arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.03612astro-ph.HE
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壁外:I型超新星与部分上掠星周介质相互作用的流体动力学

Outside the Wall: Hydrodynamics of Type I Supernovae Interacting with a Partially Swept-Up Circumstellar Medium

Chelsea E. Harris, Peter E. Nugent

摘要:

解释观测到的超新星(SNe)的多样性和爆炸的物理需要他们的祖星的知识,这可以通过限制星周介质(CSM)。SN喷出物与CSM碰撞的模型是必要的,以推断CSM的结构,并将其与祖先模型联系起来。最近的SNe I显示CSM集中在距离$r\sim10^16$ cm处,SN相互作用的模型非常有限。在本文中,我们假设集中区是一个“墙”表示扫过的材料,和未扫过的材料位于墙外。我们模拟一维流体动力学的SNe Ia和Ib影响300独特的CSM配置使用RT 1D,它捕获的瑞利-泰勒不稳定性。我们发现,壁和喷出物之间的密度比-表示为$A_0$或“壁高”-是关键,更高的壁偏离自相似演化。函数拟合占$A_0$的前向激波半径的演变。我们发现,更高的墙壁有更多的退化CSM属性之间的减速参数,较慢的冲击,更深的探测反向冲击,更慢的冲击喷出物,更少的喷出物质量比CSM在冲击,和更多的混合喷出物进入CSM在早期。我们分析了SN 2014 C(Ib型)的观测结果,认为它有一个中等高的壁($10 < A_0 < 200$)和风状的外部CSM。我们还假设SN 2014 C的无线电数据的另一种解释,即无线电上升发生在风中,而不是墙壁。最后,我们发现,在很晚的时间流体动力学测量不能区分的存在下,一个墙,也许除了作为一个巨大的冲击区。

英文摘要:

Explaining the observed diversity of supernovae (SNe) and the physics of explosion requires knowledge of their progenitor stars, which can be obtained by constraining the circumstellar medium (CSM). Models of the SN ejecta colliding with CSM are necessary to infer the structure of the CSM and tie it back to a progenitor model. Recent SNe I revealed CSM concentrated at a distance $r\sim10^16$ cm, for which models of SN interaction are extremely limited. In this paper, we assume the concentrated region is a "wall" representing swept-up material, and unswept material lies outside the wall. We simulate one-dimensional hydrodynamics of SNe Ia & Ib impacting 300 unique CSM configurations using RT1D, which captures the Rayleigh-Taylor instability. We find that the density ratio between the wall and ejecta -- denoted $A_0$ or "wall height" -- is key, and higher walls deviate more from self-similar evolution. Functional fits accounting for $A_0$ are presented for the forward shock radius evolution. We show that higher walls have more degeneracy between CSM properties in the deceleration parameter, slower shocks, deeper-probing reverse shocks, slower shocked ejecta, less ejecta mass than CSM in the shock, and more mixing of ejecta into the CSM at early times. We analyze observations of SN 2014C (Type Ib) and suggest that it had a moderately high wall ($10 < A_0 < 200$) and wind-like outer CSM. We also postulate an alternate interpretation for the radio data of SN 2014C, that the radio rise occurs in the wind rather than the wall. Finally, we find that hydrodynamic measurements at very late times cannot distinguish the presence of a wall, except perhaps as an anomalously wide shock region.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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