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arXiv 2202.05802astro-ph.HEgr-qc
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利用引力辐射的高次模改进紧凑双星合并的光度距离和轨道倾角的预警估计

Improved early-warning estimates of luminosity distance and orbital inclination of compact binary mergers using higher modes of gravitational radiation

Mukesh Kumar Singh, Divyajyoti, Shasvath J. Kapadia, Md Arif Shaikh, Parameswaran Ajith

摘要:

合并前(早期预警)引力波(GW)检测和定位紧凑的双星合并将使天文学家能够在合并时捕获潜在的电磁(EM)辐射,从而揭示合并的复杂物理学。虽然早期探测和天空定位对于多信使事件的后续行动至关重要,但改进对光度距离和轨道倾角的估计也可以提供对EM发射可观测性的见解。在这项工作中,我们证明,包括更高的模式的引力辐射,振动在更高的倍数的轨道频率比占主导地位的模式,将显着提高的亮度距离和轨道倾角的二进制earlywarning估计。这将有助于天文学家更好地确定他们的后续战略。着眼于未来地面GW探测器网络的观测运行[LIGOVirgo-KAGRA,Voyager和第三代(3G)探测器的O 5运行],我们表明,对于跨越中子星黑洞双星的质量范围,这些双星可能是EM明亮的,包含了更高的模式,使光度距离的估计提高了1 - 1.5倍(1.1 - 2)[1.1 - 5]对于O 5(旅行者)[3G]观测方案,位于100 Mpc的源在合并前45(45)[300]秒。在轨道倾角估计方面也有重大改进。我们还研究了这些改进与不同的天空位置和偏振角。结合光度距离的不确定性与定位天空面积的估计,我们发现,在O 5(旅行者号)[3G]中,在预警时间为45(45)[300]秒时,包含更高的模式,定位体积内的星系数量减少了约1 - 2.5(1.2 - 4)[1.2 - 10]倍。

英文摘要:

The pre-merger (early-warning) gravitational-wave (GW) detection and localization of a compact binary merger would enable astronomers to capture potential electromagnetic (EM) emissions around the time of the merger, thus shedding light on the complex physics of the merger. While early detection and sky localization are of primary importance to the multimessenger follow-up of the event, improved estimates of luminosity distance and orbital inclination could also provide insights on the observability of the EM emission. In this work, we demonstrate that the inclusion of higher modes of gravitational radiation, which vibrate at higher multiples of the orbital frequency than the dominant mode, would significantly improve the earlywarning estimates of the luminosity distance and orbital inclination of the binary. This will help astronomers to better determine their follow-up strategy. Focusing on future observing runs of the ground-based GW detector network [O5 run of LIGOVirgo-KAGRA, Voyager, and third-generation (3G) detectors], we show that for a range of masses spanning the neutron-star black-hole binaries that are potentially EM-bright, the inclusion of higher modes improve the luminosity distance estimates by a factor of ~ 1 - 1.5 (1.1 - 2) [1.1 - 5] for the O5 (Voyager) [3G] observing scenario, 45 (45) [300] seconds before the merger for the sources located at 100 Mpc. There are significant improvements in orbital inclination estimates as well. We also investigate these improvements with varying sky-location and polarization angle. Combining the luminosity distance uncertainties with localization skyarea estimates, we find that the number of galaxies within localization volume is reduced by a factor of ~ 1 - 2.5 (1.2 - 4) [1.2 - 10] with the inclusion of higher modes at early-warning time of 45 (45) [300] seconds in O5 (Voyager) [3G].

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