发表机构
Inter-University Centre for Astronomy and Astrophysics（大学间天文与天体物理中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究针对偏心致密双星并合中视线加速度与轨道偏心率的简并问题，提出在波形模板中同时建模两种效应，并通过类似GW170817的注入实验证明该方法能在90%置信区间内准确恢复参数。
AI 中文摘要
视线加速度（LOSA）效应，由外部引力势在旋进致密双星的引力波（GW）信号中留下印记，是在单事件基础上探测致密双星环境的最有前景的手段之一。然而，该效应可能与其他低频效应，特别是双星的轨道偏心率，存在简并性。如果在波形模板中仅考虑LOSA效应或轨道偏心率之一（而非两者），则它们可能相互模仿。在本工作中，我们提出了由加速偏心致密双星引起的（2,2）模式、主导偏心谐波、频域相位修正，并讨论了文献中关于该相位修正的不一致之处。我们表明，如果在模板中对两种效应进行建模，则可以解决LOSA与轨道偏心率之间的简并性。为证明这一点，我们注入了一个类似GW170817的信号，并为其添加了偏心率与LOSA，然后假设LVK探测器网络的A+类噪声功率谱密度（PSD）来恢复注入信号的参数。我们发现，真实的LOSA和偏心率参数以及其他双星参数均在90%置信区间（CI）内被恢复。本研究强调了在偏心波形模型中纳入LOSA的重要性，以稳健可靠地估计LOSA和偏心率。
英文摘要
The line-of-sight acceleration (LOSA) effect, imprinted in the gravitational wave (GW) signal of an inspiralling compact binary by an external gravitational potential, is one of the most promising means of probing the environment of compact binaries on a single-event basis. However, this effect is potentially degenerate with other low-frequency effects, particularly the binary's orbital eccentricity. LOSA effects and orbital eccentricity can mimic each other if only one or the other (but not both) are accounted for in the waveform template. In this work, we present the (2, 2) mode, leading eccentric harmonic, frequency-domain phase correction incurred by an accelerating eccentric compact binary, and discuss inconsistencies pertaining to this phase correction in the literature. We show that the degeneracy between LOSA and orbital eccentricity can be resolved if both effects are modeled in the template. To demonstrate this, we inject a GW170817-like signal, with eccentricity and LOSA added to it, and recover the parameters of the injected signal assuming an A+ like noise power spectral density (PSD) of the LVK detector network. We find that the true LOSA and eccentricity parameters, along with other binary parameters, are recovered within the $90\%$ credible interval (CI). This study highlights the importance of incorporating LOSA in eccentric waveform models to robustly and reliably estimate LOSA and eccentricity.
