Density and Charge of Pristine Fluffy Particles From Comet 67p/Churyumov–gerasimenko

Fulle, M.; Corte, Vincenzo Della; Rotundi, A.; Weissman, P. R.; Juhász, Á.; Szegö, K.; Sordini, R.; Ferrari, M.; Ivanovski, S.; Lucarelli, F.; Accolla, M.; Merouane, S.; Захаров, Владимир; Epifani, E. Mazzotta; Moreno, J. J. Lopez; Rodriguez, J.; Colangeli, L.; Palumbo, P.; Grün, E.; Hilchenbach, M.; Bussoletti, E.; Esposito, F.; Green, Simon; Lamy, Philippe; McDonnell, J. A. M.; Mennella, V.; Molina, A.; Morales, R.; Moreno, Fernando; Ortiz, J. L.; Palomba, E.; Rodrigo, R.; Zarnecki, J. C.; Cosi, M.; Giovane, F.; Gustafson, B. Å. S.; Herranz, M.; Jeronimo, J. M.; Leese, M. R.; López-Jiménez, A.; Altobelli, Nicolás

doi:10.1088/2041-8205/802/1/l12

Cited by 140 publications

(104 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…GIADA was able to distinguish different types of particles populating the coma of 67P. These particles can be separated into two families: compact particles (ranging in size from 0.03 to 1 mm), which underwent processing within the solar nebula, and fluffy aggregates (ranging in size from 0.2 to 2.5 mm) of sub-micron grains, which might be a record of a primitive component, probably linked to interstellar dust (Fulle et al 2015). Some physical processes related to comets depend strongly on the size distribution of dust particles in their atmospheres, surfaces, and the first few meters below (Fulle et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Scattering Properties of Large Irregular Cosmic Dust Particles at Visible Wavelengths

Escobar-Cerezo

Palmer

Muñoz

et al. 2017

ApJ

Self Cite

View full text Add to dashboard Cite

The effect of internal inhomogeneities and surface roughness on the scattering behavior of large cosmic dust particles is studied by comparing model simulations with laboratory measurements. The present work shows the results of an attempt to model a dust sample measured in the laboratory with simulations performed by a ray-optics model code. We consider this dust sample as a good analogue for interplanetary and interstellar dust as it shares its refractive index with known materials in these media. Several sensitivity tests have been performed for both structural cases (internal inclusions and surface roughness). Three different samples have been selected to mimic inclusion/coating inhomogeneities: two measured scattering matrices of hematite and white clay, and a simulated matrix for water ice. These three matrices are selected to cover a wide range of imaginary refractive indices. The selection of these materials also seeks to study astrophysical environments of interest such as Mars, where hematite and clays have been detected, and comets. Based on the results of the sensitivity tests shown in this work, we perform calculations for a size distribution of a silicate-type host particle model with inclusions and surface roughness to reproduce the experimental measurements of a dust sample. The model fits the measurements quite well, proving that surface roughness and internal structure play a role in the scattering pattern of irregular cosmic dust particles.

show abstract

Section: Introductionmentioning

confidence: 99%

Scattering Properties of Large Irregular Cosmic Dust Particles at Visible Wavelengths

Escobar-Cerezo

Palmer

Muñoz

et al. 2017

ApJ

Self Cite

View full text Add to dashboard Cite

show abstract

“…up to hundreds of detections in tens of seconds, and correspond to fluffy low-density (< 1 kg m −3 ) aggregates (Fulle et al 2015). The GDS-only detections are explained as portions of parent particles fragmented by the internal electrostatic tension caused by charging from the secondary electron flux from Rosetta (Fulle et al 2015). IS-only and GDS+IS detections are of compact particles with density of (1.9 ± 1.1) x 10 3 kg m −3 (Rotundi et al 2015), the only difference being the particle cross-section (i.e.…”

Section: Observationsmentioning

confidence: 99%

“…In particular, the ratio between compact particles and fluffy parents jumps from about 3 in the bound orbit phase to ≥ 10 for the period under study. In addition, 67P's coma brightness contribution from fluffy aggregates is less than 15 per cent (Fulle et al 2015). This is the reason why we focus our attention on compact particles, i.e.…”

Section: Observationsmentioning

confidence: 99%

“…GIADA could do better for a two reasons: 1) due to Rosetta's trajectory, essentially matched to that of the comet, long-term monitoring of the comet's activity was possible for the very first time; 2) for the first time a dust instrument measured mass, speed, crosssection and the exact detection time/position of individual dust particles simultaneously. GIADA was able to (1) characterize 67P's dust environment (Fulle et al 2015); (2) monitor the dust loss rate and the particle mass distribution at the surface of the sunlit nucleus; (3) monitor the dust mass distribution of 67P as it evolved with time (Rotundi et al 2015;Fulle et al 2016); and (4) in the case of dust detected along closely-bound orbits, provide a hint of the region of the nucleus from where the dust originated (Della Corte et al 2015). Even when 67P's coma dust structures are studied by in situ measurements combined with ground-based observations, understanding their formation mechanisms and connecting them to specific active areas on the nucleus is a very challenging process.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

67P/C-G inner coma dust properties from 2.2 au inbound to 2.0 au outbound to the Sun

Corte

Rotundi

Fulle

et al. 2016

Mon. Not. R. Astron. Soc.

Self Cite

View full text Add to dashboard Cite

GIADA (Grain Impact Analyzer and Dust Accumulator) on-board the Rosetta space probe is designed to measure the momentum, mass and speed of individual dust particles escaping the nucleus of comet 67P/Churyumov-Gerasimenko (hereafter 67P). From August 2014 to June 2016 Rosetta escorted comet 67P during its journey around the Sun. Here we focus on GIADA data taken between 2015 January and 2016 February which included 67P's perihelion passage. To better understand cometary activity and more specifically the presence of dust structures in cometary comae, we mapped the spatial distribution of dust density in 67P's coma. In this manner we could track the evolution of high density regions of coma dust and their connections with nucleus illumination conditions, namely tracking 67P's seasons. We also studied the link between dust particle speeds and their masses with respect to heliocentric distance, i.e. the level of cometary activity. This allowed us to derive a global and a local correlation of the dust particles' speed distribution with respect to the H 2 O production rate.

show abstract

“…GIADA detected the first dust particle on 1 August 2014 and since then it monitored the evolution of the 67P dust environment Fulle et al, 2015Fulle et al, , 2016aFulle et al, , 2016bGrün et al, 2016;Rotundi et al, 2015). During the mission, we monitored the functional parameters of the sensors, evaluating their health status and checking their performance over time and in different environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

GIADA performance during Rosetta mission scientific operations at comet 67P

Sordini

Corte

Rotundi

et al. 2018

Advances in Space Research

Self Cite

View full text Add to dashboard Cite

oro.open.ac.uk GIADA performance during Rosetta mission scientific operations at comet 67P AbstractThe Grain Impact Analyser and Dust Accumulator (GIADA) instrument onboard Rosetta studied the dust environment of comet 67P/Churyumov-Gerasimenko from 3.7 au inbound, through perihelion, to 3.8 au outbound, measuring the dust flow and the dynamic properties of individual particles. GIADA is composed of three subsystems: 1) Grain Detection System (GDS); 2) Impact Sensor (IS); and 3) Micro-Balances System (MBS). Monitoring the subsystems' performance during operations is an important element for the correct calibration of scientific measurements. In this paper, we analyse the GIADA inflight calibration data obtained by internal calibration devices for the three subsystems during the period from 1 August 2014 to 31 October 2015. The calibration data testify a nominal behaviour of the instrument during these fifteen months of mission; the only exception is a minor loss of sensitivity for one of the two GDS receivers, attributed to dust contamination.

show abstract

Density and Charge of Pristine Fluffy Particles From Comet 67p/Churyumov–gerasimenko

Cited by 140 publications

References 25 publications

Scattering Properties of Large Irregular Cosmic Dust Particles at Visible Wavelengths

Scattering Properties of Large Irregular Cosmic Dust Particles at Visible Wavelengths

67P/C-G inner coma dust properties from 2.2 au inbound to 2.0 au outbound to the Sun

GIADA performance during Rosetta mission scientific operations at comet 67P

Contact Info

Product

Resources

About