Citation
Trigo‐Rodríguez, J. M., Domínguez, G., Burchell, M. J., Hörz, F. and Llorca, J. (2008), Bulbous tracks arising from hypervelocity capture in aerogel. Meteoritics & Planetary Science, 43(1-2), 75-86.Publisher
The Meteoritical SocietyJournal
Meteoritics & Planetary ScienceAdditional Links
https://meteoritical.org/Abstract
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.Type
Articletext
Language
enISSN
1945-5100ae974a485f413a2113503eed53cd6c53
10.1111/j.1945-5100.2008.tb00610.x