Abstract Cataclysmic Variables (CVs) are binaries in which a white dwarf accretes from a low-mass companion star. CVs are the best-suited laboratories to test our understanding of the evolution of compact, interacting binaries as they are numerous, relatively bright, and both stellar components are structurally simple. Nonetheless, while a large fraction ( ≃ 40 - 80 % ) of the present-day Galactic CV population is expected to be old, highly evolved and to host brown dwarf companions, yet very few of these so-called “period bouncers” have been identified so far. The lack of these systems in the observed Galactic CV population possibly suggests that the physical mechanisms driving CV evolution (such as the common envelope phase, the mechanisms of angular momentum loss and/or the response of the companions to the mass loss) are still not completely understood. The Compact binary HIgh CAdence Survey (CHiCaS) is a high cadence photometric survey performing three hours of uninterrupted time series photometry at one minute cadence over 136 square degrees of sky with JAST/T80Cam. CHiCaS aims to unambiguously identify the predicted large population of period-bounce CVs via detection of binary eclipses, thus providing an observational support for the current evolutionary models of all kind of compact binaries, such as black hole binaries, X-ray transients, double degenerates or SN Ia progenitors. Moreover, CHiCaS will deliver high cadence light curves along with full-colour information for about 2.5 million sources, thus identifying several hundred thousand variable stars, including eclipsing and contact binaries, pulsating and flaring stars, which will provide a significant legacy value.

中文翻译：

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紧凑型二进制高 CAdence 调查 (CHiCaS)：概述

摘要 Cataclysmic Variables (CVs) 是一颗白矮星从低质量伴星中吸积而成的双星。CV 是测试我们对紧凑、相互作用的双星演化的理解的最合适的实验室，因为它们数量众多、相对明亮，并且两个恒星成分在结构上都很简单。尽管如此，虽然目前银河系 CV 人口的很大一部分（≃ 40 - 80 %）预计年龄较大、高度进化并拥有褐矮星伴星，但这些所谓的“周期保镖”中很少有鉴定到此为止。在观测到的银河 CV 群体中缺乏这些系统可能表明驱动 CV 演化的物理机制（例如共同包络相，角动量损失的机制和/或同伴对质量损失的反应）仍未完全了解。紧凑型二进制高 CAdence 测量 (CHiCaS) 是一种高节奏光度测量，使用 JAST/T80Cam 在 136 平方度的天空上以一分钟的节奏执行三小时不间断的时间序列光度测量。CHiCaS 旨在通过检测双星日食明确识别预测的大量周期反弹 CV，从而为各种紧凑双星的当前演化模型提供观测支持，例如黑洞双星、X 射线瞬变、双退化或 SN Ia 祖细胞。此外，CHiCaS 将为大约 250 万个光源提供高节奏光曲线和全彩色信息，从而识别数十万颗变星，