Abundance tomography of Type Iax SN 2011ay with tardis
Abundance tomography of Type Iax SN 2011ay with tardis
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DOI：
10.1093/mnras/stx1894
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发表时间：
2017-07
影响因子：
4.8
通讯作者：
B. Barna;T. Szalai;M. Kromer;W. E. Kerzendorf;J. Vinkó;J. Silverman;G. H. Marion;J. Wheeler
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文献类型：
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作者：
B. Barna;T. Szalai;M. Kromer;W. E. Kerzendorf;J. Vinkó;J. Silverman;G. H. Marion;J. Wheeler
我们对 Iax SN 2011ay 型进行了详细的光谱分析。我们的光谱涵盖了 B 波段最大光的 -3 到 +19 天之间的时期。这个时间范围使我们能够采用所谓的丰度断层扫描技术。合成光谱拟合是使用一维蒙特卡罗辐射传输代码 TARDIS 进行的。在本文中，我们描述了用自洽的分层大气模型拟合多个历元的方法。我们将我们的结果与之前发布的 SYN++ 模型以及不同爆炸场景的预测进行比较。使用固定密度分布（W7 的指数拟合），我们发现均匀丰度模型无法再现最大光之前的光谱特征，因为出现了过强的 Fe 谱线。在我们最适合的 TARDIS 模型中，我们发现丰度分布分为两个不同的区域：10,000 km s$^{-1}$ 以下的充分混合区域和 10,000 km s$^{-1}$ 以上 IGE 丰度递减的分层区域。基于详细的比较分析，我们的结论是，现有的纯爆燃模型无法完全解释 SN 2011ay 观察到的特性或我们的 TARDIS 建模结果。需要进一步检查才能找到该物体起源的充分解释。
We present a detailed spectral analysis of Type Iax SN 2011ay. Our spectra cover epochs between -3 and +19 days with respect to the maximum light in B-band. This time range allows us to employ a so-called abundance tomography technique. The synthetic spectral fitting was made with the 1D Monte Carlo radiative transfer code TARDIS. In this paper, we describe our method to fit multiple epochs with a self-consistent, stratified atmospheric model. We compare our results to previously published SYN++ models and the predictions of different explosion scenarios. Using a fixed density profile (exponential fit of W7), we find that a uniform abundance model cannot reproduce the spectral features before maximum light because of the emergence of excessively strong Fe lines. In our best-fit TARDIS model, we find an abundance profile that separated into two different regimes: a well-mixed region under 10,000 km s$^{-1}$ and a stratified region with decreasing IGE abundances above 10,000 km s$^{-1}$. Based on a detailed comparative analysis, our conclusion is that the available pure deflagration models cannot fully explain either the observed properties of SN 2011ay or the results of our TARDIS modeling. Further examinations are necessary to find an adequate explanation for the origin of this object.