SN 2008 S：超新星冒名顶替者中的冷超级爱丁顿风
SN 2008S: A Cool Super-Eddington Wind in a Supernova Impostor
摘要：
本文介绍了超新星SN 2008 S的可见光光度学和光谱学。根据SN 2008 S的峰值亮度较低（MR = -13.9等），光度和光谱演化与低亮度SN e不同，后期衰减速率比56 Co慢，流出速度较低（600-1000 km/s），我们认为SN 2008 S不是一个真正的核塌缩SN，可能也不是一个电子俘获SN。相反，我们表明，SN 2008 S更像一个“SN冒名顶替者”的事件，如SN 1997 bs，类似于大爆发的LBV。它的总辐射能量为1e47.8尔格，在事件中可能喷射了0.05-0.2兆太阳。我们发现SN 2008 S的光谱与银河系超巨星IRC+10420的光谱之间有着不可思议的相似性，IRC +10420主要由不透明风中形成的窄H-α，[Ca II]和Ca II发射线组成。我们提出了一个方案，其中SN 2008 S的巨大的超级爱丁顿风部分失败，因为减少不透明度由于重组，建议为IRC+10420。已知易受爆发性LBV样质量损失影响的初始质量范围可扩展到20-25 Msun，但对SN 2008 S（以及类似的NGC 300瞬变）的祖先的估计可能会将此范围扩展到约15 Msun。因此，SN 2008 S可能与SN 1987 A的祖先有关。
英文摘要：
We present visual-wavelength photometry and spectroscopy of supernova SN2008S. Based on the low peak luminosity for a SN of M_R = -13.9 mag, photometric and spectral evolution unlike that of low-luminosity SNe, a late-time decline rate slower than 56Co decay, and slow outflow speeds of 600-1000 km/s, we conclude that SN2008S is not a true core-collapse SN and is probably not an electron-capture SN. Instead, we show that SN2008S more closely resembles a "SN impostor" event like SN1997bs, analogous to the giant eruptions of LBVs. Its total radiated energy was 1e47.8 ergs, and it may have ejected 0.05-0.2 Msun in the event. We discover an uncanny similarity between the spectrum of SN 2008S and that of the Galactic hypergiant IRC+10420, which is dominated by narrow H-alpha, [Ca II], and Ca II emission lines formed in an opaque wind. We propose a scenario where the vastly super-Eddington wind of SN2008S partly fails because of reduced opacity due to recombination, as suggested for IRC+10420. The range of initial masses susceptible to eruptive LBV-like mass loss was known to extend down to 20-25 Msun, but estimates for the progenitor of SN2008S (and the similar NGC300 transient) may extend this range to around 15 Msun. As such, SN2008S may have implications for the progenitor of SN1987A.
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