[Previous] | [Session 13] | [Next]

[13.07] Ion Implantation in SiC X Grains Due to Supernova Reverse Shocks

E. A.-N. Deneault, D.D. Clayton (Clemson University), A. Heger (University of Chicago)

We present a novel mechanism by which the isotopic compositions of SiC X grains are altered via interaction with reverse shocks in Type II supernovae. Three epochs of reverse shocks are important to the condensation and subsequent history of these grains. Using a 1-D model of a 25M_\odot supernova, we show that the first reverse shock creates a dense shell of Si and C near 10⁶s, which facilitates the condensation of SiC. Subsequent reverse shocks from the circumstellar medium and the ISM, which occur near 10⁸s and 10¹⁰s, propel the grain rapidly forward through decelerated gas of varying isotopic composition, causing implantation and sputtering by the overlying material.

[Previous] | [Session 13] | [Next]

Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.