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Accueil > Séminaires > Séminaires passés > Séminaires de 2011 > Interplanetary Dust Particles (IDPs) - Sampling pristine early solar system matter from comets

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H. Busemann

Interplanetary Dust Particles (IDPs) - Sampling pristine early solar system matter from comets

Jeudi 16 Juin 2011 à 14h15

We aim for a better understanding of the formation of the solar system and its evolution from the initial protosolar cloud of dust and gas to the present system of planets, asteroids and comets. To this goal, we seek to identify the most primitive solar system matter available for laboratory examination , which might be most similar to the protosolar cloud material that accreted to form the first planetesimals.

Comparison of this most unaltered material, with that which has been more processed, will then help us to understand the processes that the extraterrestrial materials experienced. These happened prior to accretion, on the parent bodies, during transfer to Earth, or during collection.

In this talk I will summarize our efforts to better characterize IDPs, sub-mm sized particles collected by NASA in the upper atmosphere that are assumed to be mostly from comets. I will compare our results with recent examinations of comet Wild 2 "Stardust" and primitive meteorites. We present and discuss results obtained with various techniques including secondary ion and noble gas mass spectrometry, X-ray and Raman spectroscopy.