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  The phase function and density of the dust observed at comet 67P/Churyumov–Gerasimenko

Fulle, M., Bertini, I., Corte, V. D., Güttler, C., Ivanovski, S., La Forgia, F., et al. (2018). The phase function and density of the dust observed at comet 67P/Churyumov–Gerasimenko. Monthly Notices of the Royal Astronomical Society, 476(2), 2835-2839. doi:10.1093/mnras/sty464.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-432E-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-432F-0
Genre: Journal Article

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 Creators:
Fulle, Marco, Author
Bertini, I, Author
Corte, V Della, Author
Güttler, Carsten1, Author              
Ivanovski, S, Author
La Forgia, F, Author
Lasue, J, Author
Levasseur-Regourd, A C, Author
Marzari, F, Author
Moreno, F, Author
Mottola, S, Author
Naletto, G, Author
Palumbo, P, Author
Rinaldi, G, Author
Rotundi, A, Author
Sierks, Holger1, Author              
Barbieri, C, Author
Lamy, P L, Author
Rodrigo, R, Author
Koschny, D, Author
Rickman, H, AuthorBarucci, M A, AuthorBertaux, J-L, AuthorBodewits, D, AuthorCremonese, G, AuthorDeppo, V Da, AuthorDavidsson, B, AuthorDebei, S, AuthorCecco, M De, AuthorDeller, Jakob1, Author              Fornasier, S, AuthorGroussin, O, AuthorGutiérrez, P J, AuthorHviid, H S, AuthorIp, W H, AuthorJorda, L, AuthorKeller, H U, AuthorKnollenberg, J, AuthorKramm, J. Rainer1, Author              Kührt, E, AuthorKüppers, M, AuthorLara, M L, AuthorLazzarin, M, AuthorLópez-Moreno, J J, AuthorShi, Xian1, Author              Thomas, N, 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: space vehicles, comets: general, comets: individual: 67P/Churyumov–Gerasimenko
 MPIS_PROJECTS: ROSETTA: OSIRIS
 Abstract: The OSIRIS camera onboard Rosetta measured the phase function of both the coma dust and the nucleus. The two functions have a very different slope versus the phase angle. Here, we show that the nucleus phase function should be adopted to convert the brightness to the size of dust particles larger than 2.5 mm only. This makes the dust bursts observed close to Rosetta by OSIRIS, occurring about every hour, consistent with the fragmentation on impact with Rosetta of parent particles, whose flux agrees with the dust flux observed by GIADA. OSIRIS also measured the antisunward acceleration of the fragments, thus providing the first direct measurement of the solar radiation force acting on the dust fragments and thus of their bulk density, excluding any measurable rocket effect by the ice sublimation from the dust. The obtained particle density distribution has a peak matching the bulk density of most COSIMA particles, and represents a subset of the density distribution measured by GIADA. This implies a bias in the elemental abundances measured by COSIMA, which thus are consistent with the 67P dust mass fractions inferred by GIADA, i.e. (38±8)percent of hydrocarbons versus the (62±8)percent of sulphides and silicates.

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Language(s): eng - English
 Dates: 2018-05-082018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/sty464
 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: 476 (2) Sequence Number: - Start / End Page: 2835 - 2839 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150