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

Marco Fulle 1, 2 Ivano Bertini 3, 2 Vincenzo Della Corte 4, 5, 2 Carsten Güttler 6, 2 Stavro L. Ivanovski 5, 4, 2 Florangela La Forgia 3, 2 Jérémie Lasue 7, 2 Anny Chantal Levasseur-Regourd 8, 2 Francesco Marzari 3, 2 Fernando Moreno 9, 2 Stefano Mottola 10, 2 Giampiero Naletto 11, 3, 2 Pasquale Palumbo 5, 2 Giovanna Rinaldi 4, 5, 2 Alessandra Rotundi 5, 4, 2 Holger Sierks 6, 2 Cesare Barbieri 2, 3 Philippe Lamy 12, 8 Rafael Rodrigo 13, 14 Detlef Koschny 15 Hans Rickman 16, 17 Maria Antonella Barucci 18 Jean-Loup Bertaux 8 Dennis Bodewits 19 Gabriele Cremonese 20 Vania da Deppo 21 Björn Davidsson 22 Stefano Debei 23 Mariolino de Cecco 24 Jakob Deller 6 Sonia Fornasier 18 Olivier Groussin 12 Pedro J. Gutiérrez 9 Stubbe F. Hviid 10 Wing-Huen Ip 25, 26 Laurent Jorda 12 Horst Uwe Keller 10, 27 Jörg Knollenberg 10 J. Rainer Kramm 6 Ekkehard Kührt 10 Michael Kuppers 28 Luisa Maria Lara 9 Monica Lazzarin 3 José Juan Lopez-Moreno 9 Xian Shi 6 Nicholas Thomas 29 Cécilia Tubiana 6
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
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) per cent of hydrocarbons versus the (62 ± 8) per cent of sulphides and silicates.
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Marco Fulle, Ivano Bertini, Vincenzo Della Corte, Carsten Güttler, Stavro L. Ivanovski, et al.. The phase function and density of the dust observed at comet 67P/Churyumov–Gerasimenko. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2018, 476 (2), pp.2835-2839. ⟨10.1093/mnras/sty464⟩. ⟨hal-02108705⟩