AI 中文总结
该研究通过MESA和Stella数值模拟发现，双星系统中核心坍缩超新星的星周物质呈非球对称，观测视角差异会导致光变曲线显著不同，用一维框架解释会引入较大偏差，揭示了超新星多样性的重要驱动因素。
AI 中文摘要
核心坍缩超新星（CCSNe）的可观测特性高度依赖于前身星爆炸前质量损失形成的星周物质（CSM）。由于大部分CCSNe前身星处于双星系统中，双星相互作用会显著影响前身星结构和周围CSM，但这种相互作用对观测到的CCSNe景观的影响仍未得到很好的约束。本研究中，我们研究经历稳定洛希瓣溢流的双星系统产生的CCSNe，使用MESA构建了一组双星演化模型，固定初始主星质量为16倍太阳质量，探索次星质量范围为12-15倍太阳质量、初始轨道周期大于500天的情况。我们从得到的质量损失历史和轨道动力学中生成三维（3D）CSM结构，沿三条视线方向提取与角度相关的密度分布，并使用辐射流体动力学代码Stella计算多波段光变曲线。我们发现，双星驱动的CSM呈现高度非球对称的形态，由轨道周期和质量比决定。超新星抛射物与这种结构化介质的相互作用会在光变曲线中产生显著的观测视角依赖性，峰值光度因观测方位不同相差约5倍，后期B-V色指数变化约1.5星等。我们进一步表明，用假设孤立前身星和球形星风的一维框架解释这类事件，会对推断的爆炸特性引入高达50%的偏差，对推断的质量损失率引入超过200%的偏差。我们的结果表明，相当一部分相互作用型II型超新星的多样性源于双星形成的非对称CSM和观测视角效应，这为解释这些暂现源提供了多维方法的动机。
英文摘要
Observable properties of core-collapse supernovae (CCSNe) depend sensitively on the circumstellar material (CSM) formed by pre-explosion mass loss from the progenitor star. Since a large fraction of CCSN progenitors reside in binaries, both the progenitor structure and surrounding CSM can be significantly impacted by binary interaction. Yet, its impact on the observed CCSN landscape remains poorly constrained. In this work, we investigate CCSNe from binary systems undergoing stable Roche lobe overflow. We construct a suite of binary evolution models in \texttt{MESA} with a fixed initial primary mass ($16M_{\odot}$), exploring secondary masses in the range $12-15M_{\odot}$ and initial orbital periods $>500$ days. We generate three-dimensional (3D) CSM structures from the resulting mass-loss histories and orbital dynamics, extract angle-dependent density profiles along three lines of sight, and compute multi-band light curves with the radiation-hydrodynamics code \texttt{Stella}. We find that binary-driven CSM develops highly aspherical morphologies, governed by the orbital period and the mass ratio. Interaction between SN ejecta and this structured medium produces pronounced viewing-angle dependence in the light curves, with peak luminosities differing by factors of $\sim5$ and late-time $B-V$ colors varying by $\sim1.5$ mag depending on observer orientation. We further show that interpreting such events with one-dimensional frameworks assuming isolated progenitors and spherical winds can introduce biases up to $50\%$ for inferred explosion properties and $>200\%$ for inferred mass-loss rates. Our results are consistent with a substantial fraction of interacting Type II SN diversity arising from binary-shaped asymmetric CSM and viewing-angle effects, motivating multidimensional approaches to interpreting these transients.
Comments19 pages, 12 figures, submitted to AAS journals. Comments are welcome
