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arXiv 1509.07129astro-ph.HEastro-ph.SR
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1999年类aa Ia型超新星iPTF14bdn的紫外和光学性质

The 1999aa-like Type Ia Supernova iPTF14bdn in the Ultraviolet and Optical

Michael T. Smitka, Peter J. Brown, Nicholas B. Suntzeff, Jujia Zhang, Xiaofeng Wang, Qian Zhai, Jun Mo, Tianmeng Zhang

摘要:

本文介绍了1999年类aa超新星iPTF 14 bdn的紫外和光学光度学和光谱。紫外数据是使用雨燕紫外/光学望远镜(UVOT)观测的,构成了1999 aa类SN的第一个紫外光谱系列。根据光度测定法,我们在早于$-5$天的时期测量$Δm_{15}({\it B})\,=\,0.84 \pm0.05$ mag和蓝色UV颜色。光谱表明,早期的蓝色是$2800 - 3200 \,Å~$之间的吸收比正常Ia型超新星中的吸收少的结果。使用模型光谱拟合的数据在$-10 $和$+10 $天,我们确定了这个光谱特征的起源是一个温度效应,其中双电离铁族元素创建一个不透明的“窗口”。我们确定,高温和大量的铁族元素在早期时代的检测意味着混合到SN喷出物的外层的高Ni质量。我们还确定了来源的I-波段的第二个最大的iPTF 14 bdn的Fe III到Fe II的衰变,是在正常的超新星Ia。

英文摘要:

We present ultraviolet (UV) and optical photometry and spectra of the 1999aa-like supernova (SN) iPTF14bdn. The UV data were observed using the Swift Ultraviolet/Optical Telescope (UVOT) and constitute the first UV spectral series of a 1999aa-like SN. From the photometry we measure $Δm_{15}({\it B})\,=\,0.84 \pm0.05$ mag and blue UV colors at epochs earlier than $-5$ days. The spectra show that the early-time blue colors are the result of less absorption between $2800 - 3200 \,Å~$ than is present in normal SNe Ia. Using model spectra fits of the data at $-10 $ and $+10 $ days, we identify the origin of this spectral feature to be a temperature effect in which doubly ionized iron group elements create an opacity 'window'. We determine that the detection of high temperatures and large quantities of iron group elements at early epochs imply the mixing of a high Ni mass into the outer layers of the SN ejecta. We also identify the source of the I-band secondary maximum in iPTF14bdn to be the decay of Fe III to Fe II, as is seen in normal SNe Ia.

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