Rotating dust particles in the coma of comet 67P/Churyumov-Gerasimenko

Fulle, M.; Ivanovski, S.; Bertini, Ivano; Gutiérrez, P. J.; Lara, L. M.; Sierks, H.; Захаров, Владимир; Corte, Vincenzo Della; Rotundi, A.; Barbieri, C.; Lamy, Philippe; Rodrigo, R.; Koschny, D.; Rickman, H.; Keller, H. U.; Agarwal, Jessica; A’Hearn, Michael F.; Barucci, M. A.; Bertaux, Jean-Loup; Bodewits, Dennis; Cremonese, G.; Deppo, Vania Da; Davidsson, B.; Debei, S.; Cecco, M. De; Fornasier, S.; Groussin, O.; Güttler, C.; Hviid, S. F.; Ip, Wing-Huen; Jordá, L.; Knollenberg, J.; Kramm, R.; Kührt, Ekkehard; Küppers, M.; Lazzarin, M.; Moreno, J. J. Lopez; Marzari, F.; Michalik, H.; Naletto, G.; Oklay, N.; Sabau, L.; Thomas, N.; Tubiana, C.; Vincent, J.-B.; Wenzel, K. P.

doi:10.1051/0004-6361/201526158

Cited by 31 publications

(18 citation statements)

References 23 publications

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“…The masks pass through a process of morphologic operator dilatation and erosion (see Fig. 1) to fill the interruptions due to the noise and grain rotation (Fulle et al 2015b).…”

Section: Discussionmentioning

confidence: 99%

Photometry of dust grains of comet 67P and connection with nucleus regions

Cremonese

Simioni

Ragazzoni

et al. 2016

A&A

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Aims. Multiple pairs of high-resolution images of the dust coma of comet 67P/Churyumov-Gerasimenko have been collected by OSIRIS onboard Rosetta allowing extraction and analysis of dust grain tracks. Methods. We developed a quasi automatic method to recognize and to extract dust tracks in the Osiris images providing size, FWHM and photometric data. The dust tracks characterized by a low signal-to-noise ratio were checked manually. We performed the photometric analysis of 70 dust grain tracks observed on two different Narrow Angle Camera images in the two filters F24 and F28, centered at λ = 480.7 nm and at λ = 743.7 nm, respectively, deriving the color and the reddening of each one. We then extracted several images of the nucleus observed with the same filters and with the same phase angle to be compared with the dust grain reddening. Results. Most of the dust grain reddening is very similar to the nucleus values, confirming they come from the surface or subsurface layer. The histogram of the dust grain reddening has a secondary peak at negative values and shows some grains with values higher than the nucleus, suggesting a different composition from the surface grains. One hypothesis comes from the negative values point at the presence of hydrated minerals in the comet.

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“…The masks pass through a process of morphologic operator dilatation and erosion (see Fig. 1) to fill the interruptions due to the noise and grain rotation (Fulle et al 2015b).…”

Section: Discussionmentioning

confidence: 99%

Photometry of dust grains of comet 67P and connection with nucleus regions

Cremonese

Simioni

Ragazzoni

et al. 2016

A&A

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“…Compact GIADA particles can be associated with Wild 2 dense mineral grains, forming type A carrotlike thin trails (e.g., Hörz et al 2006;Rotundi et al 2014), and/or to cluster IDPs carving type B bulbous trails ending in stylus tracks (e.g., Hörz et al 2006;Rotundi et al 2008). Compact and dense particles with bulk density constrained in the range (1.9 ± 1.1) × 10 3 kg m −3 (Rotundi et al 2015;Fulle et al 2015b) and sizes (80 to 800 µm) that prevent their dynamics to be affected by coma and spacecraft potentials (Fulle et al 2015a). Fluffy and compact particles detected by GIADA show a different detection spatial distributions.…”

Section: Discussionmentioning

confidence: 99%

GIADA: shining a light on the monitoring of the comet dust production from the nucleus of 67P/Churyumov-Gerasimenko

Corte

Rotundi

Fulle

et al. 2015

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oro.open.ac.uk Aims. We aim to describe the dust spatial distribution in the coma of comet 67P by means of in situ measurements. We determine dynamical and physical properties of cometary dust particles to support the study of the production process and dust environment modification. Methods. We analyzed GIADA data with respect to the observation geometry and heliocentric distance to describe the coma dust spatial distribution of 67P, to monitor its activity, and to retrieve information on active areas present on its nucleus. We combined GIADA detection information with calibration activity to distinguish different types of particles that populate the coma of 67P: compact particles and fluffy porous aggregates. By means of particle dynamical parameters measured by GIADA, we studied the dust acceleration region.Results. GIADA was able to distinguish different types of particles populating the coma of 67P: compact particles and fluffy porous aggregates. Most of the compact particle detections occurred at latitudes and longitudes where the spacecraft was in view of the comet's neck region of the nucleus, the so-called Hapi region. This resulted in an oscillation of the compact particle abundance with respect to the spacecraft position and a global increase as the comet moved from 3.36 to 2.43 AU heliocentric distance. The speed of these particles, having masses from 10 −10 to 10 −7 kg, ranged from 0.3 to 12.2 m s −1 . The variation of particle mass and speed distribution with respect to the distance from the nucleus gave indications of the dust acceleration region. The influence of solar radiation pressure on micron and submicron particles was studied. The integrated dust mass flux collected from the Sun direction, that is, particles reflected by solar radiation pressure, was three times higher than the flux coming directly from the comet nucleus. The awakening 67P comet shows a strong dust flux anisotropy, confirming what was suggested by on-ground dust coma observations performed in 2008.

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“…The nucleus geometric albedo at 649 nm is 0.0677±0.0039 (Fornasier et al 2015), and it is reasonable to assume that large particles in the coma will have the same geometric albedo, provided they do not experience any change in their physical properties after ejection, such as sublimation of volatiles or fragmentation. These processes have been found to be negligible in the Rosetta studies of the 67P's coma (Fulle et al 2015).…”

Section: Models Assuming Size Distributions Of Randomly-oriented Partmentioning

confidence: 96%

“…The presence of aligned particles in the cometary environment has been subject of research for many years, since the early work of Dolginov & Mytrophanov (1976). In the nucleus acceleration region, comet gravity, and aerodynamic forces should dominate (Fulle et al 2015;Ivanovksi et al 2017a). Outside that region, radiative torques, although ignored for many years, might play an important role (see e.g.…”

Section: Models Assuming Size Distributions Of Particles Aligned To Tmentioning

confidence: 99%

Models of Rosetta/OSIRIS 67P Dust Coma Phase Function

Moreno

Guirado

Muñoz

et al. 2018

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The phase function of the dust coma of comet 67P has been determined from Rosetta/OSIRIS images (Bertini et al. 2017). This function show a deep minimum at phase angles near 100 • , and a strong backscattering enhancement. These two properties cannot be reproduced by regular models of cometary dust, most of them based on wavelength-sized and randomly-oriented aggregate particles. We show, however, that an ensamble of oriented elongated particles of a wide variety of aspect ratios, with radii r 10 µm, and whose long axes are perpendicular to the direction of the solar radiation, are capable of reproducing the observed

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Rotating dust particles in the coma of comet 67P/Churyumov-Gerasimenko

Cited by 31 publications

References 23 publications

Photometry of dust grains of comet 67P and connection with nucleus regions

Photometry of dust grains of comet 67P and connection with nucleus regions

GIADA: shining a light on the monitoring of the comet dust production from the nucleus of 67P/Churyumov-Gerasimenko

Models of Rosetta/OSIRIS 67P Dust Coma Phase Function

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