受限星周介质中超新星激波突破的可观测特征
Observable Signatures of Supernova Shock Breakout in Confined Circumstellar Medium
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中文总结 AI 辅助
本研究通过二维辐射流体动力学模拟，揭示了红超巨星在受限星周介质中激波突破的辐射前驱体与流体混合效应，预测了峰值光度、极紫外发射及可观测诊断特征，为当前及未来紫外/X射线望远镜探测提供依据。
中文摘要 AI 辅助
超新星激波突破编码了恒星爆炸的丰富信息，包括前身星的性质、爆炸机制以及星周环境。我们首次对嵌入在核心坍缩前不久产生的受限星周介质（CSM）中的红超巨星（RSG）前身星的激波突破进行了二维多群辐射流体动力学模拟。我们的模拟揭示，在激波前方逃逸的辐射形成辐射前驱体，该前驱体预先加速CSM并引发强烈的流体动力学混合。这种混合显著改变了突破光球层的结构和演化，从而改变了出射辐射。由此产生的热光度曲线达到峰值光度$1.43$-$3.15 \times 10^{44}\rm{erg\\ s^{-1}}$，持续时间为$4.1\text{--}35.4$小时，这些特征由CSM质量和受限半径控制。我们的多波长计算进一步揭示了显著的极紫外辐射，其中能量${\ge}54.4$~eV的电离光子可以维持闪光电离的He-II，并驱动其$\lambda 4686$埃复合线的强发射。此外，我们识别了致密CSM中激波突破的诊断特征，并评估了它们被爱因斯坦探针和ULTRASAT探测的可能性。我们的模型和预测为CSM中的激波突破提供了有前景的诊断手段，这些特征可能被当前和即将到来的高节奏紫外和X射线空间望远镜探测到。
英文摘要
Supernova shock breakout encodes rich information about stellar explosions, including the properties of the progenitor, the explosion mechanism, and the circumstellar environment. We present the first two-dimensional multigroup radiation-hydrodynamic simulations of shock breakout from Red Supergiant (RSG) progenitor stars embedded in confined circumstellar medium (CSM) produced shortly before core collapse. Our simulations reveal that radiation escaping ahead of the shock forms a radiative precursor that pre-accelerates the CSM and induces strong hydrodynamic mixing. This mixing substantially modifies the structure and evolution of the breakout photosphere and, consequently, the emergent radiation. The resulting bolometric light curves reach peak luminosities of $1.43$-$3.15 \times 10^{44}\ \mathrm{erg\ s^{-1}}$ with duration of $4.1\text{--}35.4$~hr, with these signatures controlled by the CSM mass and the confined radius. Our multiwavelength calculations further reveal a pronounced extreme-ultraviolet emission, where ionizing photons of energies ${\ge}54.4$~eV can sustain flash-ionized He-II and power strong emission from its recombination line of $λ4686$ angstrom. Furthermore, we identify diagnostic signatures of shock breakout with dense CSM and assess their detectability with Einstein Probe and ULTRASAT. Our models and predictions provide promising diagnostics of shock breakout in CSM that may be detectable by current and forthcoming high-cadence ultraviolet and X-ray space telescopes.
发表机构
- National Taiwan University（台湾大学）
- Academia Sinica, Institute of Astronomy and Astrophysics（中央研究院天文及天文物理研究所）
- Heidelberger Institut für Theoretische Studien（海德堡理论研究所）
- Kyoto University（京都大学）
- Zentrum für Astronomie der Universität Heidelberg（海德堡大学天文学计算中心）
机构由 AI 辅助整理，请以论文原文为准。
