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  Time evolution of dust deposits in the Hapi region of comet 67P/Churyumov-Gerasimenko

Cambianica, P., Fulle, M., Cremonese, G., Simioni, E., Naletto, G., Massironi, M., et al. (2020). Time evolution of dust deposits in the Hapi region of comet 67P/Churyumov-Gerasimenko. Astronomy and Astrophysics, 636: A91. doi:10.1051/0004-6361/202037485.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-9F39-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-9F3A-7
Genre: Journal Article

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 Creators:
Cambianica, P., Author
Fulle, M., Author
Cremonese, G., Author
Simioni, E., Author
Naletto, G., Author
Massironi, M., Author
Penasa, L., Author
Lucchetti, A., Author
Pajola, M., Author
Bertini, I., Author
Bodewits, D., Author
Ceccarelli, C., Author
Ferri, F., Author
Fornasier, S., Author
Frattin, E., Author
Güttler, Carsten1, Author              
Gutiérrez, P. J., Author
Keller, H. U., Author
Kührt, E., Author
Küppers, M., Author
La Forgia, F., AuthorLazzarin, M., AuthorMarzari, F., AuthorMottola, S., AuthorSierks, Holger1, Author              Toth, I., AuthorTubiana, Cecilia1, Author              Vincent, 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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 Abstract: Aims. We provide a measurement of the seasonal evolution of the dust deposit erosion and accretion in the Hapi region of comet 67P/Churyumov-Gerasimenko with a vertical accuracy of 0.2–0.9 m. Methods. We used OSIRIS Narrow Angle Camera images with a spatial scale of lower than 1.30 m px−1 and developed a tool to monitor the time evolution of 22 boulder heights with respect to the surrounding dust deposit. The tool is based on the measurement of the shadow length projected by the boulder on the surrounding pebble deposit. Assuming the position of the boulders does not change during the observational period, boulder height variations provide an indication of how the thickness of the surrounding dust layer varies over time through erosion and accretion phenomena. Results. We measured an erosion of the dust deposit of 1.7 ± 0.2 m during the inbound orbit until 12 December, 2014. This value nearly balances the fallout from the southern hemisphere during perihelion cometary activity. During the perihelion phase, the dust deposit then increased by 1.4 ± 0.8 m. This is interpreted as a direct measurement of the fallout thickness. By comparing the erosion rate and dust volume loss rate at the Hapi region measured in the coma, the fallout represents ~96% in volume of the ejecta. The amount of the eroded pristine material from the southern hemisphere, together with its subsequent transport and fallout on the nucleus, led us to discuss the pristine water ice abundance in comet 67P. We determine that the refractory-to-ice mass ratio ranges from 6 to 110 in the perihelion-eroded pristine nucleus, providing a pristine ice mass fraction of (8 ± 7)% in mass.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1051/0004-6361/202037485
 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: 636 Sequence Number: A91 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1