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Hi Ivan,
I've found various explanations for the type 1a process ... which is still not fully understood. One says that the decay of NiII, and higher Ni ions, results in heating the expanding shell to very high temperatures -> hence the very blue continuum of the SN remnant. Other sources say it is the decay of 56/27 Cobalt that is responsible.
Normally SN explosions destroy the progenitor star so it is unlikely there will be any core left to see, unlike PNs.
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