Ishii, H.A. and Bradley, J.P. and Dai, Z.R. and Chi, M.F. and Kearsley, A.T. and Burchell, M.J. and Browning, N.D. and Molster, F. (2008) Comparison of comet 81P/Wild 2 dust with interplanetary dust from comets. Science, 319 (5862). pp. 447-450. ISSN 0036-8075.
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The Stardust mission returned the first sample of a known outer solar system body, comet 81P/Wild 2, to Earth. The sample was expected to resemble chondritic porous interplanetary dust particles because many, and possibly all, such particles are derived from comets. Here, we report that the most abundant and most recognizable silicate materials in chondritic porous interplanetary dust particles appear to be absent from the returned sample, indicating that indigenous outer nebula material is probably rare in 81P/Wild 2. Instead, the sample resembles chondritic meteorites from the asteroid belt, composed mostly of inner solar nebula materials. This surprising finding emphasizes the petrogenetic continuum between comets and asteroids and elevates the astrophysical importance of stratospheric chondritic porous interplanetary dust particles as a precious source of the most cosmically primitive astromaterials.
|Subjects:||Q Science > Q Science (General)|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences|
|Depositing User:||Mark Burchell|
|Date Deposited:||10 Mar 2009 18:28|
|Last Modified:||14 Jan 2010 14:19|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/5062 (The current URI for this page, for reference purposes)|
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