Is W49B a core-collapse supernova remnant?

Determine whether the Galactic supernova remnant W49B originated from a core-collapse supernova explosion rather than from an alternative progenitor such as a thermonuclear Type Ia event, by establishing its progenitor type and explosion mechanism.

Background

In discussing supernova remnants that exhibit circum-jet rings consistent with the jittering-jets explosion mechanism, the authors list several candidates. While noting ring-like structures in W49B, they explicitly point out that the classification of W49B as a core-collapse supernova remnant is not yet established.

Clarifying the progenitor type of W49B is important for interpreting its morphology and for assessing whether jet-driven processes associated with core-collapse events can account for its observed structures.