Sulfur Molecule Chemistry in Supernova Ejecta Recorded by Silicon Carbide Stardust

Details Sulfur Molecule Chemistry in Supernova Ejecta Recorded by Silicon Carbide Stardust Sulfur Molecule Chemistry in Supernova Ejecta Recorded by Silicon Carbide Stardust

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...745l..26h&link_type=abstract

The Astrophysical Journal Letters, Volume 745, Issue 2, article id. L26 (2012).

Astronomy and Astrophysics

Astronomy

Circumstellar Matter, Molecular Processes, Nuclear Reactions, Nucleosynthesis, Abundances, Supernovae: General

Scientific paper

We studied about 3400 presolar silicon carbide (SiC) grains from the Murchison CM2 meteorite for C- and Si-isotopic compositions. Among these grains we identified 7 unusual or type C SiC (U/C) grains, characterized by isotopically heavy Si, and 36 supernova type X SiC grains, characterized by isotopically light Si. Selected U/C and X grains were also measured for S-, Mg-Al-, and Ca-Ti-isotopic compositions. We show that the U/C grains incorporated radioactive 44Ti, which is evidence that they formed in the ejecta of Type II supernova (SNII) explosions. Abundances of radioactive 26Al and 44Ti are compatible with those observed in X grains. U/C and X grains carry light S with enrichments in 32S of up to a factor of 2.7. The combination of heavy Si and light S observed in U/C grains is not consistent with abundance predictions of simple supernova models. The isotope data suggest preferential trapping of S from the innermost supernova zones, the production site of radioactive 44Ti, by the growing silicon carbide particles. A way to achieve this is by sulfur molecule chemistry in the still unmixed ejecta. This confirms model predictions of molecule formation in SNII ejecta and shows that sulfur molecule chemistry operates in the harsh and hot environments of stellar explosions.

Affiliated with

Also associated with

No associations

Rating

Sulfur Molecule Chemistry in Supernova Ejecta Recorded by Silicon Carbide Stardust does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Sulfur Molecule Chemistry in Supernova Ejecta Recorded by Silicon Carbide Stardust, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sulfur Molecule Chemistry in Supernova Ejecta Recorded by Silicon Carbide Stardust will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-889320