Constraints on the neutron star equation of state from AT2017gfo using radiative transfer simulations
Constraints on the neutron star equation of state from AT2017gfo using radiative transfer simulations
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DOI：
10.1093/mnras/sty2174
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发表时间：
2018-11-01
影响因子：
4.8
通讯作者：
Smartt, Stephen J.
中科院分区：
文献类型：
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作者：
Coughlin, Michael W.;Dietrich, Tim;Smartt, Stephen J.
双中子星合并GW170817的探测，以及对整个光谱中电磁对应物的观测，开创了多传播器天文学的新纪元。在这项研究中，我们纳入了根据原子结构数据计算的与波长相关的不透明度和发射率，使我们能够对电磁瞬变AT2017gfo的测量光曲线和光谱进行建模。观测数据的最佳拟合是通过高斯过程回归得到的，这使得我们能够提供与GW170817有关的千诺瓦和源属性的后验样本。结合LIGO-Virgo科学合作测量的引力波信号的约束，我们给出了质量比Q小于或类似于1.38的90%上限，以及潮汐变形性(A)大于或类似于197的下界，这排除了足够软的状态方程。我们的分析是对更真实的千诺瓦模型的一种探索，并展示了引力波和电磁测量的结合如何允许对源参数和超核状态方程进行严格的约束。
The detection of the binary neutron star merger GW170817 together with the observation of electromagnetic counterparts across the entire spectrum inaugurated a new era of multimessenger astronomy. In this study, we incorporate wavelength-dependent opacities and emissivities calculated from atomic-structure data enabling us to model both the measured light curves and spectra of the electromagnetic transient AT2017gfo. Best fits of the observational data are obtained by Gaussian Process Regression, which allows us to present posterior samples for the kilonova and source properties connected to GW170817. Incorporating constraints obtained from the gravitational wave signal measured by the LIGO-Virgo Scientific Collaboration, we present a 90 per cent upper bound on the mass ratio q less than or similar to 1.38 and a lower bound on the tidal deformability of (A) over tilde greater than or similar to 197, which rules out sufficiently soft equations of state. Our analysis is a path-finder for more realistic kilonova models and shows how the combination of gravitational wave and electromagnetic measurements allow for stringent constraints on the source parameters and the supranuclear equation of state.