The radiosotope 44Ti is produced through α-rich freezeout and explosive helium burning in type Ia supernovae (SNe Ia). In this paper, we discuss how the detection of 44Ti, either through late-time light curves of SNe Ia, or directly via gamma rays, can uniquely constrain the origin of SNe Ia. In particular, building upon recent advances in the hydrodynamical simulation of helium-ignited double white dwarf binaries, we demonstrate that the detection of 44Ti in a nearby SN Ia or in a young galactic supernova remnant (SNR) can discriminate between the double-detonation and double-degenerate channels of sub-Chandrasekhar (sub-MCh) and near-Chandrasekhar (near-MCh) SNe Ia. In addition, we predict that the late-time light curves of calcium-rich transients are entirely dominated by 44Ti.
@article{arxiv.2210.10804,
title = {Using $^{44}$Ti Emission to Differentiate Between Thermonuclear Supernova Progenitors},
author = {Daniel Kosakowski and Mark Ivan Ugalino and Robert Fisher and Or Graur and Alexey Bobrick and Hagai B. Perets},
journal= {arXiv preprint arXiv:2210.10804},
year = {2022}
}