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  The highly active Anhur–Bes regions in the 67P/Churyumov–Gerasimenko comet: results from OSIRIS/ROSETTA observations

Fornasier, S., Feller, C., Lee, J.-C., Ferrari, S., Massironi, M., Hasselmann, P. H., et al. (2017). The highly active Anhur–Bes regions in the 67P/Churyumov–Gerasimenko comet: results from OSIRIS/ROSETTA observations. Monthly Notices of the Royal Astronomical Society, 469(Suppl. 2), S93-S107. doi:10.1093/mnras/stx1275.

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Fornasier, S., Author
Feller, C., Author
Lee, J.-C., Author
Ferrari, S., Author
Massironi, M., Author
Hasselmann, P. H., Author
Deshapriya, J. D. P., Author
Barucci, M. A., Author
El-Maarry, M. R., Author
Giacomini, L., Author
Mottola, S., Author
Keller, H. U., Author
Ip, W.-H., Author
Lin, Z.-Y., Author
Sierks, Holger1, Author              
Barbieri, C., Author
Lamy, P. L., Author
Rodrigo, R., Author
Koschny, D., Author
Rickman, H., Author
Agarwal, Jessica1, Author              A'Hearn, M., AuthorBertaux, J.-L., AuthorBertini, I., AuthorCremonese, G., AuthorDeppo, V. Da, AuthorDavidsson, B., AuthorDebei, S., AuthorCecco, M. De, AuthorDeller, J., AuthorFulle, M., AuthorGroussin, O., AuthorGutierrez, P. J., AuthorGüttler, C., AuthorHofmann, M., AuthorHviid, S. F., AuthorJorda, L., AuthorKnollenberg, J., AuthorKovacs, G., AuthorKramm, R., AuthorKührt, E., AuthorKüppers, M., AuthorLara, M. L., AuthorLazzarin, M., AuthorMoreno, J. J. Lopez, AuthorMarzari, F., AuthorNaletto, G., AuthorOklay, N., AuthorPajola, M., AuthorShi, X., AuthorThomas, N., AuthorToth, I., AuthorTubiana, C., 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_GROUPS: Planets and Comets
 MPIS_PROJECTS: ROSETTA: OSIRIS
 Abstract: The Southern hemisphere of the 67P/Churyumov–Gerasimenko comet has become visible from Rosetta only since 2015 March. It was illuminated during the perihelion passage and therefore it contains the regions that experienced the strongest heating and erosion rates, thus exposing the sub-surface most pristine material. In this work we investigate, thanks to the OSIRIS images, the geomorphology, the spectrophotometry and some transient events of two Southern hemisphere regions: Anhur and part of Bes. Bes is dominated by outcropping consolidated terrain covered with fine particle deposits, while Anhur appears strongly eroded with elongated canyon-like structures, scarp retreats, different kinds of deposits and degraded sequences of strata indicating a pervasive layering. We discovered a new 140 m long and 10 m high scarp formed in the Anhur–Bes boundary during/after the perihelion passage, close to the area where exposed CO2 and H2O ices were previously detected. Several jets have been observed originating from these regions, including the strong perihelion outburst, an active pit and a faint optically thick dust plume. We identify several areas with a relatively bluer slope (i.e. a lower spectral slope value) than their surroundings, indicating a surface composition enriched with some water ice. These spectrally bluer areas are observed especially in talus and gravitational accumulation deposits where freshly exposed material had fallen from nearby scarps and cliffs. The investigated regions become spectrally redder beyond 2 au outbound when the dust mantle became thicker, masking the underlying ice-rich layers.

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Language(s): eng - English
 Dates: 2017-12-142017
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stx1275
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Affiliations:
Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 469 (Suppl. 2) Sequence Number: - Start / End Page: S93 - S107 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150