AI 中文总结
研究利用SEOBNRv5EHM模拟注入信号，系统探究偏心率对中子星 - 黑洞参数估计的影响，发现如GW200105_162426系统，偏心率增加时，偏心率及相关参数测量精度提高，有效自旋和质量比约束改善，外在参数无显著变化。
AI 中文摘要
中子星 - 黑洞系统引力波探测为研究极端物质、限制双星形成通道及测试强引力下致密天体性质提供途径。信号中的偏心率特征可提升参数估计并暗示双星形成。本文用SEOBNRv5EHM模拟注入信号，系统研究偏心率对参数推断的影响。发现如GW200105_162426系统，偏心率增加时，偏心率及相关参数测量精度提高，最高偏心率\(e = 0.25\)时，\(1\sigma\)不确定度低至\(4\times10^{-4}\)，有效自旋\(\chi_\mathrm{eff}\)和质量比\(q\)的约束也改善。但光度距离和天空定位等外在参数无显著改善。
英文摘要
Detections of gravitational waves from neutron star-black hole systems provide avenues for studying extreme matter, constraining binary formation channels, and testing the nature of compact objects in strong gravity. Eccentric signatures in the signal further enhance this potential by improving parameter estimation and offering clues about binary formation. Because eccentricity is primarily imprinted during the inspiral phase, it is often weakly constrained or missed entirely in binary black hole observations; in contrast, neutron star-black hole systems produce longer in-band signals, enabling more precise measurements of eccentricity and leaving a distinct imprint on parameter inference. In this work, we present a systematic parameter-estimation study exploring the impact of eccentricity on inference using injections simulated with the state-of-the-art eccentric waveform model SEOBNRv5EHM. We find that for systems like GW200105_162426, the measurement precision of eccentricity and correlated parameters improves as eccentricity increases, yielding tighter constraints at larger eccentricities. For the highest eccentricity considered in this study, $e=0.25$, we recover eccentricity with $1σ$ uncertainty as low as $4\times10^{-4}$. In addition, the constraints on effective spin $χ_\mathrm{eff}$ and mass ratio $q$ improve relative to the quasi-circular case by factors of $\sim13$ and $\sim20$, respectively. On the other hand, we find no significant improvement in extrinsic parameters such as luminosity distance and sky localization, suggesting that for systems like GW200105_162426, the additional information provided by eccentricity in this sector is either negligible or degenerate with the information provided by higher-order modes.
