Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/26464
DC Field | Value | Language |
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dc.contributor.author | Merouane, Sihane | en_US |
dc.contributor.author | Zaprudin, Boris | en_US |
dc.contributor.author | Stenzel, Oliver | en_US |
dc.contributor.author | Langevin, Yves | en_US |
dc.contributor.author | Altobelli, Nicolas | en_US |
dc.contributor.author | DELLA CORTE, VINCENZO | en_US |
dc.contributor.author | Fischer, Henning | en_US |
dc.contributor.author | FULLE, Marco | en_US |
dc.contributor.author | Hornung, Klaus | en_US |
dc.contributor.author | Silén, Johan | en_US |
dc.contributor.author | Ligier, Nicolas | en_US |
dc.contributor.author | Rotundi, Alessandra | en_US |
dc.contributor.author | Ryno, Jouni | en_US |
dc.contributor.author | Schulz, Rita | en_US |
dc.contributor.author | Hilchenbach, Martin | en_US |
dc.contributor.author | Kissel, Jochen | en_US |
dc.contributor.author | Cosima Team | en_US |
dc.date.accessioned | 2020-07-16T09:53:00Z | - |
dc.date.available | 2020-07-16T09:53:00Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26464 | - |
dc.description.abstract | Context. The COmetary Secondary Ion Mass Analyzer (COSIMA) on board Rosetta is dedicated to the collection and compositional analysis of the dust particles in the coma of 67P/Churyumov-Gerasimenko (67P). <BR /> Aims: Investigation of the physical properties of the dust particles collected along the comet trajectory around the Sun starting at a heliocentric distance of 3.5 AU. <BR /> Methods: The flux, size distribution, and morphology of the dust particles collected in the vicinity of the nucleus of comet 67P were measured with a daily to weekly time resolution. <BR /> Results: The particles collected by COSIMA can be classified according to their morphology into two main types: compact particles and porous aggregates. In low-resolution images, the porous material appears similar to the chondritic-porous interplanetary dust particles collected in Earth's stratosphere in terms of texture. We show that this porous material represents 75% in volume and 50% in number of the large dust particles collected by COSIMA. Compact particles have typical sizes from a few tens of microns to a few hundreds of microns, while porous aggregates can be as large as a millimeter. The particles are not collected as a continuous flow but appear in bursts. This could be due to limited time resolution and/or fragmentation either in the collection funnel or few meters away from the spacecraft. The average collection rate of dust particles as a function of nucleo-centric distance shows that, at high phase angle, the dust flux follows a 1/d<SUP>2</SUP><SUB>comet</SUB> law, excluding fragmentation of the dust particles along their journey to the spacecraft. At low phase angle, the dust flux is much more dispersed compared to the 1/d<SUP>2</SUP><SUB>comet</SUB> law but cannot be explained by fragmentation of the particles along their trajectory since their velocity, indirectly deduced from the COSIMA data, does not support such a phenomenon. The cumulative size distribution of particles larger than 150 μm follows a power law close to r<SUP>- 0.8 ± 0.1</SUP>, confirming measurements made by another Rosetta dust instrument Grain Impact Analyser and Dust Accumulator (GIADA). The cumulative size distribution of particles between 30 μm and 150 μm has a power index of -1.9 ± 0.3. The excess of dust in the 10-100 μm range in comparison to the 100 μm-1 mm range together with no evidence for fragmentation in the inner coma, implies that these particles could have been released or fragmented at the nucleus right after lift-off of larger particles. Below 30 μm, particles exhibit a flat size distribution. We interprete this knee in the size distribution at small sizes as the consequence of strong binding forces between the sub-constitutents. For aggregates smaller than 30 μm, forces stronger than Van-der-Waals forces would be needed to break them apart. | en_US |
dc.language.iso | eng | en_US |
dc.title | Dust particle flux and size distribution in the coma of 67P/Churyumov-Gerasimenko measured in situ by the COSIMA instrument on board Rosetta | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1051/0004-6361/201527958 | en_US |
dc.identifier.scopus | 2-s2.0-85002674988 | en_US |
dc.identifier.isi | 000390797900019 | en_US |
dc.identifier.url | https://www.aanda.org/articles/aa/abs/2016/12/aa27958-15/aa27958-15.html | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 596 | en_US |
dc.relation.firstpage | A87 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 16 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | FRA | en_US |
dc.contributor.country | DEU | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | ASTRONOMY & ASTROPHYSICS | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016A&A...596A..87M | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
item.languageiso639-1 | en | - |
item.openairetype | Article | - |
item.cerifentitytype | Publications | - |
crisitem.journal.journalissn | 0004-6361 | - |
crisitem.journal.ance | E016240 | - |
crisitem.author.dept | O.A. Capodimonte | - |
crisitem.author.dept | O.A. Trieste | - |
crisitem.author.orcid | 0000-0001-6461-5803 | - |
crisitem.author.orcid | 0000-0001-8435-5287 | - |
crisitem.author.orcid | 0000-0001-5467-157X | - |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
---|---|---|---|---|
aa27958-15.pdf | Pdf editoriale | 3.08 MB | Adobe PDF | View/Open |
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