The Challenges Ahead for Multimessenger Analyses of Gravitational Waves and Kilonova: A Case Study on GW190425
The Challenges Ahead for Multimessenger Analyses of Gravitational Waves and Kilonova: A Case Study on GW190425
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DOI：
10.3847/1538-4357/ac222d
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发表时间：
2021-02
期刊：
影响因子：
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通讯作者：
G. Raaijmakers;S. Nissanke;F. Foucart;M. Kasliwal;M. Bulla;R. Fernández;Amelia M. Henkel;T. Hinderer
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文献类型：
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作者：
G. Raaijmakers;S. Nissanke;F. Foucart;M. Kasliwal;M. Bulla;R. Fernández;Amelia M. Henkel;T. Hinderer
近年来，由于发现了第一个也是迄今为止唯一确认的引力波事件与同步电磁（EM）对应物，以及数值模拟，引力波（GW）探测器和瞬态天文学的改进，多信使天文学取得了重大进展。这导致了令人兴奋的可能性，执行联合分析的GW和EM数据，提供额外的约束的基本属性的二元祖和合并残余。在这里，我们提出了一个新的贝叶斯框架，允许推断这些属性，同时考虑到系统建模的不确定性，从GW二进制祖属性映射到光度光变曲线时出现的。我们扩展了Zackay等人提出的相对分箱方法，以包括用于GW信号的快速分析的外部GW参数。我们的EM框架的重点是在合并期间和合并后，在喷射物质中的r-过程核合成产生的光变曲线，所谓的kilonova，特别是在黑洞-中子星星系统。作为一个案例研究，我们研究了最近发现的GW 190425，其中的主要对象是一致的，无论是一个黑洞或中子星星。我们定量地展示了如何改进二进制祖先和流出属性之间的映射，和/或EM数据的数量和质量的增加，以打破退化的基本源参数。
In recent years, there have been significant advances in multimessenger astronomy due to the discovery of the first, and so far only confirmed, gravitational wave event with a simultaneous electromagnetic (EM) counterpart, as well as improvements in numerical simulations, gravitational wave (GW) detectors, and transient astronomy. This has led to the exciting possibility of performing joint analyses of the GW and EM data, providing additional constraints on fundamental properties of the binary progenitor and merger remnant. Here, we present a new Bayesian framework that allows inference of these properties, while taking into account the systematic modeling uncertainties that arise when mapping from GW binary progenitor properties to photometric light curves. We extend the relative binning method presented in Zackay et al. to include extrinsic GW parameters for fast analysis of the GW signal. The focus of our EM framework is on light curves arising from r-process nucleosynthesis in the ejected material during and after merger, the so-called kilonova, and particularly on black hole−neutron star systems. As a case study, we examine the recent detection of GW190425, where the primary object is consistent with being either a black hole or a neutron star. We show quantitatively how improved mapping between binary progenitor and outflow properties, and/or an increase in EM data quantity and quality are required in order to break degeneracies in the fundamental source parameters.