Detector configuration of DECIGO/BBO and identification of cosmological neutron-star binaries
Detector configuration of DECIGO/BBO and identification of cosmological neutron-star binaries
复制标题
DOI：
10.1103/physrevd.83.044011
复制
发表时间：
2011-01
影响因子：
5
通讯作者：
Kent Yagi;N. Seto
中科院分区：
文献类型：
--
作者：
Kent Yagi;N. Seto
计划中的星载引力波干涉仪DECIGO/BBO（分赫兹干涉仪引力波观测台/大爆炸观测台）的主要目标是原始引力波背景。然而，天体物理前景是存在的，其中，中子星双星的引力波是必须被识别和扣除的固体和强分量。在本文中，我们讨论了几何检测器配置更好地识别NS/NS二进制信号。作为第一步，我们分析估计的最小信噪比的二进制数的静态检测器配置，其特征在于可调的几何参数，并确定这些参数的最佳值。接下来，我们进行数值模拟，考虑到探测器运动的影响，并找到合理的协议与分析结果。我们表明，与标准网络形成的4个单位的三角形探测器，建议的BBO灵敏度将足以接收所有的NS/NS双星在z{<=}5与信噪比高于25的引力波。我们还讨论了DECIGO的前景识别所需的最低灵敏度。
The primary target for the planned space-borne gravitational wave interferometers DECIGO/BBO (Decihertz Interferometer Gravitational Wave Observatory/Big Bang Observer) is a primordial gravitational wave background. However there exist astrophysical foregrounds, and among them, gravitational waves from neutron-star (NS) binaries are the solid and strong component that must be identified and subtracted. In this paper, we discuss the geometry of detector configurations preferable for identifying the NS/NS binary signals. As a first step, we analytically estimate the minimum signal-to-noise ratios of the binaries for several static detector configurations that are characterized by adjustable geometrical parameters, and determine the optimal values for these parameters. Next we perform numerical simulations to take into account the effect of detector motions, and find reasonable agreements with the analytical results. We show that, with the standard network formed by 4 units of triangle detectors, the proposed BBO sensitivity would be sufficient in receiving gravitational waves from all the NS/NS binaries at z{<=}5 with signal-to-noise ratios higher than 25. We also discuss the minimum sensitivity of DECIGO required for the foreground identification.