发表机构
Yunnan Observatories, Chinese Academy of Sciences; University of Chinese Academy of Sciences; Department of Astronomy, School of Physics and Astronomy, Yunnan University（中国科学院云南天文台; 中国科学院大学; 云南大学物理与天文学院天文学系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
利用TESS高节奏测光对30颗SU UMa型矮新星进行系统分析，揭示超级驼峰A-B-C三阶段演化的普遍性，并发现两个异常系统及椭圆盘存活证据，验证了空间测光在激变变星研究中的优势。
AI 中文摘要
超级爆发和超级驼峰是SU UMa型激变变星的特征标志，然而，由于地面光度监测的局限性，超级驼峰演化行为的全部多样性仍然缺乏约束。本文报告了对凌日系外行星勘测卫星观测到的30颗SU UMa型矮新星进行的系统分析，涵盖了37次超级爆发事件。我们在29个系统中探测到连贯的超级驼峰信号——其中包括5次首次探测——并确定或改进了13个天体的轨道周期。高节奏光变曲线清晰地分辨出了典型的A-B-C三阶段超级驼峰周期演化。利用A阶段周期，我们推导了18个系统的动力学质量比，与已确立的激变变星演化轨迹一致。测得的B阶段周期导数与地面观测活动得到的数值范围相符，其中显著的正向漂移集中在短周期、低质量比系统中。重复的超级爆发产生了一致的演化模式，表明超级驼峰形态是一种内在的、可重复的性质。有两个系统打破了标准模板：RZ LMi显示出与经典进动理论不符的倒置阶段序列，而ASASSN-14kj没有表现出阶段演化，但具有连贯的长周期调制。三个系统在正常爆发期间持续存在的超级驼峰提供了直接证据，表明椭圆盘结构可以在其母超级爆发之后存活，揭示了热吸积与潮汐椭圆度循环之间的解耦。这些结果展示了天基测光在探测吸积盘动力学和测试跨越激变变星参数空间的进动模型方面的能力。
英文摘要
Superoutbursts and superhumps are characteristic signatures of SU UMa-type cataclysmic variables, yet the full diversity of superhump evolutionary behaviour remains poorly constrained owing to the limitations of ground-based photometric monitoring. Here we report a systematic analysis of 30 SU UMa-type dwarf novae observed with the Transiting Exoplanet Survey Satellite, covering 37 superoutburst events. We detect coherent superhump signals in 29 systems-including five first-time detections-and determine or refine orbital periods for 13 objects. The high-cadence light curves clearly resolve the canonical three-stage (A-B-C) superhump period evolution. Using Stage A periods, we derive dynamical mass ratios for 18 systems, consistent with established cataclysmic variable evolutionary tracks. The measured Stage B period derivatives match the range of values from ground-based campaigns, with prominent positive drifts concentrated in short-period, low-mass-ratio systems. Repeated superoutbursts yield consistent evolutionary patterns, demonstrating that superhump morphology is an intrinsic, repeatable property. Two systems break the standard template: RZ LMi shows an inverted stage sequence inconsistent with classical precession theory, while ASASSN-14kj exhibits no stage evolution but a coherent long-period modulation. Persistent superhumps during normal outbursts in three systems provide direct evidence that eccentric disk structures can survive beyond their parent superoutbursts, revealing a decoupling between thermal accretion and tidal eccentricity cycles. These results demonstrate the power of space-borne photometry for probing accretion disk dynamics and testing precession models across the cataclysmic variable parameter space.
