Red and Reddened: Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp
Red and Reddened: Ultraviolet through Near-infrared Observations of Type Ia Supernova 2017erp
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红色和变红：Ia 型超新星 2017erp 的紫外线和近红外观测
DOI：
10.3847/1538-4357/ab1a3f
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发表时间：
2018-08
影响因子：
4.9
通讯作者：
Marion G.
中科院分区：
文献类型：
--
作者：
Brown Peter J.;Hosseinzadeh Griffin;Jha Saurabh W.;S;David;Vieira Ethan;Wang Xiaofeng;Dai Mi;Dettman Kyle G.;Mould Jeremy;Uddin Syed;Wang Lifan;Arcavi Iair;Bento Joao;Burns Chris R.;Diamond Tiara;Hiramatsu Daichi;Howell D. Andrew;Hsiao E. Y.;Marion G.
我们提出了空间为基础的紫外/光学光度学和光谱学与斯威夫特紫外/光学望远镜和哈勃太空望远镜（HST），分别与地面为基础的光学光度学和光谱学沿着和近红外光谱超新星SN 2017 erp。光学光变曲线和光谱与正常的Ia超新星一致。与之前的近紫外（NUV）光度样本相比，SN 2017 erp的紫外颜色比校正为类似光学颜色的NUV蓝色SNe Ia更红。SNe 2011 fe和2017 erp之间的色差主要是紫外线的内在差异，而不是预期的尘埃变红。这种色差类似于SALT 2色定律，它是由较高红移的Ia超新星的静止坐标系紫外光度学推导出来的。区分内在的紫外多样性和尘埃变红可以有重要的后果，确定宇宙学距离与休息帧紫外测光。这个紫外光谱系列是第一个来自HST的正常的，虽然变红，NUV红色的超新星Ia，并且对于分析本质上更红的NUV颜色的超新星Ia很重要。我们显示的模型比较表明，金属丰度可能是NUV-蓝色和NUV-红色SNe Ia之间的物理差异，来自3000 nm附近的反向荧光的发射峰意味着SN 2017 erp上层的金属丰度比SN 2011 fe高出10倍。然而，金属丰度估计值依赖于模型，紫外线有多种影响。需要进一步的模型和紫外光谱的超新星Ia探索的多样性，这似乎是独立的差异，在近紫外峰和中紫外通量水平。
We present space-based ultraviolet/optical photometry and spectroscopy with the Swift Ultra-Violet/Optical Telescope and Hubble Space Telescope (HST), respectively, along with ground-based optical photometry and spectroscopy and near-infrared spectroscopy of supernova SN 2017erp. The optical light curves and spectra are consistent with a normal SN Ia. Compared to previous photometric samples in the near-ultraviolet (NUV), SN 2017erp has UV colors that are redder than NUV-blue SNe Ia corrected to similar optical colors. The chromatic difference between SNe 2011fe and 2017erp is dominated by the intrinsic differences in the UV rather than the expected dust reddening. This chromatic difference is similar to the SALT2 color law, derived from rest-frame ultraviolet photometry of higher redshift SNe Ia. Differentiating between intrinsic UV diversity and dust reddening can have important consequences for determining cosmological distances with rest-frame ultraviolet photometry. This ultraviolet spectroscopic series is the first from HST of a normal, albeit reddened, NUV-red SN Ia and is important for analyzing SNe Ia with intrinsically redder NUV colors. We show model comparisons suggesting that metallicity could be the physical difference between NUV-blue and NUV-red SNe Ia, with emission peaks from reverse fluorescence near 3000 Å implying a factor of ∼10 higher metallicity in the upper layers of SN 2017erp compared to SN 2011fe. Metallicity estimates are very model dependent, however, and there are multiple effects in the UV. Further models and UV spectra of SNe Ia are needed to explore the diversity of SNe Ia, which show seemingly independent differences in the near-UV peaks and mid-UV flux levels.
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DOI：
10.1111/j.1365-2966.2012.21928.x
发表时间：
2012-08
影响因子：
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作者：
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10.3847/0004-637x/826/1/56
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2016-04
期刊：
The Astrophysical Journal
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发表时间：
2006-04
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