Bulbous tracks arising from hypervelocity capture in aerogel

Trigo-Rodriguez, Josep M. and Dominguez, Gerardo and Burchell, Mark J. and Horz, Friedrich and Llorca, Jordi (2008) Bulbous tracks arising from hypervelocity capture in aerogel. Meteoritics & Planetary Science, 43 (1-2). pp. 75-86. ISSN 1086-9379. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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The capture of 81P/Wild 2 cometary particles in aerogel with a well-defined impact velocity (6.1 km s(-1)) has provided a wealth of data concerning the composition of Jupiter-family comets. To interpret this data we must understand the capture processes in the aerogel. A major category of tracks are those with bulbous cavities lined with particle fragments. We present a new model to account for the production of these "turnip"-shaped impact cavities. The model uses a thermodynamic approach in order to account for the likely expansion of vapors from particles rich in volatile species. Volume measurements of some of the largest Stardust tracks analysed so far, together with theoretical considerations, indicate that for the majority of Stardust cometary aggregate particle impacts, fragmentation of relatively weak impactors (combined with radial expansion of the resulting subgrains) is the leading cause of bulbous track production, while volatile release of vapors played a secondary role.

Item Type: Article
Subjects: Q Science > QC Physics > QC807 Geophysics (for Applied Geophysics see TN269)
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Louise Dorman
Date Deposited: 09 Apr 1914 17:32
Last Modified: 30 Apr 2014 11:45
Resource URI: https://kar.kent.ac.uk/id/eprint/15270 (The current URI for this page, for reference purposes)
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