Analysis of XMM-Newton Observations of Supernova Remnant W49B and Clues to the Progenitor

Siegel, Jared; Dwarkadas, Vikram V.; Frank, Kari A.; Burrows, D. N.

doi:10.3847/1538-4357/abbfa9

Cited by 17 publications

(18 citation statements)

References 45 publications

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“…Our PTD models with central densities of 2.0-5. W49B has been proposed as a remnant from a DDT explosion, given its abundance pattern and the large observed IGE masses according to spatially resolved spectroscopic analysis (Zhou & Vink 2018;Siegel et al 2020). Figure 7 shows that W49B produces too-large IME/Fe ratios compared to Sgr A East, although the [Cr/Fe] and [Mn/Fe] values are similar to that of Sgr A East.…”

Section: Comparison With 3c397 and W49bmentioning

confidence: 95%

“…Some disputes remain on the explosion mechanisms of W49B (Sun & Chen 2020;Sato et al 2020a). One major dispute was from the inconsistent metal masses obtained in different studies, although the abundance ratios are more or less consistent (Sun & Chen 2020;Siegel et al 2020). When considering low IGE masses, the abundance pattern of W49B (except the high Mn abundance) might also be explained with a core-collapse SNR.…”

Section: Comparison With 3c397 and W49bmentioning

confidence: 99%

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Chemical Abundances in Sgr A East: Evidence for a Type Iax Supernova Remnant

Zhou

Leung

et al. 2021

ApJ

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Recent observations have shown a remarkable diversity of observational behaviors and explosion mechanisms in thermonuclear supernovae (SNe). An emerging class of peculiar thermonuclear SNe, called Type Iax, show photometric and spectroscopic behaviors distinct from normal Type Ia. Their origin remains highly controversial, but pure turbulent deflagration of white dwarfs (WDs) has been regarded as the leading formation theory. The large population of Type Iax indicates the existence of unidentified Galactic Type Iax supernova remnants (SNRs). We report evidence that SNR Sgr A East in the Galactic center resulted from a pure turbulent deflagration of a Chandrasekhar-mass carbon-oxygen WD, an explosion mechanism used for Type Iax SNe. Our X-ray spectroscopic study of Sgr A East using 3Ms of Chandra data shows a low ratio of intermediate-mass elements to Fe and large Mn/Fe and Ni/Fe ratios. This abundance pattern does not accord with the core-collapse or normal Type Ia models. Sgr A East is thus the first Galactic SNR for which a likely Type Iax origin has been proposed and is the nearest target for studying this peculiar class. We compared Sgr A East with the Fe-rich SNRs 3C397 and W49B, which also have high Mn and Cr abundances and were claimed to result from deflagration-to-detonation explosions of Chandrasekhar-mass WDs (although with disputes). Our study shows that they have distinct abundance patterns. The X-ray spectroscopic studies of thermonuclear SNRs provide observational evidence for the theories that there are diverse explosion channels and various metal outputs for Chandrasekharmass WDs.

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Section: Comparison With 3c397 and W49bmentioning

confidence: 95%

Section: Comparison With 3c397 and W49bmentioning

confidence: 99%

Chemical Abundances in Sgr A East: Evidence for a Type Iax Supernova Remnant

Zhou

Leung

et al. 2021

ApJ

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“…Type Ia SNR 3C397 (Yamaguchi et al 2015;Leung & Nomoto 2018) does not show enhanced abundance ratios of Ca to other elements Ca/X but has a large Fe/Ca ratio (Safi-Harb et al 2005;Ohshiro et al 2021). W49B has been proposed as a Type Ia SNR (still under debate) and has a smooth abundance ratio trend of S/Si ∼ Ar/Si ∼ Ca/Si and Ca/Fe  1 (Zhou & Vink 2018;Siegel et al 2020).…”

Section: Comparisons With Other Type Ia Snrsmentioning

confidence: 99%

“…Statistically, Type Ia SNRs are more symmetric than CC SNRs in X-ray morphology (Lopez et al 2011), either due to a more symmetric explosion process or a more uniform environment. Nevertheless, a few SNRs with asymmetric morphologies have also been proposed to have a Type Ia origin, e.g., SNR 3C397 (Chen et al 1999;Yamaguchi et al 2015;Leung & Nomoto 2018;Martínez-Rodríguez et al 2020;Ohshiro et al 2021) and SNR W49B (Zhou & Vink 2018;Siegel et al 2020). It would be of interest to explore if the aspherical morphology resulted from an intrinsically asymmetric Type Ia explosion or a nonuniform ambient medium.…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved X-Ray Study of Supernova Remnant G306.3–0.9 with Unusually High Calcium Abundance

Weng

Zhou

Chen

et al. 2022

ApJ

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G306.3–0.9 is an asymmetric Galactic supernova remnant (SNR), whose progenitor has been thought to be a Type Ia supernova (SN), but its high Ca abundance appears inconsistent with the Type Ia origin. Hoping to uncover the reason for its asymmetry and the origin of this SNR, we performed a spatially resolved X-ray spectroscopic analysis of XMM-Newton and Chandra observation data. We divided the SNR into 13 regions and analyzed the spectra using two-temperature models (0.2 keV + 1 keV). Compared to the southwestern regions, the northeastern regions have higher metal abundances and a lower gas density. This suggests that the asymmetric morphology results from the nonuniform ambient environment. We found that neither Type Ia nor core-collapse SN models can account for the abnormally high abundance ratios of Ar/Si, Ca/Si, or the shape of the abundance curve. A comparison with the Ca-rich transient models suggests that G306.3–0.9 is likely to be the first identified Galactic Ca-rich transient remnant, although the theoretical production of element S is lower. We also note that the conclusion for the SNR’s origin relies on the measured abundance ratios and existing nucleosynthesis models. Between two groups of Ca-rich transient explosion models, we prefer the He shell detonation for an accreting white dwarf, rather than the merger of a white dwarf and a neutron star.

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“…Nevertheless, a few SNRs with asymmetric morphologies have also been proposed to have a Type Ia origin, e.g. SNR 3C397 (Chen et al 1999;Yamaguchi et al 2015;Leung & Nomoto 2018;Martínez-Rodríguez et al 2020;Ohshiro et al 2021) and SNR W49B (Zhou & Vink 2018;Siegel et al 2020). It would be of interest to explore if the aspherical morphology resulted from an intrinsically asymmetric Type Ia explosion or a non-uniform ambient medium.…”

mentioning

confidence: 99%

Spatially Resolved X-ray Study of Supernova Remnant G306.3$-$0.9 with Unusually High Calcium Abundance

Weng,

Zhou,

Chen

et al. 2021

Preprint

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G306.3−0.9 is an asymmetric Galactic supernova remnant (SNR), whose progenitor has been thought to be a Type Ia supernova (SN), but its high Ca abundance appears inconsistent with the Type Ia origin. Hoping to uncover the reason for its asymmetry and the origin of this SNR, we performed a spatially resolved X-ray spectroscopic analysis of XMM-Newton and Chandra observation data. We divided the SNR into 13 regions and analyzed the spectra using two-temperature models (0.2 keV + 1 keV). Compared to the southwestern regions, the northeastern regions have higher metal abundances and a lower gas density. This suggests that the asymmetric morphology results from the non-uniform ambient environment. We found that neither Type Ia nor core-collapse SN models can account for the abnormally high abundance ratios of Ar/Si, Ca/Si, or the shape of the abundance curve. A comparison with the Ca-rich transient models suggests that G306.3−0.9 is likely to be the first identified Galactic "Ca-rich transient" remnant, although the theoretical production of element S is lower. We also note that the conclusion for the SNR's origin relies on the measured abundance ratios and existing nucleosynthesis models. Between two groups of Ca-rich transient explosion models, we prefer the He shell detonation for an accreting WD, rather than the merger of a white dwarf and a neutron star.

show abstract

Analysis of XMM-Newton Observations of Supernova Remnant W49B and Clues to the Progenitor

Cited by 17 publications

References 45 publications

Chemical Abundances in Sgr A East: Evidence for a Type Iax Supernova Remnant

Chemical Abundances in Sgr A East: Evidence for a Type Iax Supernova Remnant

Spatially Resolved X-Ray Study of Supernova Remnant G306.3–0.9 with Unusually High Calcium Abundance

Spatially Resolved X-ray Study of Supernova Remnant G306.3$-$0.9 with Unusually High Calcium Abundance

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