Discovery of Double-ring Structure in the Supernova Remnant N103B: Evidence for Bipolar Winds from a Type Ia Supernova Progenitor

Abstract The geometric structure of supernova remnants (SNR) provides a clue to unveiling the pre-explosion evolution their progenitors. Here we present an X-ray study N103B (0509–68.7), Type Ia SNR in Large Magellanic Cloud, that is known be interacting with dense circumstellar matter (CSM). Applying our novel method for feature extraction deep Chandra observations, have successfully resolved CSM, Fe-rich ejecta, and intermediate-mass element (IME) ejecta components, revealed each spatial distributions. Remarkably, IME component exhibits double-ring structure, implying expands into hourglass-shape cavity thus forms bipolar bubbles ejecta. This interpretation supported by more quantitative spectroscopy reveals clear bimodality distribution ionization state These observational results can naturally explained if progenitor binary system had formed CSM torus on orbital plane prior explosion, providing further evidence originates from single-degenerate progenitor.