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arXiv 0705.2381astro-ph
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Ia型超新星的晚期发射:SN 2001 el的光学和近红外观测

Late-time emission of type Ia supernovae: optical and near-infrared observations of SN 2001el

Maximilian Stritzinger, Jesper Sollerman

摘要:

我们目前的光学和近红外线曲线SN 2001 el从310至445天过去的最大光,获得的甚大望远镜。晚时光学(UBVRI)光变曲线在U、B、V、R和I波段的衰减时间尺度分别为1.43 \pm 0.14、1.43 \pm 0.06、1.48 \pm 0.06、1.45 \pm 0.07和1.03 \pm 0.07等(每百日),几乎呈线性衰减。相比之下,在近红外(JHKs)波段的通量的时间演化似乎是几乎恒定的,在这些时期。我们在J和H波段分别测量到0.19 \pm 0.10和0.17 \pm 0.11量级的下降率(每百日)。我们构造了紫外光变曲线,发现晚期光度的衰减时间尺度与正电子动能的完全沉积几乎一致。正常Ia型SN 2001 el的后期光变曲线证明了近红外贡献的重要性增加。这是以前在特殊的SN 2000 cx中观察到的,因此SN 2001 el的结果确保了以前基于单个特殊事件的结论适用于正常的Ia型超新星。测得的后期UVOIR下降率表明,大多数正电子被困在喷出物中。这一结果不利于弱和/或径向梳状磁场配置的预测。

英文摘要:

We present optical and near-infrared light curves of SN 2001el from 310 to 445 days past maximum light, obtained with the Very Large Telescope. The late-time optical (UBVRI) light curves decay in a nearly linear fashion with decay time scales of 1.43\pm0.14, 1.43\pm0.06, 1.48\pm0.06, 1.45\pm0.07, and 1.03\pm0.07 magnitudes (per hundred days) in the U, B, V, R and I bands, respectively. In contrast, in the near-infrared (JHKs) bands the time evolution of the flux appears to be nearly constant at these epochs. We measure decline rates (per hundred days) of 0.19\pm0.10 and 0.17\pm0.11 magnitudes in the J and H bands, respectively. We construct a UVOIR light curve, and find that the late-time luminosity has a decay time scale nearly consistent with complete depostion of positron kinetic energy. The late-time light curves of the normal type Ia SN 2001el demonstrate the increased importance of the near-infrared contribution. This was previously observed in the peculiar SN 2000cx, and the results for SN 2001el thus ensure that the conclusions previously based on a single peculiar event are applicable to normal type Ia supernovae. The measured late-time UVOIR decline rate suggests that a majority of the positrons are trapped within the ejecta. This results does not favor the predictions of a weak and/or radially combed magnetic field configuration.

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