统一喷气驱动恒星爆炸的动物园
Unifying the Zoo of Jet-Driven Stellar Explosions
摘要：
我们提出了一套恒星爆炸引起的相对论射流从一个中央发动机坐在紧凑的，垂死的恒星中心的数值模拟。我们探讨了广泛的持续时间的中央发动机活动，两个候选恒星的祖先，和两个可能的值的总能量释放。我们发现，即使喷流被严格准直，它们与恒星的相互作用也会释放恒星物质，产生恒星爆炸。我们还发现，爆炸的结果可能会有很大的不同，这取决于发动机活动的持续时间。只有最持久的引擎才能成功地产生伽马射线暴。发动机只在短时间内为喷流提供动力，导致相对论性超新星爆炸，类似于观察到的发动机驱动的SNe，如SN2009bb。具有中等持续时间的引擎产生弱的伽马射线暴，其性质类似于附近的暴，如GRB 980425。最后，我们发现持续时间最短的引擎，如果它们存在于自然界中，产生恒星爆炸，缺乏相当数量的相对论喷出物，因此在动力学上与普通的核心坍缩超新星没有区别。
英文摘要：
We present a set of numerical simulations of stellar explosions induced by relativistic jets emanating from a central engine sitting at the center of compact, dying stars. We explore a wide range of durations of the central engine activity, two candidate stellar progenitors, and two possible values of the total energy release. We find that even if the jets are narrowly collimated, their interaction with the star unbinds the stellar material, producing a stellar explosion. We also find that the outcome of the explosion can be very different depending on the duration of the engine activity. Only the longest-lasting engines result in successful gamma-ray bursts. Engines that power jets only for a short time result in relativistic supernova explosions, akin to observed engine-driven SNe such as SN2009bb. Engines with intermediate durations produce weak gamma-ray bursts, with properties similar to nearby bursts such as GRB 980425. Finally, we find that the engines with the shortest durations, if they exist in nature, produce stellar explosions that lack sizable amounts of relativistic ejecta and are therefore dynamically indistinguishable from ordinary core-collapse supernovae.
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