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arXiv 2108.01951astro-ph.SRastro-ph.HE
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亮蓝变星核坍缩超新星遗迹的模拟

Modeling the Remnants of Core-collapse Supernovae from Luminous Blue Variable stars

S. Ustamujic, S. Orlando, M. Miceli, F. Bocchino, M. Limongi, A. Chieffi, C. Trigilio, G. Umana, F. Bufano, A. Ingallinera, G. Peres

摘要:

LBV是大质量的演化恒星,遭受零星和暴力的质量损失事件。它们被认为是某些核心坍缩超新星的祖先,但由于缺乏直接证据,这一观点仍有争议。由于SNRs的形态可以携带祖先星的指纹以及祖先星雕刻的不均匀CSM,因此对LBV SNRs的研究有助于将核心坍缩SNe与大质量恒星的演化联系起来。我们调查的物理,化学和形态学特性的残余物的SNe起源于LBV,为了寻找签名,揭示的祖先的性质,在喷出物的分布和形态的残余物。作为LBV的模板,我们考虑实际的LBV候选Gal 026.47+0.02。我们选择了一个网格模型,它描述了一个大质量恒星的演化,其性质与Gal 026.47+0.02一致,其最终命运是核心坍缩SN。我们开发了一个3D HD模型,遵循爆炸后的演化的喷出物从爆发的冲击波在恒星表面的相互作用的SNR与CSM的特点是由两个密集的嵌套的环形壳,参数化与多波长观测Gal 026.47+0.02。我们的模型显示了一个强相互作用的爆炸波与CSM,这决定了一个重要的减速膨胀的喷出物在赤道平面的两个壳奠定,确定了高度的不对称的残余。经过10000年的演化,喷出物显示出一个细长的形状,形成一个广泛的喷流状结构所造成的相互作用与壳和取向沿轴的环形壳。

英文摘要:

LBVs are massive evolved stars that suffer sporadic and violent mass-loss events. They have been proposed as the progenitors of some core-collapse SNe, but this idea is still debated due to the lack of direct evidence. Since SNRs can carry in their morphology the fingerprints of the progenitor stars as well as of the inhomogeneous CSM sculpted by the progenitors, the study of SNRs from LBVs could help to place core-collapse SNe in context with the evolution of massive stars. We investigate the physical, chemical and morphological properties of the remnants of SNe originating from LBVs, in order to search for signatures, revealing the nature of the progenitors, in the ejecta distribution and morphology of the remnants. As a template of LBVs, we considered the actual LBV candidate Gal 026.47+0.02. We selected a grid of models, which describe the evolution of a massive star with properties consistent with those of Gal 026.47+0.02 and its final fate as core-collapse SN. We developed a 3D HD model that follows the post-explosion evolution of the ejecta from the breakout of the shock wave at the stellar surface to the interaction of the SNR with a CSM characterized by two dense nested toroidal shells, parametrized in agreement with multi-wavelength observations of Gal 026.47+0.02. Our models show a strong interaction of the blast wave with the CSM which determines an important slowdown of the expansion of the ejecta in the equatorial plane where the two shells lay, determining a high degree of asymmetry in the remnant. After 10000 years of evolution the ejecta show an elongated shape forming a broad jet-like structure caused by the interaction with the shells and oriented along the axis of the toroidal shells.

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