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arXiv 0707.3485astro-ph
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IIP型超新星SN 2004 et:X射线、光学和射电的多波长研究

Type IIP Supernova SN 2004et: A Multi-Wavelength Study in X-Ray, Optical and Radio

Kuntal Misra, Dave Pooley, Poonam Chandra, D. Bhattacharya, Alak K. Ray, Ram Sagar, Walter H. G. Lewin

摘要:

本文报道了对SN 2004 et的X射线、宽带光学和低频射电观测。\cxo在三个时期观测到了超新星,光学覆盖范围涵盖了自爆炸以来的$\sim$ 470天。X射线发射随时间衰减,我们将X射线亮度演化表示为$\Lx \propto t^{-0.4}$。我们利用观测到的X射线光度来估计$\sim \ee{2}{-6} M_\odot \mathrm{yr}^{-1}$的祖星的质量损失率。光学光变曲线显示出持续约110天的显著平台。通过黑体拟合确定了平台期光球半径和色温的时间演化。我们估计出$^{56}$ Ni的喷射质量为0.06 $\pm$ 0.03 M $_\odot$。利用Litvinova和Nadëzhin(1985)的表达式,我们估计爆炸能量为(0.98 $\pm$ 0.25)$\times 10^{51}$ erg。我们还介绍了SN 2004 et的单历元射电观测。我们将其与Chevalier等人(2006)提出的模型的预测进行比较。这些多波长研究表明SN 2004 et的$\sim$ 20 M $_\odot$的主序列祖细胞质量。

英文摘要:

We present X-ray, broad band optical and low frequency radio observations of the bright type IIP supernova SN 2004et. The \cxo observed the supernova at three epochs, and the optical coverage spans a period of $\sim$ 470 days since explosion. The X-ray emission softens with time, and we characterise the X-ray luminosity evolution as $\Lx \propto t^{-0.4}$. We use the observed X-ray luminosity to estimate a mass-loss rate for the progenitor star of $\sim \ee{2}{-6} M_\odot \mathrm{yr}^{-1}$. The optical light curve shows a pronounced plateau lasting for about 110 days. Temporal evolution of photospheric radius and color temperature during the plateau phase is determined by making black body fits. We estimate the ejected mass of $^{56}$Ni to be 0.06 $\pm$ 0.03 M$_\odot$. Using the expressions of Litvinova & Nadëzhin (1985) we estimate an explosion energy of (0.98 $\pm$ 0.25) $\times 10^{51}$ erg. We also present a single epoch radio observation of SN 2004et. We compare this with the predictions of the model proposed by Chevalier et al. (2006). These multi-wavelength studies suggest a main sequence progenitor mass of $\sim$ 20 M$_\odot$ for SN 2004et.

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