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arXiv 1006.2268astro-ph.SRastro-ph.HE
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确定II型超新星祖先的主序星质量

Determining the main-sequence mass of Type II supernova progenitors

Luc Dessart, Eli Livne, Roni Waldman

摘要:

我们提出了辐射流体动力学模拟的核心坍缩超新星(SN)爆炸,人工产生的驱动活塞在一个旋转或非旋转的红超巨星祖星的信封的底部。我们寻找喷出物运动学的趋势,在由此产生的II型高原(II-P)SN,探索爆炸能量和前SN恒星演化模型的依赖关系。我们恢复平凡的结果,较大的爆炸能量产生较大的喷出物的速度在一个给定的祖。然而,我们强调,对于一个给定的爆炸能量,增加氦核心质量与主序列质量的这种II-P SN祖导致喷射的核心嵌入富氧物质在更大的速度。我们发现,光球速度在15天后,冲击爆发是一个很好的和简单的指示爆炸能量在我们选择的一套前SN模型。这个测量值,结合星云相OI 6303 - 6363 A线的宽度,可以用来确定主序质量的上限。使用我们的模拟结果,我们发现,目前,但显着不足,晚的时间光谱类型II-P SNe支持祖主序列质量低于~ 20 Msun,从而证实了推断的基础上直接,但困难,祖识别爆炸前的图像。II-P型超新星中OI 6303 - 6363 A的星云光谱宽度很窄,不支持25- 30 Msun范围内的高质量祖星。结合定量光谱建模,这种诊断提供了一种手段来约束的主要序列质量的祖,质量分数的核心弹出,因此,质量的紧凑的残余物形成。

英文摘要:

We present radiation-hydrodynamics simulations of core-collapse supernova (SN) explosions, artificially generated by driving a piston at the base of the envelope of a rotating or non-rotating red-supergiant progenitor star. We search for trends in ejecta kinematics in the resulting Type II-Plateau (II-P) SN, exploring dependencies with explosion energy and pre-SN stellar-evolution model. We recover the trivial result that larger explosion energies yield larger ejecta velocities in a given progenitor. However, we emphasise that for a given explosion energy, the increasing helium-core mass with main-sequence mass of such Type II-P SN progenitors leads to ejection of core-embedded oxygen-rich material at larger velocities. We find that the photospheric velocity at 15d after shock breakout is a good and simple indicator of the explosion energy in our selected set of pre-SN models. This measurement, combined with the width of the nebular-phase OI6303-6363A line, can be used to place an upper-limit on the progenitor main-sequence mass. Using the results from our simulations, we find that the current, but remarkably scant, late-time spectra of Type II-P SNe support progenitor main-sequence masses inferior to ~20Msun and thus, corroborate the inferences based on the direct, but difficult, progenitor identification in pre-explosion images. The narrow width of OI6303-6363A in Type II-P SNe with nebular spectra does not support high-mass progenitors in the range 25-30Msun. Combined with quantitative spectroscopic modelling, such diagnostics offer a means to constrain the main-sequence mass of the progenitor, the mass fraction of the core ejected, and thus, the mass of the compact remnant formed.

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