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  Linking surface morphology, composition, and activity on the nucleus of 67P/Churyumov-Gerasimenko

Fornasier, S., Hoang, V. H., Hasselmann, P. H., Feller, C., Barucci, M. A., Deshapriya, J. D. P., et al. (2019). Linking surface morphology, composition, and activity on the nucleus of 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics, 630: A7. doi:10.1051/0004-6361/201833803.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-0A1A-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-0A1B-3
Genre: Journal Article

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Astrophysics Data System (ADS) (Abstract)
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Fornasier, S., Author
Hoang, V. H., Author
Hasselmann, P. H., Author
Feller, C., Author
Barucci, M. A., Author
Deshapriya, J. D. P., Author
Sierks, Holger1, Author              
Naletto, G., Author
Lamy, P. L., Author
Rodrigo, R., Author
Koschny, D., Author
Davidsson, B., Author
Agarwal, Jessica1, Author              
Barbieri, C., Author
Bertaux, J.-L., Author
Bertini, I., Author
Bodewits, D., Author
Cremonese, G., Author
Da Deppo, V. , Author
Debei, S., Author
De Cecco, M. , AuthorDeller, Jakob1, Author              Ferrari, S., AuthorFulle, M., AuthorGutierrez, P. J., AuthorGüttler, Carsten1, Author              Ip, W.-H., AuthorKeller, H. U., AuthorKüppers, M., AuthorLa Forgia, F., AuthorLara, M. L., AuthorLazzarin, M., AuthorLin, Z-Y, AuthorLopez Moreno, J. J. , AuthorMarzari, F., AuthorMottola, S., AuthorPajola, M., AuthorShi, Xian1, Author              Toth, I., AuthorTubiana, Cecilia1, Author               more..
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: comets: individual: 67P/Churyumov-Gerasimenko / methods: data analysis / methods: observational / techniques: photometric
 MPIS_PROJECTS: ROSETTA: OSIRIS
 Abstract: Aims. The Rosetta space probe accompanied comet 67P/Churyumov-Gerasimenko for more than two years, obtaining an unprecedented amount of unique data of the comet nucleus and inner coma. This has enabled us to study its activity almost continuously from 4 au inbound to 3.6 au outbound, including the perihelion passage at 1.24 au. This work focuses identifying the source regions of faint jets and outbursts and on studying the spectrophotometric properties of some outbursts. We use observations acquired with the OSIRIS/NAC camera during July–October 2015, that is, close to perihelion. Methods. We analyzed more than 2000 images from NAC color sequences acquired with 7–11 filters covering the 250–1000 nm wavelength range. The OSIRIS images were processed with the OSIRIS standard pipeline up to level 3, that is, converted in radiance factor, then corrected for the illumination conditions. For each color sequence, color cubes were produced by stacking registered and illumination-corrected images. Results. More than 200 jets of different intensities were identified directly on the nucleus. Some of the more intense outbursts appear spectrally bluer than the comet dark terrain in the visible-to-near-infrared region. We attribute this spectral behavior to icy grains mixed with the ejected dust. Some of the jets have an extremely short lifetime. They appear on the cometary surface during the color sequence observations, and vanish in less than some few minutes after reaching their peak. We also report a resolved dust plume observed in May 2016 at a resolution of 55 cm pixel−1, which allowed us to estimate an optical depth of ~0.65 and an ejected mass of ~2200 kg, assuming a grain bulk density of ~800 kg m−3. We present the results on the location, duration, and colors of active sources on the nucleus of 67P from the medium-resolution (i.e., 6–10 m pixel−1) images acquired close to perihelion passage. The observed jets are mainly located close to boundaries between different morphological regions. Some of these active areas were observed and investigated at higher resolution (up to a few decimeter per pixel) during the last months of operations of the Rosetta mission. Conclusions. These observations allow us to investigate the link between morphology, composition, and activity of cometary nuclei. Jets depart not only from cliffs, but also from smooth and dust-covered areas, from fractures, pits, or cavities that cast shadows and favor the recondensation of volatiles. This study shows that faint jets or outbursts continuously contribute to the cometary activity close to perihelion passage, and that these events are triggered byillumination conditions. Faint jets or outbursts are not associated with a particular terrain type or morphology.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1051/0004-6361/201833803
arXiv: 1809.03997
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 630 Sequence Number: A7 Start / End Page: - Identifier: Other: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1