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dc.contributor.authorMann, Ingrid
dc.date.accessioned2018-09-24T07:07:26Z
dc.date.available2018-09-24T07:07:26Z
dc.date.issued2017-05-29
dc.description.abstractComets, comet-like objects and their fragments are the most plausible source for the dust in both the inner heliosphere and planetary debris discs around other stars. The smallest size of dust particles in debris discs is not known and recent observational results suggest that the size distribution of the dust extends down to sizes of a few nanometres or a few tens of nanometres. In the Solar System, electric field measurements from spacecraft observe events that are explained with high-velocity impacts of nanometre-sized dust. In some planetary debris discs an observed mid- to near-infrared emission supposedly results from hot dust located in the vicinity of the star. And the observed emission is characteristic of dust of sizes a few tens of nanometres. Rosetta observations, on the other hand, provide little information on the presence of nanodust near comet 67P/Churyumov–Gerasimenko. This article describes why this is not in contradiction to the observations of nanodust in the heliosphere and in planetary debris discs. The direct ejection of nanodust from the nucleus of the comet would not contribute significantly to the observed nanodust fluxes. We discuss a scenario that nanodust forms in the interplanetary dust cloud through the high-velocity collision process in the interplanetary medium for which the production rates are highest near the Sun. Likewise, fragmentation by collisions occurs near the star in planetary debris discs. The collisional fragmentation process in the inner Solar System occurs at similar velocities to those of the collisional evolution in the interstellar medium. A question for future studies is whether there is a common magic size of the smallest collision fragments and what determines this size.en_US
dc.descriptionThis is the accepted manuscript version of the following article: Mann, I. (2017). Comets as a possible source of nanodust in the Solar System cloud and in planetary debris discs. <i>Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences</i>, 375(2097). https://doi.org/10.1098/rsta.2016.0254, first published in <i>Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences</i>. The final authenticated version is available online at: <a href=https://doi.org/10.1098/rsta.2016.0254> https://doi.org/10.1098/rsta.2016.0254</a>.en_US
dc.identifier.citationMann, I. (2017). Comets as a possible source of nanodust in the Solar System cloud and in planetary debris discs. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 375(2097). https://doi.org/10.1098/rsta.2016.0254en_US
dc.identifier.cristinIDFRIDAID 1490084
dc.identifier.doi10.1098/rsta.2016.0254
dc.identifier.issn1364-503X
dc.identifier.issn1471-2962
dc.identifier.urihttps://hdl.handle.net/10037/13852
dc.language.isoengen_US
dc.publisherThe Royal Societyen_US
dc.relation.journalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438en_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Astrophysics, astronomy: 438en_US
dc.subjectcometsen_US
dc.subjectinterplanetary dusten_US
dc.subjectheliosphereen_US
dc.subjectplanetary debris discsen_US
dc.titleComets as a possible source of nanodust in the Solar System cloud and in planetary debris discsen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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