重温短高原SN 2018gj

IF 1.8 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astrophysics and Space Science Pub Date : 2024-05-17 DOI:10.1007/s10509-024-04311-9
V. P. Utrobin, N. N. Chugai
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引用次数: 0

摘要

我们提出了一个不寻常的IIP型SN 2018gj的替代模型。尽管短高原和早期伽马射线逃逸似乎有利于低质量的抛射物,但我们的流体动力学模型需要一个大质量的抛射物(≈23 (M_{\odot }\))。我们从早期光谱的氢线中发现的高喷出速度是流体力学模型的关键约束条件之一。我们恢复的风密度排除了星周相互作用对测光光度的显著贡献。我们发现早期放射性伽马射线逸出是由于56Ni的高速所致,而H(α)发射的不对称性则是由于56Ni喷出物的不对称性所致。现有的以统一方式进行流体力学研究的ⅠIP型超新星样本表明,56Ni喷出物的不对称性可能是其内在特性。在SN 2018gi和SN 2020jfo的早期光谱中发现的氢线暗示了外部喷出物的团块结构。通过已知的两个类似案例SN 2008in和SN 2012A,我们推测外喷出物的团块结构是与红超巨星爆炸有关的IIP型超新星所固有的。
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Revisiting short-plateau SN 2018gj

We present an alternative model of unusual type-IIP SN 2018gj. Despite the short plateau and early gamma-ray escape seeming to favor low-mass ejecta, our hydrodynamic model requires a large ejected mass (≈23 \(M_{\odot }\)). The high ejecta velocity, we find from hydrogen lines in early spectra, is among the crucial constraints on the hydrodynamic model. We recover the wind density that rules out a notable contribution of the circumstellar interaction to the bolometric luminosity. The early radioactive gamma-ray escape is found to be due to the high velocity of 56Ni, whereas the asymmetry of the H\(\alpha \) emission is attributed to the asymmetry of the 56Ni ejecta. The available sample of type-IIP supernovae studied hydrodynamically in a uniform way indicates that the asymmetry of the 56Ni ejecta is probably their intrinsic property. Hydrogen lines in the early spectra of SN 2018gi and SN 2020jfo are found to imply a clumpy structure of the outer ejecta. With two already known similar cases of SN 2008in and SN 2012A we speculate that the clumpiness of the outer ejecta is inherent to type-IIP supernovae related to the red supergiant explosion.

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来源期刊
Astrophysics and Space Science
Astrophysics and Space Science 地学天文-天文与天体物理
CiteScore
3.40
自引率
5.30%
发文量
106
审稿时长
2-4 weeks
期刊介绍: Astrophysics and Space Science publishes original contributions and invited reviews covering the entire range of astronomy, astrophysics, astrophysical cosmology, planetary and space science and the astrophysical aspects of astrobiology. This includes both observational and theoretical research, the techniques of astronomical instrumentation and data analysis and astronomical space instrumentation. We particularly welcome papers in the general fields of high-energy astrophysics, astrophysical and astrochemical studies of the interstellar medium including star formation, planetary astrophysics, the formation and evolution of galaxies and the evolution of large scale structure in the Universe. Papers in mathematical physics or in general relativity which do not establish clear astrophysical applications will no longer be considered. The journal also publishes topically selected special issues in research fields of particular scientific interest. These consist of both invited reviews and original research papers. Conference proceedings will not be considered. All papers published in the journal are subject to thorough and strict peer-reviewing. Astrophysics and Space Science features short publication times after acceptance and colour printing free of charge.
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