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arXiv 2003.14097astro-ph.HE
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红超巨星的激波爆发:分析和数值预测

Shock breakouts from red supergiants: analytical and numerical predictions

Alexandra Kozyreva, Ehud Nakar, Roni Waldman, Sergei Blinnikov, Petr Baklanov

摘要:

冲击爆发(SBO)信号是超新星爆炸除引力波和中微子之外的第一个信号。SBO的观测性质,如热光度和色温,与超新星的祖先和爆炸参数有关。探测SBO或SBO冷却将限制坍缩恒星的祖先和爆炸模型。根据最近发射的eROSITA望远镜,SBO的探测率是一年中的几个事件。在当前的研究中,我们检查了Shussman等人推导的分析公式。(2016)。我们使用他们研究中的四个红超巨星模型,同时使用辐射流体动力学代码STELLA运行爆炸。我们的结论是,有一个很好的协议之间的解析和数值方法的热光度和色温在SBO。可以使用基于全局超新星参数的SBO信号的解析公式,而不是运行耗时的数值模拟。我们定义的光谱范围内的SBO光谱的解析公式是有效的。我们提供了改进的解析表达式的SBO光谱能量分布。我们确认的色温依赖于由分析研究得出的半径,并建议使用早期的观测来限制祖半径。此外,我们还预测了eROSITA仪器观测到的红超巨星的SBO信号。

英文摘要:

Shock breakout (SBO) signal is the first signature of the supernova explosion apart from gravitational waves and neutrinos. Observational properties of SBO, such as bolometric luminosity and colour temperature, connect to the supernova progenitor and explosion parameters. Detecting SBO or SBO-cooling will constrain the progenitor and explosion models of collapsing stars. In the light of recently launched eROSITA telescope, the rate for detection of SBO is a few events during a year. In the current study, we examine the analytic formulae derived by Shussman et al. (2016). We use four red supergiant models from their study, while running explosions with the radiation hydrodynamics code STELLA. We conclude that there is a good agreement between analytic and numerical approaches for bolometric luminosity and colour temperature during SBO. The analytic formulae for the SBO signal based on the global supernova parameters can be used instead of running time-consuming numerical simulations. We define spectral range where analytic formulae for the SBO spectra are valid. We provide improved analytical expression for the SBO spectral energy distribution. We confirm dependence of colour temperature on radius derived by analytical studies and suggest to use early time observations to confine the progenitor radius. Additionally we show the prediction for the SBO signal from red supergiants as seen by eROSITA instrument.

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