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arXiv 0802.2082astro-ph
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发现Ia型超新星的前身2007年

Discovery of the progenitor of the type Ia supernova 2007on

Rasmus Voss, Gijs Nelemans

摘要:

Ia型超新星是爆炸的恒星,用于测量宇宙的加速膨胀,并负责产生大部分的铁。虽然人们普遍认为爆炸的恒星是双星系统中的一颗白矮星,但爆炸的确切结构和触发机制尚不清楚,这可能会妨碍它们用于精确的宇宙学。已经提出了两个家族的祖细胞模型。在第一种情况下,一颗白矮星从伴星吸积物质,直到它的质量超过阿布拉塞卡,坍缩并爆炸。或者,两颗白矮星合并,再次导致灾难性的坍塌和爆炸。到目前为止,还不可能确定这两种模型是否正确。在这里,我们报告了在超新星爆发前的X射线图像中发现的一个物体,它位于椭圆星系NGC 1404中最近的Ia型超新星(2007年)的位置。深层光学图像(也是档案)没有显示这个物体的迹象。由此我们得出结论,X射线源是超新星的祖先,这有利于这颗超新星的吸积模型,尽管宿主星系比吸积模型中预测的爆炸年龄更老(6-9 Gyr)。

英文摘要:

Type Ia supernovae are exploding stars that are used to measure the accelerated expansion of the Universe and are responsible for most of the iron ever produced. Although there is general agreement that the exploding star is a white dwarf in a binary system, the exact configuration and trigger of the explosion is unclear, which could hamper their use for precision cosmology. Two families of progenitor models have been proposed. In the first, a white dwarf accretes material from a companion until it exceeds the Chandrasekhar mass, collapses and explodes. Alternatively, two white dwarfs merge, again causing catastrophic collapse and an explosion. It has hitherto been impossible to determine if either model is correct. Here we report the discovery of an object in pre-supernova archival X-ray images at the position of the recent type Ia supernova (2007on) in the elliptical galaxy NGC 1404. Deep optical images (also archival) show no sign of this object. From this we conclude that the X-ray source is the progenitor of the supernova, which favours the accretion model for this supernova, although the host galaxy is older (6-9 Gyr) than the age at which the explosions are predicted in the accreting models.

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