IW And-type dwarf novae are anomalous Z Cam stars featured with outbursts happening during standstill states, which are not expected in the standard disk instability model. The physical mechanisms for these variations remain unclear. In this study, we report the discovery of a new candidate IW And-type dwarf nova J0652+2436, identified with its frequent outbursts from the slowly rising standstill states. Luckily, the TESS observations during a long standstill state and the earlier K2 observations give a chance to find the orbital and negative superhump period in the light curve of J0652+2436, allowing the measurement of its mass ratio of 0.366. This mass ratio is marginally possible for the tidal instability to set in according to previous SPH simulations. Thus, we propose that the outbursts in J0652+2436 are likely to be caused by the growing accretion disk during standstills, in favor of the previous hypothesis of the mechanisms lying in all IW And stars. We conclude that J0652+2436 might be the first IW And star with both a precessing tilted disk and tidal instability, which will be an important laboratory for studying the accretion disk dynamics and help understand IW And phenomenon.

中文翻译：

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发现一颗新的IW And型矮新星，同时具有倾斜盘和潮汐不稳定性

IW And 型矮新星是异常 Z Cam 恒星，其特征是在静止状态下发生爆发，这在标准盘不稳定模型中是不会出现的。这些变化的物理机制仍不清楚。在这项研究中，我们报告了一颗新的候选 IW And 型矮新星 J0652+2436 的发现，该新星因其频繁从缓慢上升的静止状态爆发而被识别。幸运的是，长期静止状态下的TESS观测和早期的K2观测使我们有机会在J0652+2436的光变曲线中找到轨道和负超驼峰周期，从而可以测量到其质量比为0.366。根据之前的 SPH 模拟，这个质量比极有可能导致潮汐不稳定。因此，我们提出 J0652+2436 中的爆发很可能是由静止期间不断增长的吸积盘引起的，这支持了先前关于所有 IW 和 恒星中存在的机制的假设。我们得出结论，J0652+2436可能是第一颗同时具有进动倾斜盘和潮汐不稳定的IW And恒星，这将成为研究吸积盘动力学和帮助理解IW And现象的重要实验室。