Close binary systems are the progenitors to both Type Ia supernovae and the compact object mergers that can be detected via gravitational waves. To achieve a binary with a small radial separation, it is believed that the system likely undergoes common envelope (CE) evolution. Despite its importance, CE evolution may be one of the largest uncertainties in binary evolution due to a combination of computational challenges and a lack of observed benchmarks where both the post-CE and pre-CE conditions are known. Identifying post-CE systems in star clusters can partially circumvent this second issue by providing an independent age constraint on the system. For the first time, we conduct a systematic search for white dwarf and main-sequence binary systems in 299 Milky Way open star clusters. Coupling Gaia DR3 photometry and kinematics with multiband photometry from Pan-STARRS1 and the Two Micron All Sky Survey, we apply a machine learning-based approach and find 52 high-probability candidates in 38 open clusters. For a subset of our systems, we present follow-up spectroscopy from the Gemini and Lick Observatories and archival light curves from the Transiting Exoplanet Survey Satellite, Kepler/K2, and the Zwicky Transient Facility. Examples of M dwarfs with hot companions are spectroscopically observed, along with regular system variability. While the kinematics of our candidates are consistent with their host clusters, some systems have spatial positions offset relative to their hosts, potentially indicative of natal kicks. Ultimately, this catalog is a first step to obtaining a set of observational benchmarks to better link post-CE systems to their pre-CE progenitors.

中文翻译：

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疏散星团中候选白矮星-主序双星的第一个目录：了解常见包络演化的新窗口


紧密双星系统是 Ia 型超新星和可以通过引力波探测到的致密天体合并的祖先。为了实现具有小径向间隔的二进制，人们认为该系统可能会经历公共包络 （CE） 演变。尽管 CE 进化很重要，但它可能是二进制进化中最大的不确定性之一，因为计算挑战和缺乏观察到的基准，其中 CE 后和 CE 前条件都已知。在星团中识别后 CE 系统可以通过为系统提供独立的年龄限制来部分规避第二个问题。我们首次在 299 个银河系疏散星团中对白矮星和主序双星系统进行了系统搜索。将 Gaia DR3 光度学和运动学与来自 Pan-STARRS1 和 Two Micron All Sky Survey 的多波段光度学相结合，我们应用基于机器学习的方法，在 38 个疏散星团中找到 52 个高概率候选者。对于我们系统的子集，我们展示了来自 Gemini 和 Lick 天文台的后续光谱学，以及来自凌日系外行星巡天卫星、开普勒/K2 和兹维基瞬态设施的存档光曲线。通过光谱学观察了带有热伴星的 M 矮星的例子，以及规则的系统变化。虽然我们的候选星系的运动学与它们的宿主集群一致，但一些系统的空间位置相对于它们的宿主有偏移，这可能表明本命的刺激。最终，该目录是获得一组观察基准的第一步，以更好地将 CE 后系统与其 CE 前祖先联系起来。