Identifying subclasses of young type Ia supernova remnants by X-ray observations

Satoru Katsuda, Koji Mori, Keiichi Maeda, Masaomi Tanaka, Katsuji Koyama, Hiroshi Tsunemi, Hiroshi Nakajima, Yoshitomo Maeda, Masanobu Ozaki, Robert Petre

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We have analyzed XMM-Newton, Chandra, and Suzaku observations of three young Type Ia supernova remnants (SNRs), i.e., Kepler's SNR, Tycho's SNR, and SNR 0509-67.5 in the LMC, to investigate the properties of both the SN ejecta and the circumstellar medium (CSM). By simply comparing the X-ray spectra, we find that line intensity ratios of iron-group elements (IGE) to intermediate-mass elements (IME) for Kepler's SNR and SNR 0509-67.5 are much higher than those for Tycho's SNR. We therefore argue that Kepler is the product of an overluminous Type Ia SN. This inference is supported by our spectral modeling, which reveals the IGE and IME masses respectively to be 0.95 (0.58-1.29) M and 0.12 (0.07-0.31) M (Kepler's SNR), 0.75 (0.6-1.26) M and 0.34 (0.09-0.42) M (SNR 0509-67.5), and 0.35 (0.2-0.9) M and 0.70 (0.42-0.82) M (Tycho's SNR). On the other hand, there are a number of dense, N-rich CSM knots in Kepler's SNR, which were found by optical observations and are now confirmed by our X-ray observations. Their optical proper motions as well as X-ray measured ionization states indicate that they were located a few pc away from the progenitor system at the SN explosion. Therefore, we argue that Kepler's SN was an overluminous event that started to interact with massive CSM a few hundred years after the explosion, which supports the possible link between overluminous SNe and the so-called “Ia-CSM” SNe.

Original languageEnglish
Title of host publication14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings
EditorsMassimo Bianchi, Robert T Jantzen, Remo Ruffini, Remo Ruffini
PublisherWorld Scientific Publishing Co. Pte Ltd
Pages1915-1921
Number of pages7
ISBN (Electronic)9789813226593
DOIs
Publication statusPublished - 2018
Externally publishedYes
Event14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Rome, Italy
Duration: 2015 Jul 122015 Jul 18

Publication series

Name14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings

Other

Other14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories
CountryItaly
CityRome
Period15/7/1215/7/18

Keywords

  • Supernova remnants
  • Supernovae
  • X-rays

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics

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