Observational evidence for high neutronization in supernova remnants: implications for type ia supernova progenitors

Héctor Martínez-Rodríguez, Carles Badenes, Hiroya Yamaguchi, Eduardo Bravo, Francis Timmes, Broxton J. Miles, Dean M. Townsley, Anthony L. Piro, Hideyuki Mori, Brett Andrews, Sangwook Park

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The physical process whereby a carbon-oxygen white dwarf explodes as a Type Ia supernova (SN Ia) remains highly uncertain. The degree of neutronization in SN Ia ejecta holds clues to this process because it depends on the mass and the metallicity of the stellar progenitor, and on the thermodynamic history prior to the explosion. We report on a new method to determine ejecta neutronization using Ca and S lines in the X-ray spectra of Type Ia supernova remnants (SNRs). Applying this method to Suzaku data of Tycho, Kepler, 3C 397, and G337.2-0.7 in the Milky Way, and N103B in the Large Magellanic Cloud, we find that the neutronization of the ejecta in N103B is comparable to that of Tycho and Kepler, which suggests that progenitor metallicity is not the only source of neutronization in SNe Ia. We then use a grid of SN Ia explosion models to infer the metallicities of the stellar progenitors of our SNRs. The implied metallicities of 3C 397, G337.2-0.7, and N103B are major outliers compared to the local stellar metallicity distribution functions, indicating that progenitor metallicity can be ruled out as the origin of neutronization for these SNRs. Although the relationship between ejecta neutronization and equivalent progenitor metallicity is subject to uncertainties stemming from the 12C + 16O reaction rate, which affects the Ca/S mass ratio, our main results are not sensitive to these details.

Original languageEnglish (US)
Article number35
JournalAstrophysical Journal
Volume843
Issue number1
DOIs
StatePublished - Jul 1 2017

Fingerprint

supernova remnants
ejecta
metallicity
supernovae
explosion
outlier
explosions
reaction rate
thermodynamics
oxygen
Magellanic clouds
carbon
mass ratios
history
reaction kinetics
distribution functions
grids
histories
method
x rays

Keywords

  • atomic data
  • ISM: supernova remnants
  • nuclear reactions, nucleosynthesis, abundances
  • X-rays: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Observational evidence for high neutronization in supernova remnants : implications for type ia supernova progenitors. / Martínez-Rodríguez, Héctor; Badenes, Carles; Yamaguchi, Hiroya; Bravo, Eduardo; Timmes, Francis; Miles, Broxton J.; Townsley, Dean M.; Piro, Anthony L.; Mori, Hideyuki; Andrews, Brett; Park, Sangwook.

In: Astrophysical Journal, Vol. 843, No. 1, 35, 01.07.2017.

Research output: Contribution to journalArticle

Martínez-Rodríguez, H, Badenes, C, Yamaguchi, H, Bravo, E, Timmes, F, Miles, BJ, Townsley, DM, Piro, AL, Mori, H, Andrews, B & Park, S 2017, 'Observational evidence for high neutronization in supernova remnants: implications for type ia supernova progenitors', Astrophysical Journal, vol. 843, no. 1, 35. https://doi.org/10.3847/1538-4357/aa72f8
Martínez-Rodríguez, Héctor ; Badenes, Carles ; Yamaguchi, Hiroya ; Bravo, Eduardo ; Timmes, Francis ; Miles, Broxton J. ; Townsley, Dean M. ; Piro, Anthony L. ; Mori, Hideyuki ; Andrews, Brett ; Park, Sangwook. / Observational evidence for high neutronization in supernova remnants : implications for type ia supernova progenitors. In: Astrophysical Journal. 2017 ; Vol. 843, No. 1.
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