A Broad Grid of 2D Kilonova Emission Models
A Broad Grid of 2D Kilonova Emission Models
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DOI：
10.3847/1538-4357/ac0d03
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
R. Wollaeger;Chris L. Fryer;E. Chase;C. Fontes;M. Ristić;A. Hungerford;O. Korobkin;R. O’Shaughnessy;A. Herring
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文献类型：
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作者：
R. Wollaeger;Chris L. Fryer;E. Chase;C. Fontes;M. Ristić;A. Hungerford;O. Korobkin;R. O’Shaughnessy;A. Herring
根据它们致密残留物的特性和模型中包含的物理特性，中子星合并的模拟可以产生广泛的喷射特性。这种喷射物的特征，反过来，定义了千新星的发射。为了探索喷射物性质的影响，我们提出了一个双分量二维轴对称千新星模拟网格，该网格改变了质量、速度、形态和组成。每个组分的质量和速度分别在0.001到0.1 M⊙和0.05到0.3 c之间变化，涵盖了中子星合并文献的大部分结果范围。900个模型的集合被限制为具有强大r过程组成的环形低电子分数（Y e）喷射和具有两种可能组成的球形或叶状高Y e喷射。我们使用蒙特卡罗辐射传输代码SuperNu模拟这些模型，使用全套镧系元素和第四行元素不透明。我们研究了这些模型随参数变化的趋势，展示了它们如何与统计工具一起使用，并将模型的光曲线和光谱与GW170817的电磁对应物AT2017gfo进行了比较。
Depending upon the properties of their compact remnants and the physics included in the models, simulations of neutron star mergers can produce a broad range of ejecta properties. The characteristics of this ejecta, in turn, define the kilonova emission. To explore the effect of ejecta properties, we present a grid of two-component 2D axisymmetric kilonova simulations that vary mass, velocity, morphology, and composition. The masses and velocities of each component vary, respectively, from 0.001 to 0.1 M ⊙ and 0.05 to 0.3 c, covering much of the range of results from the neutron star merger literature. The set of 900 models is constrained to have a toroidal low electron fraction (Y e ) ejecta with a robust r-process composition and either a spherical or lobed high-Y e ejecta with two possible compositions. We simulate these models with the Monte Carlo radiative transfer code SuperNu using a full suite of lanthanide and fourth-row element opacities. We examine the trends of these models with parameter variation, show how they can be used with statistical tools, and compare the model light curves and spectra to those of AT2017gfo, the electromagnetic counterpart of GW170817.