AI 中文总结
本文对11个质量比低于0.15的极低质量比相接双星开展测光与光谱研究，利用PHysics Of Eclipsing BinariEs模型等分析，揭示其轨道周期变化等特性并探讨形成机制。
AI 中文摘要
我们对11个总食相接双星开展了测光与光谱研究，这些系统的质量比低于0.15，被归类为极低质量比相接双星。利用地基多波段光变曲线，通过PHysics Of Eclipsing BinariEs（食双星物理）模型推导这些系统的测光参数；J011323和J002747的TESS光变曲线呈现明显不对称性与连续变化，马尔可夫链蒙特卡罗建模表明这些变化与主星上黑子的纵向迁移有关。对LAMOST光谱的谱线扣除显示，6个系统存在色球发射超量，其余5个未检测到可探测的超量发射；O-C分析表明，6个系统的轨道周期长期增加，5个长期减小。我们估算了这些系统的轨道角动量并开展动力学分析，在采用的无能量转移半解析框架内，观测到的这些系统的形成需要超出饱和磁制动和引力辐射的额外角动量损失，但该要求可通过质量转移或半径演化的不同假设进行调整。
英文摘要
We present photometric and spectroscopic investigations of 11 totally eclipsing contact binaries with mass ratios below 0.15, classifying them as extremely low mass ratio contact binaries. The ground-based multiband light curves were modeled with PHysics Of Eclipsing BinariEs to derive the photometric parameters of these systems. The TESS light curves of J011323 and J002747 show pronounced asymmetries and continuous variations. Markov Chain Monte Carlo modeling suggests that these variations are related to longitudinal migration of spots on the primary components. Spectral subtraction of the LAMOST spectra reveals excess chromospheric emission in six systems, while no detectable excess emission is found in the other five. The O$-$C analysis indicates secular period increases in six systems and secular decreases in five systems. We estimated their orbital angular momenta and performed a dynamical analysis. {Within our adopted semi-analytical framework without energy transfer, the formation of these observed systems requires additional angular momentum loss beyond saturated magnetic braking and gravitational radiation, but this requirement could be modified by different assumptions on mass transfer or radius evolution.
Comments20 pages, 7 figures, 7 tables, accepted by ApJ
