标题： 四颗新的深度掩食白矮星在ZTF中被发现 显示英文标题

标题： Four new deeply-eclipsing white dwarfs in ZTF

摘要： 我们展示了在ZTF数据发布4中对深深掩食白矮星的搜索结果。我们识别出九个深深的掩食白矮星候选体，其中四个通过高采样率的光度测量和光谱观测进行了后续跟踪。这三个系统在ZTF数据和我们的后续APO 3.5米望远镜观测中显示出全蚀现象。尽管掩食时长与次恒星伴星一致，但我们的分析显示，这四个系统都包含一个低质量恒星伴星约为0.1倍太阳质量的白矮星。基于我们的光度和光谱拟合，我们提供了每个系统中两颗恒星的质量和半径限制。最后，我们列出了在ZTF数据发布7的初步搜索中识别出的额外41个掩食白矮星加M型恒星候选体，其中包括12个之前已研究过的系统。根据PanSTARRS颜色，我们在41个白矮星加M型恒星候选体样本中确定了两个新的短周期、掩食型白矮星-褐矮星双星候选体。 显示英文摘要

摘要： We present the results of a search for deeply-eclipsing white dwarfs in the ZTF Data Release 4. We identify nine deeply-eclipsing white dwarf candidates, four of which we followed up with high-cadence photometry and spectroscopy. Three of these systems show total eclipses in the ZTF data and our follow-up APO 3.5-meter telescope observations. Even though the eclipse duration is consistent with sub-stellar companions, our analysis shows that all four systems contain a white dwarf with low-mass stellar companions of ~0.1 Msol. We provide mass and radius constraints for both stars in each system based on our photometric and spectroscopic fitting. Finally, we present a list of 41 additional eclipsing WD+M candidates identified in a preliminary search of ZTF DR7, including 12 previously studied systems. We identify two new candidate short-period, eclipsing, white dwarf-brown dwarf binaries within our sample of 41 WD+M candidates based on PanSTARRS colors.