双爆超新星
(原标题: A Double Detonation Supernova)
2025-07-22
浏览次数: 1496
有些超新星会爆炸两次吗？是的，当第一次爆炸成为第二次爆炸的引爆器。这是超新星遗迹（信噪比）0509-67.5成因的主要假设。在这个双星系统中，引力使体积更大、更蓬松的恒星将质量让给体积更小、密度更大的白矮星伴星。最终，这颗白矮星的近表面温度变得如此之高，以至于它爆炸了，产生了既向外又向内的冲击波，从而在中心附近触发了一颗完整的Ia型超新星。最近的SNR 0509-67.5系统的图像，就像智利甚大望远镜的特色图像一样，显示了两个半径和成分与双重爆炸假说一致的壳层。这个名为SNR 0509-67.5的星系也因两个悬而未决的谜团而闻名：为什么400年前它的明亮超新星没有被发现，为什么没有可见的伴星留下。
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Can some supernovas explode twice? Yes, when the first explosion acts like a detonator for the second. This is a leading hypothesis for the cause of supernova remnant (SNR) 0509-67.5. In this two-star system, gravity causes the larger and fluffier star to give up mass to a smaller and denser white dwarf companion. Eventually the white dwarf's near-surface temperature goes so high that it explodes, creating a shock wave that goes both out and in -- and so triggers a full Type Ia supernova near the center. Recent images of the SNR 0509-67.5 system, like the featured image from the Very Large Telescope in Chile, show two shells with radii and compositions consistent with the double detonation hypothesis. This system, SNR 0509-67.5 is also famous for two standing mysteries: why its bright supernova wasn't noted 400 years ago, and why no visible companion star remains.