标题： PEWDD：富含exo行星物质的白矮数据库 显示英文标题

标题： PEWDD: A database of white dwarfs enriched by exo-planetary material

摘要： 我们介绍了行星富集白矮星数据库（PEWDD），这是一个收集了已发表的白矮星光球层丰度以及与金属富集和红外过量、发射线和伴星存在相关的信息的集合，这些白矮星正在吸积行星碎片。 PEWDD在发布时包含了1739颗白矮星的信息，并且会根据新的出版物不断更新。 记录了总共24种光球层金属，并将其与系外行星物质的吸积联系起来。 金属富集白矮星的整体性质受到观测选择效应的严重影响；特别是我们发现可检测到的金属强烈依赖于有效温度。 通过考虑用不同方法测量丰度的金属富集白矮星，我们发现这种差异与经常引用的经验估计丰度不确定性相当，即约0.1-0.2 dex。 我们注意到，在金属富集的H和He主导的白矮星之间，中位吸积率存在二分法，当从地球整体Ca丰度推断整体成分时，M_{接受, H} = 7.7e7克/秒，M_{接受, 亥姆霍兹} = 8.7e8克/秒。 我们在双星系统中识别出40颗金属富集的白矮星，并发现证据表明，在200天文单位内的伴星会抑制富集现象。 显示英文摘要

摘要： We present the Planetary Enriched White Dwarf Database (PEWDD), a collection of published photospheric abundances of white dwarfs accreting planetary debris alongside additional information relevant to metal-enrichment and the presence of infrared excesses, emission lines, and binary companions. PEWDD contains at the time of publishing information on 1739 white dwarfs and will be kept up-to-date with information from new publications. A total of 24 photospheric metals are recorded and are linked to accretion of exo-planetary material. The overall properties of metal-enriched white dwarfs are severely affected by observational selection effects; in particular we find that what metals are detectable strongly correlates with the effective temperature. By considering metal-enriched white dwarfs which have abundances measured by different methods, we find a spread that is comparable with the often quoted ad-hoc estimated abundance uncertainties, i.e. ~0.1-0.2dex. We draw attention to a dichotomy in the median accretion rates for metal-enriched H- and He-dominated white dwarfs, with M_{acc, H} = 7.7e7g/s and M_{acc, He} = 8.7e8g/s when extrapolating bulk compositions from bulk Earth Ca abundance. We identify 40 metal-enriched white dwarfs in binary systems and find evidence that enrichment is suppressed by binary companions within 200au.