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arXiv 1808.01545astro-ph.HE
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Ia型超新星双爆轰的三维简并模型模拟及喷发物与幸存的白矮星伴星相互作用

Three-Dimensional Simulation of Double-Detonations in the Double-Degenerate Model for Type Ia Supernovae and Interaction of Ejecta with a Surviving White Dwarf Companion

Ataru Tanikawa, Ken'ichi Nomoto, Naohito Nakasato

摘要:

本文研究了Ia型超新星(SNe~Ia)双爆轰模型中的流体动力学和核合成,以及在双简并情况下喷出物与幸存白矮星(WD)伴星的相互作用。我们建立了一个含$1.0M_\odot$和$0.6M_\odot$碳氧(CO)WD的双星系统,其中主WD由CO核和氦(He)壳组成,分别含$0.95$和$0.05M_\odot$。我们遵循的双星系统的演化,从启动的He爆轰,点火和传播的CO爆轰,和相互作用的SN喷出物与同伴WD。伴随的WD(或幸存的WD)获得$\sim 1700$ ~km~s $^{-1}$的甩出速度,并捕获$\sim 0.03M_\odot$的$^{56}$ Ni和$3 \times 10^{-4}M_\odot$的He。这样的He可以在幸存的WD表面上检测到。SN喷出物包含一个“伴源流”和从伴WD($\sim 3 \cdot 10^{-3}M_\odot$)剥离的未燃烧物质,尽管流的组成取决于伴WD的He壳质量。喷出物也有一个速度漂移$\sim 1000$ ~km~s $^{-1}$由于爆炸的初级WD的二进制运动。这些特征在未燃烧物质(如SN~ 2010 lp和iPTF 14 atg)的氧发射线的星云相光谱中以及来自速度漂移的蓝移或红移的铁族发射线(如亚发光SNe~Ia的一部分)的星云相光谱中将是突出的。我们期望与D $^6$模型对应的SN~Ia能为SN~Ia的观测留下这些指纹。

英文摘要:

We study the hydrodynamics and nucleosynthesis in the double-detonation model of Type Ia supernovae (SNe~Ia) and the interaction between the ejecta and a surviving white dwarf (WD) companion in the double-degenerate scenario. We set up a binary star system with $1.0M_\odot$ and $0.6M_\odot$ carbon-oxygen (CO) WDs, where the primary WD consists of a CO core and helium (He) shell with $0.95$ and $0.05M_\odot$, respectively. We follow the evolution of the binary star system from the initiation of a He detonation, ignition and propagation of a CO detonation, and the interaction of SN ejecta with the companion WD. The companion (or surviving) WD gets a flung-away velocity of $\sim 1700$~km~s$^{-1}$, and captures $^{56}$Ni of $\sim 0.03M_\odot$, and He of $3 \times 10^{-4}M_\odot$. Such He can be detected on the surface of surviving WDs. The SN ejecta contains a `companion-origin stream', and unburned materials stripped from the companion WD ($\sim 3 \cdot 10^{-3}M_\odot$), although the stream compositions would depend on the He shell mass of the companion WD. The ejecta has also a velocity shift of $\sim 1000$~km~s$^{-1}$ due to the binary motion of the exploding primary WD. These features would be prominent in nebular-phase spectra of oxygen emission lines from the unburned materials like SN~2010lp and iPTF14atg, and of blue- or red-shifted Fe-group emission lines from the velocity shift like a part of sub-luminous SNe~Ia. We expect SN~Ia counterparts to the D$^6$ model would leave these fingerprints for SN~Ia observations.

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