论文标题
盖亚一世时代的白矮人与行星残余物：六个排放线系统
White dwarfs with planetary remnants in the era of Gaia I: six emission line systems
论文作者
论文摘要
具有气体碎屑盘排放线的白色矮人是行星残留宿主的最稀有例子之一，但与此同时，它们是研究行星系统最终进化阶段的关键对象。利用Gaia DR2中确定的大量白色矮人，我们正在对行星残留物进行调查，在这里，我们介绍了我们的搜索的第一个结果：六个带有气态碎屑盘的白矮人。第一个出版物的重点是这些对象的主要观察性属性，并突出了它们最独特的功能。特别是三个系统脱颖而出：WDJ084602.47+570328.64显示出异常强的红外过量，它违反了几何薄的，光学厚的尘土飞扬的碎屑盘的标准模型； WDJ213350.72+242805.93是最热的气态碎片盘宿主，teff = 29282 K;和WDJ052914.32-340108.11，其中我们从五个元素中确定了51个排放线的创纪录数。这些发现阐明了气体碎屑系统中的潜在多样性，并将这些对象的总数提高到21。通过这些数字，我们现在可以开始将这些系统的属性视为一类对象，而不是按照案例的基础。
White dwarfs with emission lines from gaseous debris discs are among the rarest examples of planetary remnant hosts, but at the same time they are key objects for studying the final evolutionary stage of planetary systems. Making use of the large number of white dwarfs identified in Gaia DR2, we are conducting a survey of planetary remnants and here we present the first results of our search: six white dwarfs with gaseous debris discs. This first publication focuses on the main observational properties of these objects and highlights their most unique features. Three systems in particular stand out: WDJ084602.47+570328.64 displays an exceptionally strong infrared excess which defies the standard model of a geometrically-thin, optically-thick dusty debris disc; WDJ213350.72+242805.93 is the hottest gaseous debris disc host known with Teff=29282 K; and WDJ052914.32-340108.11, in which we identify a record number of 51 emission lines from five elements. These discoveries shed light on the underlying diversity in gaseous debris disc systems and bring the total number of these objects to 21. With these numbers we can now start looking at the properties of these systems as a class of objects rather than on a case-by-case basis.
