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### Could it be possible to detect planets from stars that went supernova through the resulting nebula shape?

The escape speed of a big planet like Jupiter is about 60 km/s. The speed of the ejecta from a supernova explosion is something like $10^4$ km/s. i.e. Jupiter would have little discernable ...
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### Supernova remnant spectral lines

In addition to AtomDB, another useful resource is the x-ray data booklet provided by LBNL. Specifically, this table has some common x-ray emission lines. My recommendation would be to fit the spectrum ...
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