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arXiv 1202.0756astro-ph.SRastro-ph.CO
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IIP型超新星2007 od的光球光谱定量分析

Quantitative Photospheric Spectral Analysis of the Type IIP Supernova 2007od

C. Inserra, E. Baron, M. Turatto

摘要:

我们比较和分析的光谱观测的时间序列,在第一个30天的SN 2007od与非LTE代码PHOENIX的演变。尽管在巴尔末特征中存在一些光谱特性,但这颗超新星似乎是一颗正常的II型超新星,并且所提出的拟合与观测结果基本一致。作为一个起点,我们进行了分析与参数化的合成光谱代码SYNOW确认线识别和突出的两个代码的结果之间的差异。用PHOENIX计算的分析表明,Hβ中存在高速特征,而Hα剖面的密度剖面比其它元素的密度剖面陡。我们还详细分析了6个合成光谱的离子速度。用谱拟合扩展大气方法(SEAM)估计每个历元的距离。一致的结果发现,使用所有的光谱,给出爆炸日期JD 2454403(2007年10月29日)和距离模量μ= 32.2 \pm 0.3。

英文摘要:

We compare and analyze a time series of spectral observations obtained during the first 30 days of evolution of SN 2007od with the non-LTE code PHOENIX. Despite some spectroscopic particularities in the Balmer features, this supernova appears to be a normal Type II, and the fits proposed are generally in good agreement with the observations. As a starting point we have carried out an analysis with the parameterized synthetic spectrum code SYNOW to confirm line identifications and to highlight differences between the results of the two codes. The analysis computed using PHOENIX suggests the presence of a high velocity feature in Hβ and an Hα profile reproduced with a density profile steeper than that of the other elements. We also show a detailed analysis of the ions velocities of the 6 synthetic spectra. The distance is estimated for each epoch with the Spectral-fitting Expanding Atmosphere Method (SEAM). Consistent results are found using all the spectra which give the explosion date of JD 2454403 (29 October, 2007) and a distance modulus μ= 32.2 \pm 0.3.

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