From Rosetta to Museums: The very long journey of cometary dust particles within the zodiacal cloud

Anny Chantal Levasseur-Regourd 1
1 IMPEC - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Die Kometen- Mission Rosetta / Symposium am 12. Juli 2018 4/9 KOMMISSION FÜR ASTRO NOMIE und KOMMISSION FÜR GEOWI SSENSCHAFTEN in Kooperation mit dem NATURHISTORISCHEN MU SEUM WIEN From Rosetta to Museum s The very long journey of cometary dust particles within the zodiacal cloud Prof. Dr. Anny -Chantal Levasseur -Regourd Universität Sorbonne | LATMOS -Institut, Paris https://www.latmos.ipsl.fr/index.php/en/annuaire?id=3735 Anny -Chantal.Levasseur@aerov.jussieu.fr The Rosetta rendezvous mission has established that dust particles in the coma of comet 67P/Churyumov -Gerasimenko (thereafter 67P) are aggregates, with sizes mainly from tens to hundreds of micrometers. They present a hierarchical structure, are built up from a large number of subunits (at least down to tens of nanometers), and may be rather compact or quite fluffy. Rosetta has also provided evidence for the dominance of organic matter in such particles. Their porous structure and carbonaceous composition, in agreement with results tentatively inferred from other comets, are perfectly consistent with the results established for the nucleus of 67P. Cometary dust particles, once released from a cometary nucleus, are subjected to gravitational and non -gravitational forces, which scatter them along cometary dust tails and trails, and progressively inject them into the zodiacal cloud (also called interplanetary dust cloud), where they may slowly spiral inwards durin g tens of thousands of years, before finally falling into the Sun. It has been recently recognized that most of the interplanetary dust particles reaching the Earth’s environment originate from comets on orbits comparable to that of 67P. Some of these nu merous dust particles entering the Earth’s atmosphere may survive their impact, because of their relatively low velocities and their fluffy structure. They have indeed been collected during the last decades, within the stratosphere, as CP-IDPS (Chondritic Porous Interplanetary Dust particles), and from snow and ice of high -altitude sites in Antarctica, as UCAMMs (Ultra Carbonaceous Antarctica Micro Meteorites). They are presently carefully preserved and analyzed, as unique remnants of the early solar system
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Submitted on : Monday, July 30, 2018 - 9:09:47 PM
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Anny Chantal Levasseur-Regourd. From Rosetta to Museums: The very long journey of cometary dust particles within the zodiacal cloud. Symposium 2018: The Comet-Mission ROSETTA, Jul 2018, Venna, Austria. ⟨insu-01851789⟩

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