Constrain metallicity-dependent Type Ia supernova yields

Determine how metallicity-dependent Type Ia supernova yields can be observationally constrained and how those yields affect galactic chemical-evolution models.

Background

The review explains that the initial metallicity of a Type Ia supernova progenitor changes its neutron excess through the production of 22^{22}Ne, thereby modifying isotopic and elemental yields. Although systematic calculations have quantified these trends, the observational signatures of the metallicity dependence and its consequences for galactic chemical evolution remain unresolved.

References

It remains unclear how these metallicity-dependent yields can be observationally constrained and how they can affect GCE models.

— Supernova nucleosynthesis: a review  (2609.16584 - Zha et al., 15 Sep 2026) in Section 4.2, “Metallicity dependence”

This seems to be at odds with the observation that more luminous supernovae explode in younger, higher metallicity environments, and the reason for this discrepency is still not clear.

— Fast and furious -- High-velocity features of Ca and Si in the spectra of Type Ia supernovae  (2609.37719 - Bora et al., 29 Sep 2026) in Section 5.3, Consequence of progenitor and/or environment