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The supernova remnant J0450.4-7050 possesses a jets-shaped point-symmetric morphology

Noam Soker

TL;DR

The study identifies a jet-shaped, point-symmetric morphology in the Large Magellanic Cloud core-collapse supernova remnant J0450.4-7050 using new high-resolution, multiwavelength images. It interprets this structure as evidence for at least three jet pairs that shaped the explosion under the jittering-jet explosion mechanism (JJEM), with inner ejecta features such as rings and nozzles supporting jet origin and Pair 2 being the most energetic. The observed morphology is incompatible with the neutrino-driven explosion mechanism, supported by an $E_{ m exp} \simeq 8.6 \times 10^{51} \mathrm{erg}$ estimate, exceeding neutrino-driven capacities. The study thus strengthens JJEM as the primary CCSN mechanism and highlights point-symmetric morphologies as a diagnostic for jet-driven explosions, suggesting broader surveys of CCSNRs.

Abstract

By examining recently published images in different wavelengths, I identify a point-symmetric morphology in the Large Magellanic Cloud core-collapse supernova (CCSN) remnant (CCSNR) J0450.4-7050 (SNR 0450-70.9; nicknamed Veliki), which I attribute to at least three pairs of energetic jets that participated in the explosion of the progenitor in the framework of the jittering jets explosion mechanism (JJEM). Two pairs of ears, a pair of blowouts in the north and south along the long axis of this SNR, and a pair of dents compose the point symmetric morphology. The fact that the symmetry axes of two pairs include pairs of opposite structural features in the inner ejecta implies that the shaping is by jets and not due to an interaction with an ambient material. While the JJEM predicts such morphologies, the competing neutrino-driven mechanism cannot account for point-symmetric morphologies. This study provides strong support for the claim that the JJEM is the primary CCSN explosion mechanism.

The supernova remnant J0450.4-7050 possesses a jets-shaped point-symmetric morphology

TL;DR

The study identifies a jet-shaped, point-symmetric morphology in the Large Magellanic Cloud core-collapse supernova remnant J0450.4-7050 using new high-resolution, multiwavelength images. It interprets this structure as evidence for at least three jet pairs that shaped the explosion under the jittering-jet explosion mechanism (JJEM), with inner ejecta features such as rings and nozzles supporting jet origin and Pair 2 being the most energetic. The observed morphology is incompatible with the neutrino-driven explosion mechanism, supported by an estimate, exceeding neutrino-driven capacities. The study thus strengthens JJEM as the primary CCSN mechanism and highlights point-symmetric morphologies as a diagnostic for jet-driven explosions, suggesting broader surveys of CCSNRs.

Abstract

By examining recently published images in different wavelengths, I identify a point-symmetric morphology in the Large Magellanic Cloud core-collapse supernova (CCSN) remnant (CCSNR) J0450.4-7050 (SNR 0450-70.9; nicknamed Veliki), which I attribute to at least three pairs of energetic jets that participated in the explosion of the progenitor in the framework of the jittering jets explosion mechanism (JJEM). Two pairs of ears, a pair of blowouts in the north and south along the long axis of this SNR, and a pair of dents compose the point symmetric morphology. The fact that the symmetry axes of two pairs include pairs of opposite structural features in the inner ejecta implies that the shaping is by jets and not due to an interaction with an ambient material. While the JJEM predicts such morphologies, the competing neutrino-driven mechanism cannot account for point-symmetric morphologies. This study provides strong support for the claim that the JJEM is the primary CCSN explosion mechanism.
Paper Structure (4 sections, 3 figures)

This paper contains 4 sections, 3 figures.

Table of Contents

  1. Introduction
  2. The method
  3. The symmetry axes of SNR J0450.4-7050
  4. Summary

Figures (3)

  • Figure 1: A five-color image of SNR J0450.4-7050 adapted from Smeatonetal2025SerAJ. Red: H$\alpha$; Green: 1.3 GHz MeerKAT radio; blue: XMM-Newton $0.3-1{~\rm keV}$ X-ray; yellow: [Oiii]; cyan: $250 \mu m$ Herschel IR. I added the labeling of the morphological features. The kernel is the entire bright structure inside the main SNR shell.
  • Figure 2: Images of SNR J0450.4-7050 in three lines as indicated; adapted from Smeatonetal2025SerAJ. Panel (a) combines the other three panels. All images are linearly scaled. I added the labeling and the lines. The three double-sided arrows mark my suggestion for the axes of three pairs of energetic jets. The line connects the two dents (see Figure \ref{['Fig:First']}). The four lines intersect at their centers. In all panels the point-symmetric wind-rose is of the same size.
  • Figure 3: MeerKAT 1.3 GHz image of SNR J0450.4-7050 adapted from Smeatonetal2025SerAJ. The image is linearly scaled. I copied the point-symmetric wind-rose from Figure \ref{['Fig:4panels']}.