AuthorDeppo, V. Da, AuthorDavidsson, B. J. R., AuthorDebei, S., AuthorCecco, M. De, AuthorDeller, Jakob1, Author              Fulle, M., AuthorGroussin, O., AuthorGutierrez, P. J., AuthorHoang, H. V., AuthorHviid, S. F., AuthorIp, W., AuthorJorda, L., AuthorKeller, H. U., AuthorKnollenberg, J., AuthorKramm, J. Rainer1, Author              Kührt, E., AuthorKüppers, M., AuthorLara, L., AuthorLazzarin, M., AuthorMoreno, J. J. Lopez, AuthorMarzari, F., AuthorNaletto, G., AuthorPreusker, F., AuthorShi, Xian1, Author              Thomas, N., AuthorVincent, J.-B., Author more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              
2IMPRS on Physical Processes in the Solar System and Beyond, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832290              

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Free keywords: comets: individual: 67P/Churyumov–Gerasimenko / techniques: photometric / methods: data analysis
 MPIS_PROJECTS: ROSETTA: OSIRIS
 Abstract: Context. Since its arrival at the comet 67P/Churyumov–Gerasimenko in August 2014, the Rosetta spacecraft followed the comet as it went past the perihelion and beyond until September 2016. During this time there were many scientific instruments operating on board Rosetta to study the comet and its evolution in unprecedented detail. In this context, our study focusses on the distribution and evolution of exposed bright features that have been observed by OSIRIS, which is the scientific imaging instrument aboard Rosetta. Aims. We envisage investigating various morphologies of exposed bright features and the mechanisms that triggered their appearance. Methods. We co-registered multi-filter observations of OSIRIS images that are available in reflectance. The Lommel–Seeliger disk function was used to correct for the illumination conditions and the resulting colour cubes were used to perform spectrophotometric analyses on regions of interest. Results. We present a catalogue of 57 exposed bright features observed on the nucleus of the comet, all of which are attributed to the presence of H2O ice on the comet. Furthermore, we categorise these patches under four different morphologies and present geometric albedos for each category. Conclusions. Although the nucleus of 67P/Churyumov–Gerasimenko appears to be dark in general, there are localised H2O ice sources on the comet. Cometary activity escalates towards the perihelion passage and reveals such volatile ices. We propose that isolated H2O ice patches found in smooth terrains in regions, such as Imhotep, Bes, and Hapi, result from frost as an aftermath of the cessation of the diurnal water cycle on the comet as it recedes from perihelion. Upon the comet’s return to perihelion, such patches are revealed when sublimation-driven erosion removes the thin dust layers that got deposited earlier. More powerful activity sources such as cometary outbursts are capable of revealing much fresher, less contaminated H2O ice that is preserved with consolidated cometary material, as observed on exposed patches resting on boulders. This is corroborated by our albedo calculations that attribute higher albedos for bright features with formations related to outbursts.

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Language(s): eng - English
 Dates: 2018-06-122018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1051/0004-6361/201732112
 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: 613 Sequence Number: A36 Start / End Page: - Identifier: ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1