Persistent helium absorption detected in SN 2022an provides evidence for unburnt helium in the ejecta of a 91bg-like Type Ia supernova.
We performed PSF photometry with thedaophottask inIRAF(Tody 1986, 1993)
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Detection of persistent helium absorption in the 91bg-like type Ia Supernova 2022an
Persistent helium absorption detected in SN 2022an provides evidence for unburnt helium in the ejecta of a 91bg-like Type Ia supernova.