Interpretation through experimental simulations of phase functions revealed by Rosetta in 67P/Churyumov-Gerasimenko dust coma

Anny Chantal Levasseur-Regourd 1 Jean-Baptiste Renard 2 Edith Hadamcik 1 Jeremie Lasue 3 Ivano Bertini 4 Marco Fulle 5
1 IMPEC - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
2 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
3 IRAP - Institut de recherche en astrophysique et planétologie
4 Dipartimento di Fisica e Astronomia "Galileo Galilei"
5 OAT - INAF - Osservatorio Astronomico di Trieste
Abstract : The dust-brightness phase curves that have been measured by the OSIRIS cameras on board the Rosetta spacecraft within the coma of comet 67P/Churyumov-Gerasimenko (67P) present a remarkable flattened u-shape. Aims. Our goal is to compare these phase curves with those of tentatively analog dust samples to assess the key dust properties that might induce this shape. Light-scattering measurements have been made with the PROGRA2 instrument in the laboratory and in microgravity conditions on samples of different physical properties and compositions that are likely to be representative of cometary dust particles. We find that the brightness phase curves of a series of interplanetary dust analogs that have been recently developed (to fit the polarimetric properties of the inner zodiacal cloud and their changes with heliocentric distance) are quite comparable to those of 67P. Key dust properties seem to be related to the composition and the porosity. We conclude that the shape of the brightness phase curves of 67P has to be related to the presence of a significant amount of organic compounds (at least 50% in mass) and of fluffy aggregates (of a size range of 10–200 μm). We also confirm similarities between the dust particles of this Jupiter-family comet and the particles within the inner zodiacal cloud.
Document type :
Journal articles
Complete list of metadatas

Cited literature [41 references]  Display  Hide  Download
https://hal-insu.archives-ouvertes.fr/insu-02114611
Contributor : Catherine Cardon <>
Submitted on : Saturday, September 21, 2019 - 11:57:52 AM
Last modification on : Friday, January 10, 2020 - 9:09:53 PM

File

aa34894-18.pdf
Publisher files allowed on an open archive

Identifiers

Collections

OBSPM | SORBONNE-UNIVERSITE | UNIV-PARIS-SACLAY | PSL | LPC2E | UVSQ | OSUC | LATMOS | OMP-IRAP | OMP | UNIV-ORLEANS | CNRS | UNIV-TLSE3 | INSU | SU-SCIENCES

Citation

Anny Chantal Levasseur-Regourd, Jean-Baptiste Renard, Edith Hadamcik, Jeremie Lasue, Ivano Bertini, et al.. Interpretation through experimental simulations of phase functions revealed by Rosetta in 67P/Churyumov-Gerasimenko dust coma. Astronomy and Astrophysics - A&A, EDP Sciences, 2019, 630, A20 (6 p.). ⟨10.1051/0004-6361/201834894⟩. ⟨insu-02114611⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

106

Files downloads

52

Contact

Informations

CCSD