gary
08-07-2021, 05:28 PM
Supernovae are classified by their spectra.
If a spectrum contains hydrogen, it is classified as Type II, otherwise as Type I.
This also betrays the physical mechanism that caused the star to blow apart.
Astronomers now believe that both supernova 2018zd and the supernova
that created the Crab Nebula 1000 years ago were both of elusive Type III.
Article here :-
https://www.space.com/new-supernova-type-discovery
Paper "The electron-capture origin of supernova 2018zd" by Hiramatsu et. al. :-
https://arxiv.org/pdf/2011.02176.pdf
If a spectrum contains hydrogen, it is classified as Type II, otherwise as Type I.
This also betrays the physical mechanism that caused the star to blow apart.
Astronomers now believe that both supernova 2018zd and the supernova
that created the Crab Nebula 1000 years ago were both of elusive Type III.
Article here :-
https://www.space.com/new-supernova-type-discovery
Paper "The electron-capture origin of supernova 2018zd" by Hiramatsu et. al. :-
https://arxiv.org/pdf/2011.02176.pdf