论文标题
在小型影响火山口的白色矮人行星系统中生成金属污染碎片
Generating metal-polluting debris in white dwarf planetary systems from small-impact crater ejecta
论文作者
论文摘要
白色矮人光传出中的金属污染源于行星，月亮，小行星，彗星，巨石，卵石和灰尘的某种组合。当大物体驻留在动态停滞的位置时 - 无法污染甚至接近白矮人 - 较小的撞击碎片储层可能成为互补的金属污染物的互补或主要来源。在这里，我们通过计算后坐力质量的限制来探索这种可能性的第一步，从而在无大气层表面上造成了反冲物质量的限制，从而逃脱了目标对象的重力。通过仅考虑Kurosawa＆Takada（2019）的全链分析处方，我们为玄武岩，花岗岩，铁，铁和水上富含水的目标对象提供了垂直影响，我们为Radii范围10^{0-3} km提供了质量。我们使用全链处方而不是物理实验或氢化模拟，使我们能够快速采样适合白矮人行星系统的广泛参数空间。我们的数值结果可以在以后的研究中使用，以限制白色矮人周围新鲜生成的小碎片储层，鉴于特定的行星系统体系结构，轰炸历史和影响几何形状。
Metal pollution in white dwarf photospheres originates from the accretion of some combination of planets, moons, asteroids, comets, boulders, pebbles and dust. When large bodies reside in dynamically stagnant locations -- unable themselves to pollute nor even closely approach the white dwarf -- then smaller reservoirs of impact debris may become a complementary or the primary source of metal pollutants. Here, we take a first step towards exploring this possibility by computing limits on the recoil mass that escapes the gravitational pull of the target object following a single impact onto an atmosphere-less surface. By considering vertical impacts only with the full-chain analytical prescription from Kurosawa & Takada (2019), we provide lower bounds for the ejected mass for basalt, granite, iron and water-rich target objects across the radii range 10^{0-3} km. Our use of the full-chain prescription as opposed to physical experiments or hydrocode simulations allows us to quickly sample a wide range of parameter space appropriate to white dwarf planetary systems. Our numerical results could be used in future studies to constrain freshly-generated small debris reservoirs around white dwarfs given a particular planetary system architecture, bombardment history, and impact geometries.
