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Despite decades of intense efforts, many fundamental aspects of Type Iasupernova (SNe Ia) remain elusive. One of the major open questions is whetherthe mass of the exploding white dwarf (WD) is close to the Chandrasekhar limit.Here we report the detection of strong K-shell emission from stable Fe-peakelements in the Suzaku X-ray spectrum of the Type Ia supernova remnant (SNR) 3C397. The high Ni/Fe and Mn/Fe mass ratios (0.11-0.24 and 0.018-0.033,respectively) in the hot plasma component that dominates the K-shell emissionlines indicate a degree of neutronization in the SN ejecta which can only beachieved by electron captures in the dense cores of exploding WDs with anear-Chandrasekhar mass. This suggests a single-degenerate origin for 3C 397,since Chandrasekhar mass progenitors are expected naturally if the WD accretesmass slowly from a companion. Together with other results supporting thedouble-degenerate scenario, our work adds to the mounting evidence that bothprogenitor channels make a significant contribution to the SN Ia rate instar-forming galaxies.

A Chandrasekhar Mass Progenitor for the Type Ia Supernova Remnant 3C 397 from The Enhanced Abundances of Nickel and Manganese