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FältnamnIndikatorerMetadata
00005434naa a2200553 4500
001oai:DiVA.org:ri-6800
003SwePub
008160908s2015 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-68002 URI
0247 a https://doi.org/10.1038/nature141592 DOI
040 a (SwePub)ri
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Schulz, Ritau ESA European Space Agency, The Netherlands4 aut
2451 0a Comet 67P/Churyumov-Gerasimenko sheds dust coat accumulated over the past four years
264 c 2015-01-26
264 1b Springer Science and Business Media LLC,c 2015
338 a print2 rdacarrier
520 a Comets are composed of dust and frozen gases. The ices are mixed with the refractory material either as an icy conglomerate, or as an aggregate of pre-solar grains (grains that existed prior to the formation of the Solar System), mantled by an ice layer. The presence of water-ice grains in periodic comets is now well established. Modelling of infrared spectra obtained about ten kilometres from the nucleus of comet Hartley 2 suggests that larger dust particles are being physically decoupled from fine-grained water-ice particles that may be aggregates, which supports the icy-conglomerate model. It is known that comets build up crusts of dust that are subsequently shed as they approach perihelion. Micrometre-sized interplanetary dust particles collected in the Earth's stratosphere and certain micrometeorites are assumed to be of cometary origin. Here we report that grains collected from the Jupiter-family comet 67P/Churyumov-Gerasimenko come from a dusty crust that quenches the material outflow activity at the comet surface. The larger grains (exceeding 50 micrometres across) are fluffy (with porosity over 50 per cent), and many shattered when collected on the target plate, suggesting that they are agglomerates of entities in the size range of interplanetary dust particles. Their surfaces are generally rich in sodium, which explains the high sodium abundance in cometary meteoroids. The particles collected to date therefore probably represent parent material of interplanetary dust particles. This argues against comet dust being composed of a silicate core mantled by organic refractory material and then by a mixture of water-dominated ices. At its previous recurrence (orbital period 6.5 years), the comet's dust production doubled when it was between 2.7 and 2.5 astronomical units from the Sun, indicating that this was when the nucleus shed its mantle. Once the mantle is shed, unprocessed material starts to supply the developing coma, radically changing its dust component, which then also contains icy grains, as detected during encounters with other comets closer to the Sun.
7001 a Hilchenbach, Martinu Max Planck Institute for Solar System Research, Germany4 aut
7001 a Langevin, Yvesu CNRS, France; University of Paris-Sud, France4 aut
7001 a Kissel, Jochenu Max Planck Institute for Solar System Research, Germany4 aut
7001 a Silén, Johanu Finnish Meteorological Institute, Finland4 aut
7001 a Briois, Christelleu CNRS, France; University of Orléans, France4 aut
7001 a Engrand, Cécileu CNRS, France; University of Paris-Sud, France4 aut
7001 a Hornung, Klausu Universität der Bundeswehr, Germany4 aut
7001 a Baklouti, Doniau CNRS, France; University of Paris-Sud, France4 aut
7001 a Bardyn, Anaïsu CNRS, France; University of Orléans, France; LISA Laboratoire Interuniversitaire des Systèmes Atmosphériques, France4 aut
7001 a Cottin, Hervéu LISA Laboratoire Interuniversitaire des Systèmes Atmosphériques, France4 aut
7001 a Fischer, Henningu Max Planck Institute for Solar System Research, Germany4 aut
7001 a Fray, Nicolasu LISA Laboratoire Interuniversitaire des Systèmes Atmosphériques, France4 aut
7001 a Godard, Marieu CNRS, France; University of Paris-Sud, France4 aut
7001 a Lehto, Harry J.u University of Turku, Finland4 aut
7001 a Le Roy, Lénau University of Bern, Switzerland4 aut
7001 a Merouane, Sihaneu Max Planck Institute for Solar System Research, Germany4 aut
7001 a Orthous-Daunay, François Régisu CNRS, France; Université Grenoble Alpes, France4 aut
7001 a Paquette, John A.u Max Planck Institute for Solar System Research, Germany4 aut
7001 a Rynö, Jouniu Finnish Meteorological Institute, Finland4 aut
7001 a Siljeström, Sandrau RISE,SP – Sveriges Tekniska Forskningsinstitut / Funktionella material (KMf)4 aut0 (Swepub:ri)SandraSi@ri.se
7001 a Stenzel, Oliveru Max Planck Institute for Solar System Research, Germany4 aut
7001 a Thirkell, Laurentu CNRS, France; University of Orléans, France4 aut
7001 a Varmuza, Kurtu Vienna University of Technology, Austria4 aut
7001 a Zaprudin, Borisu University of Turku, Finland4 aut
7102 a ESA European Space Agency, The Netherlandsb Max Planck Institute for Solar System Research, Germany4 org
7730 t Natured : Springer Science and Business Media LLCg 518:7538, s. 216-218q 518:7538<216-218x 0028-0836x 1476-4687
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-6800
8564 8u https://doi.org/10.1038/nature14159

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