Surrogate light curve models for kilonovae with comprehensive wind ejecta outflows and parameter estimation for AT2017gfo
Surrogate light curve models for kilonovae with comprehensive wind ejecta outflows and parameter estimation for AT2017gfo
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DOI：
10.1103/physrevresearch.5.013168
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发表时间：
2022-11
影响因子：
4.2
通讯作者：
Atul Kedia;M. Ristić;R. O’Shaughnessy;A. Yelikar;R. Wollaeger;O. Korobkin;E. Chase;Chris L. Fryer;C. Fontes
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文献类型：
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作者：
Atul Kedia;M. Ristić;R. O’Shaughnessy;A. Yelikar;R. Wollaeger;O. Korobkin;E. Chase;Chris L. Fryer;C. Fontes
中子星星合并产生的电磁辐射已被证明在它们的光变曲线中编码了喷射物质的性质。从kilonova发射推断出的喷出物性质与基于引力波信号和数值相对论模型计算出的喷出物性质存在矛盾。出于这种紧张局势，我们构建了一个广泛的代理光变曲线模型kilonova喷出物。四参数家庭的二维各向异性模拟及其相关的代理探索不同的假设风外流形态和外流成分，保持动力学喷出物成分一致。我们提出了这些代理模型在不同喷出物参数间插值kilonova光变曲线的能力，并对AT2017gfo进行了参数估计，而无需对流出物进行任何假设，并假设流出物必须代表太阳r过程丰度模式。我们对AT2017gfo的参数估计表明，这些替代模型有助于缓解喷出物属性的差异，同时也说明了系统建模不确定性对这些属性的影响，敦促进一步研究。
The electromagnetic emission resulting from neutron star mergers have been shown to encode properties of the ejected material in their light curves. The ejecta properties inferred from the kilonova emission has been in tension with those calculated based on the gravitational wave signal and numerical relativity models. Motivated by this tension, we construct a broad set of surrogate light curve models derived for kilonova ejecta. The four-parameter family of two-dimensional anisotropic simulations and its associated surrogate explore different assumptions about the wind outflow morphology and outflow composition, keeping the dynamical ejecta component consistent. We present the capabilities of these surrogate models in interpolating kilonova light curves across various ejecta parameters and perform parameter estimation for AT2017gfo both without any assumptions on the outflow and under the assumption that the outflow must be representative of solar r-process abundance patterns. Our parameter estimation for AT2017gfo shows these surrogate models help alleviate the ejecta property discrepancy while also illustrating the impact of systematic modeling uncertainties on these properties, urging further investigation.