They Came From the Deep in the Supernova: The Origin of TiC and Metal Subgrains in Presolar Graphite Grains

Details They Came From the Deep in the Supernova: The Origin of TiC and Metal Subgrains in Presolar Graphite Grains They Came From the Deep in the Supernova: The Origin of TiC and Metal Subgrains in Presolar Graphite Grains

2006-06-27

arxiv.org/abs/astro-ph/0606673v1

Astrophys.J.647:L37-L40,2006

Astronomy and Astrophysics

Astrophysics

8 pages, 2 tables, 2 figures; Astrophysical Journal, in press

Scientific paper

10.1086/507181

A new formation scenario for TiC and Fe,Ni-metal inclusions in presolar graphite grains of supernova origin is described. The mineralogy and chemistry require condensation of (Fe,Ni)-titanides from Fe, Ni, and Ti-rich gaseous ejecta, subsequent carburization to make TiC and metal, and encapsulation into graphite. Titanides only condense if Si is depleted relative to heavier mass elements, which requires alpha-rich freeze-out and a deep mass-cut for the supernova ejecta. This Si-poor core material must remain unmixed with other supernova zones until the titanides condensed. This can be accomplished by transport of core ejecta in bipolar jets through the major expanding supernova zone ejecta. If the jets stall in regions dominated by C-rich ejecta such as C-He zone where graphite condenses, thermochemically favored in situ carburization of the titanides - either before or during encapsulation into condensing graphite - leads to a TiC and metal composite. This scenario agrees with theoretical models and observations of asymmetric core collapse in supernovae that are associated with bipolar jets loaded with iron-peak elements.

Affiliated with

Also associated with

No associations

Rating

They Came From the Deep in the Supernova: The Origin of TiC and Metal Subgrains in Presolar Graphite Grains 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 They Came From the Deep in the Supernova: The Origin of TiC and Metal Subgrains in Presolar Graphite Grains, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and They Came From the Deep in the Supernova: The Origin of TiC and Metal Subgrains in Presolar Graphite Grains will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-534662