Tycho Brahe’s 1572 supernova as a standard type Ia as revealed by its light-echo spectrum
Tycho Brahe’s 1572 supernova as a standard type Ia as revealed by its light-echo spectrum
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DOI：
10.1038/nature07608
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发表时间：
2008-10
期刊：
影响因子：
64.8
通讯作者：
O. Krause;Masaomi Tanaka;T. Usuda;T. Hattori;M. Goto;S. Birkmann;K. Nomoto
中科院分区：
文献类型：
--
作者：
O. Krause;Masaomi Tanaka;T. Usuda;T. Hattori;M. Goto;S. Birkmann;K. Nomoto
Ia型超新星是近双星系统中白矮星的热核爆炸。它们作为宇宙距离指示器发挥着重要作用，并导致了宇宙加速膨胀的发现。关于超新星最重要的悬而未决的问题是，爆炸实际上是如何进行的，吸积是来自同伴还是两颗白矮星的合并。第谷·布拉赫1572年的超新星(SN 1572年)被认为是银河系中 Ia型超新星的最佳候选者之一。SN 1572残余物的接近使人们能够进行详细的研究，例如可能识别出双星伴星，并提供了一个独特的机会来测试爆炸机制和前驱物质的性质的理论。确定这颗超新星迄今未知的光谱类型对于将这些结果与 Ia型超新星的不同群体联系起来是至关重要的。在这里，我们报道了第谷超新星接近最大亮度的光谱，这是在爆炸的直接光扫过地球四个多世纪后，从散射光回波中获得的。我们发现SN 1572属于正规型 Ia型超新星的大多数类别。
Type Ia supernovae are thermonuclear explosions of white dwarf stars in close binary systems. They play an important role as cosmological distance indicators and have led to the discovery of the accelerated expansion of the Universe,. Among the most important unsolved questions about supernovae are how the explosion actually proceeds and whether accretion occurs from a companion or by the merging of two white dwarfs. Tycho Brahe’s supernova of 1572 (SN 1572) is thought to be one of the best candidates for a type Ia supernova in the Milky Way. The proximity of the SN 1572 remnant has allowed detailed studies, such as the possible identification of the binary companion, and provides a unique opportunity to test theories of the explosion mechanism and the nature of the progenitor. The determination of the hitherto unknown,,spectroscopic type of this supernova is crucial in relating these results to the diverse population of type Ia supernovae. Here we report an optical spectrum of Tycho’s supernova near maximum brightness, obtained from a scattered-light echo more than four centuries after the direct light from the explosion swept past the Earth. We find that SN 1572 belongs to the majority class of normal type Ia supernovae.