Exomoons as Sources of White Dwarf Pollution
Exomoons as Sources of White Dwarf Pollution
复制标题
DOI：
10.3847/1538-4357/ac86d5
复制
发表时间：
2022-05
期刊：
影响因子：
--
通讯作者：
Isabella L. Trierweiler;A. E. Doyle;C. Melis;K. Walsh;E. Young
中科院分区：
文献类型：
--
作者：
Isabella L. Trierweiler;A. E. Doyle;C. Melis;K. Walsh;E. Young
污染的白色矮星（WD）提供了一种独特的方法来研究系外行星物质的整体成分，但并不总是清楚这些物质是否来自彗星，小行星，卫星或行星。我们将联合收割机N体模拟与分析模型相结合，以评估太阳系外卫星作为WD污染源的普遍性。使用观测到的污染WD的样本，我们发现，外推的母体质量的污染物往往是更一致的许多太阳系的卫星，而不是太阳系的小行星。我们提供了一个框架，估计目前正在进行可观察到的月球吸积WD行星和月球系统的模拟结果的基础上的分数。聚焦于一个由超级地球到海王星质量的天体组成的三行星WD系统，我们发现我们可以预期大约有1%的这样的系统目前正在经历月球吸积，而不是小行星吸积。
Polluted white dwarfs (WDs) offer a unique way to study the bulk compositions of exoplanetary material, but it is not always clear if this material originates from comets, asteroids, moons, or planets. We combine N-body simulations with an analytical model to assess the prevalence of extrasolar moons as WD polluters. Using a sample of observed polluted WDs, we find that the extrapolated parent body masses of the polluters are often more consistent with those of many solar system moons, rather than solar-like asteroids. We provide a framework for estimating the fraction of WDs currently undergoing observable moon accretion based on results from simulated WD planetary and moon systems. Focusing on a three-planet WD system of super-Earth to Neptune-mass bodies, we find that we could expect about one percent of such systems to be currently undergoing moon accretions as opposed to asteroid accretion.