类SN 2002 cx超新星2008 ge的前身星和超新星
On the Progenitor and Supernova of the SN 2002cx-like Supernova 2008ge
摘要：
我们对超新星2008 ge进行了观测，它在光谱上与奇特的SN 2002 cx相似，它的爆炸前位置表明它的祖先可能是一颗白矮星。NGC 1527是SN 2008 ge的宿主星系，是一个S 0星系，没有恒星形成或大质量恒星的证据。天体测量匹配SN 2008 ge的后期成像到爆炸前的HST成像，我们限制了祖星的光度。由于SN 2008 ge的光谱中没有氢或氦的迹象，它的前身在爆炸前一定已经失去了外层，这就要求它是一颗白矮星、沃尔夫-拉叶星或双星系统中质量较低的恒星。对宿主星系的观测显示，在SN位置或其他任何地方都没有个别大质量恒星、星团或H II区的迹象，这使得沃尔夫-拉叶祖先不太可能存在。SN 2008 ge的后期光谱显示出强[Fe II]线，与同类其他成员相比，具有较大的速度宽度。这些以前看不见的特征表明，SN喷出物中有大量是Fe（推测是SN中产生的56 Ni放射性衰变的结果），进一步支持热核爆炸。将SN 2008 ge的观测结果与SN类中其他天体的观测结果相比较，我们认为其前身极有可能是一颗白矮星。
英文摘要：
We present observations of supernova (SN) 2008ge, which is spectroscopically similar to the peculiar SN 2002cx, and its pre-explosion site that indicate that its progenitor was probably a white dwarf. NGC 1527, the host galaxy of SN 2008ge, is an S0 galaxy with no evidence of star formation or massive stars. Astrometrically matching late-time imaging of SN 2008ge to pre-explosion HST imaging, we constrain the luminosity of the progenitor star. Since SN 2008ge has no indication of hydrogen or helium in its spectrum, its progenitor must have lost its outer layers before exploding, requiring that it be a white dwarf, a Wolf-Rayet star, or a lower-mass star in a binary system. Observations of the host galaxy show no signs of individual massive stars, star clusters, or H II regions at the SN position or anywhere else, making a Wolf-Rayet progenitor unlikely. Late-time spectroscopy of SN 2008ge show strong [Fe II] lines with large velocity widths compared to other members of this class at similar epochs. These previously unseen features indicate that a significant amount of the SN ejecta is Fe (presumably the result of radioactive decay of 56Ni generated in the SN), further supporting a thermonuclear explosion. Placing the observations of SN 2008ge in the context of observations of other objects in the class of SN, we suggest that the progenitor was most likely a white dwarf.
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