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| Autori principali: | , |
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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2509.23547 |
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| _version_ | 1866911181933903872 |
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| author | Yu, Huan Fang, Jun |
| author_facet | Yu, Huan Fang, Jun |
| contents | The origin of ear-like structures with two opposite lobes extending from the shell of supernova remnants (SNRs) remains a subject of active debate, with proposed mechanisms ranging from jet-driven explosions to interactions with bipolar circumstellar media. We present a novel investigation using Particle-in-Cell (PIC) simulations to examine the dynamics of a spherical ejecta in magnetized media, revealing a different formation mechanism for these structures. Our results demonstrate that particle acceleration is significantly enhanced along the magnetic-field direction, producing substantial modifications to shock morphology. These effects naturally generate elongated protrusions bearing a remarkable similarity to the observed SNR ear structures. This magnetic alignment scenario represents a distinct mechanism from the existing jet-based and circumstellar interaction models. Our findings suggest that magnetic field orientation may serve as a crucial diagnostic for distinguishing between different ear formation mechanisms in SNRs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_23547 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Particle Acceleration along Magnetic Fields as the Origin of Ear-like Structures in Supernova Remnants Yu, Huan Fang, Jun High Energy Astrophysical Phenomena The origin of ear-like structures with two opposite lobes extending from the shell of supernova remnants (SNRs) remains a subject of active debate, with proposed mechanisms ranging from jet-driven explosions to interactions with bipolar circumstellar media. We present a novel investigation using Particle-in-Cell (PIC) simulations to examine the dynamics of a spherical ejecta in magnetized media, revealing a different formation mechanism for these structures. Our results demonstrate that particle acceleration is significantly enhanced along the magnetic-field direction, producing substantial modifications to shock morphology. These effects naturally generate elongated protrusions bearing a remarkable similarity to the observed SNR ear structures. This magnetic alignment scenario represents a distinct mechanism from the existing jet-based and circumstellar interaction models. Our findings suggest that magnetic field orientation may serve as a crucial diagnostic for distinguishing between different ear formation mechanisms in SNRs. |
| title | Particle Acceleration along Magnetic Fields as the Origin of Ear-like Structures in Supernova Remnants |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2509.23547 |