Ages of Type Ia Supernovae Over Cosmic Time
Michael J. Childress, Christian Wolf, and H. Jabran Zahid

TL;DR
This paper models the ages of Type Ia supernovae over cosmic time by combining galaxy assembly histories with delay time distributions, revealing how progenitor ages depend on galaxy type and evolve with redshift.
Contribution
It introduces empirical models linking galaxy evolution with SN Ia progenitor ages, explaining observed SN Ia rate evolution and host galaxy properties.
Findings
SN Ia ages peak at DTD in star-forming galaxies
Passive galaxies' SN Ia ages peak at quenching epoch
Low-mass galaxies are actively star-forming, massive ones passive
Abstract
We derive empirical models for galaxy mass assembly histories, and convolve these with theoretical delay time distribution (DTD) models for Type Ia supernovae (SNe Ia) to derive the distribution of progenitor ages for all SNe Ia occurring at a given epoch of cosmic time. In actively star-forming galaxies, the progression of the star formation rate is shallower than a SN Ia DTD, so mean SN Ia ages peak at the DTD peak in all star-forming galaxies at all epochs of cosmic history. In passive galaxies which have ceased star formation through some quenching process, the SN Ia age distribution peaks at the quenching epoch, which in passive galaxies evolves in redshift to track the past epoch of major star formation. Our models reproduce the SN Ia rate evolution in redshift, the relationship between SN Ia stretch and host mass, and the distribution of SN Ia host masses in a manner…
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