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The asteroid-comet continuum from laboratory and space analyses of comet samples and micrometeorites

Published online by Cambridge University Press:  27 October 2016

Cécile Engrand ,
Jean Duprat ,
Noémie Bardin ,
Emmanuel Dartois ,
Hugues Leroux ,
Eric Quirico ,
Karim Benzerara ,
Laurent Remusat ,
Elena Dobrică  and
Lucie Delauche
...Show all authors
Cécile Engrand
Affiliation:
CSNSM, CNRS/IN2P3-Univ.Paris-Sud, Université Paris-Saclay, 91405 Orsay, France email: cecile.engrand@csnsm.in2p3.fr
Jean Duprat
Affiliation:
CSNSM, CNRS/IN2P3-Univ.Paris-Sud, Université Paris-Saclay, 91405 Orsay, France email: cecile.engrand@csnsm.in2p3.fr
Noémie Bardin
Affiliation:
CSNSM, CNRS/IN2P3-Univ.Paris-Sud, Université Paris-Saclay, 91405 Orsay, France email: cecile.engrand@csnsm.in2p3.fr
Emmanuel Dartois
Affiliation:
IAS, CNRS/INSU-Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay, France
Hugues Leroux
Affiliation:
UMET, CNRS/Univ. Lille1, 59655 Villeneuve d'Ascq, France
Eric Quirico
Affiliation:
IPAG, UMR 5274 CNRS/INSU-UJF-Grenoble 1, 38041 Grenoble, France
Karim Benzerara
Affiliation:
IMPMC, MNHN, Case postale 115, 4 place Jussieu, 75252 Paris Cedex 05, France
Laurent Remusat
Affiliation:
IMPMC, MNHN, Case postale 115, 4 place Jussieu, 75252 Paris Cedex 05, France
Elena Dobrică
Affiliation:
Dpt Earth Planetary Sciences MSC03 2040, Univ. New Mexico, Albuquerque NM 87131, USA
Lucie Delauche
Affiliation:
CSNSM, CNRS/IN2P3-Univ.Paris-Sud, Université Paris-Saclay, 91405 Orsay, France email: cecile.engrand@csnsm.in2p3.fr
John Bradley
Affiliation:
Hawai'i Inst. Geophysics & Planetology, University of Hawai'i, Honolulu, HI 96822, USA
Hope Ishii
Affiliation:
Hawai'i Inst. Geophysics & Planetology, University of Hawai'i, Honolulu, HI 96822, USA
Martin Hilchenbach
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany
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Abstract

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Comets are probably the best archives of the nascent solar system, 4.5 Gyr ago, and their compositions reveal crucial clues on the structure and dynamics of the early protoplanetary disk. Anhydrous minerals (olivine and pyroxene) have been identified in cometary dust for a few decades. Surprisingly, samples from comet Wild2 returned by the Stardust mission in 2006 also contain high temperature mineral assemblages like chondrules and refractory inclusions, which are typical components of primitive meteorites (carbonaceous chondrites - CCs). A few Stardust samples have also preserved some organic matter of comet Wild 2 that share some similarities with CCs. Interplanetary dust falling on Earth originate from comets and asteroids in proportions to be further constrained. These cosmic dust particles mostly show similarities with CCs, which in turn only represent a few percent of meteorites recovered on Earth. At least two (rare) families of cosmic dust particles have shown strong evidences for a cometary origin: the chondritic porous interplanetary dust particles (CP-IDPs) collected in the terrestrial stratosphere by NASA, and the ultracarbonaceous Antarctic Micrometeorites (UCAMMs) collected from polar snow and ice by French and Japanese teams. Analyses of dust particles from the Jupiter family comet 67P/Churyumov-Gerasimenko by the dust analyzers on Rosetta orbiter (COSIMA, GIADA, MIDAS) suggest a relationship to interplanetary dust/micrometeorites. A growing number of evidences highlights the existence of a continuum between asteroids and comets, already in the early history of the solar system.

Keywords

solar system: generalcomets: generalminor planetsasteroids
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29A: Astronomy in Focus , August 2015 , pp. 253 - 256
Copyright
Copyright © International Astronomical Union 2016 

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