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Title: A Chandrasekhar mass progenitor for the Type Ia supernova remnant 3C 397 from the enhanced abundances of nickel and manganese

Despite decades of intense efforts, many fundamental aspects of Type Ia supernovae (SNe Ia) remain elusive. One of the major open questions is whether the mass of an exploding white dwarf (WD) is close to the Chandrasekhar limit. Here, we report the detection of strong K-shell emission from stable Fe-peak elements in the Suzaku X-ray spectrum of the Type Ia supernova remnant (SNR) 3C 397. 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 emission lines indicate a degree of neutronization in the supernova ejecta that can only be achieved by electron capture in the dense cores of exploding WDs with a near-Chandrasekhar mass. This suggests a single-degenerate origin for 3C 397, since Chandrasekhar mass progenitors are expected naturally if the WD accretes mass slowly from a companion. Altogether with other results supporting the double-degenerate scenario, our work adds to the mounting evidence that both progenitor channels make a significant contribution to the SN Ia rate in star-forming galaxies.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [3] ;  [5] ;  [9]
  1. NASA Goddard Space Flight Center, Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States); Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  2. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  3. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  4. Univ. Politecnica de Catalunya, Sant Cugat del Valles (Spain)
  5. NASA Goddard Space Flight Center, Greenbelt, MD (United States)
  6. Kyoto Univ., Kyoto (Japan); Univ. of Tokyo, Chiba (Japan)
  7. Univ. Kitashirakawa-oiwake-cho, Kyoto (Japan)
  8. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  9. Univ. Kitashirakawa-oiwake-cho, Kyoto (Japan); Osaka Univ., Osaka (Japan)
Publication Date:
OSTI Identifier:
1240422
Report Number(s):
LA-UR--14-29193
Journal ID: ISSN 2041-8213
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 801; Journal Issue: 2; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS atomic data; infrared: ISM; ISM: individual objects (3C 397, G41.1-03); ISM: supernova remnants; nuclear reactions; nucleosynthesis; abundances; X-rays: ISM