论文标题
白矮星球WD J0914+1914 b：潜在的岩石污染物？
The white dwarf planet WD J0914+1914 b: barricading potential rocky pollutants?
论文作者
论文摘要
最近据报道，一个冰巨星的行星绕着白色矮人WD J0914+1914绕着0.07 au的距离。在这种白矮人的光球中，岩石污染物的惊人的未检测与几乎所有已知的白矮星的行星系统的观察结果形成鲜明对比。在这里，我分析了外部现存的岩石小行星，巨石，鹅卵石和卵石的前景，因为这种特别年轻（13 Myr）的白色矮人的亮度相对较高，因此向内辐射越过行星。鹅卵石和鹅卵石从poynting-Robertson拖动到绕过地球太慢，但是巨石和小行星会受到更强的Yarkovsky效应。 In this paper, I (i) place lower limits on the timescales for these objects to reach the planet's orbit, (ii) establish 3 m as the approximate limiting radius above which a boulder drifts too slowly to avoid colliding with the planet, and (iii) compute bounds on the fraction of boulders which succeed in traversing mean motion resonances and the planet's Hill sphere to eventually pollute the star.总体而言，我发现该行星是反对辐射驱动的岩石污染的障碍，而不是促进的岩石污染，这表明未来的岩石污染物很可能源自遥远的散射事件。
An ice giant planet was recently reported orbiting white dwarf WD J0914+1914 at an approximate distance of 0.07 au. The striking non-detection of rocky pollutants in this white dwarf's photosphere contrasts with the observations of nearly every other known white dwarf planetary system. Here, I analyze the prospects for exterior extant rocky asteroids, boulders, cobbles and pebbles to radiatively drift inward past the planet due to the relatively high luminosity (0.1 L_Sun) of this particularly young (13 Myr) white dwarf. Pebbles and cobbles drift too slowly from Poynting-Robertson drag to bypass the planet, but boulders and asteroids are subject to the much stronger Yarkovsky effect. In this paper, I (i) place lower limits on the timescales for these objects to reach the planet's orbit, (ii) establish 3 m as the approximate limiting radius above which a boulder drifts too slowly to avoid colliding with the planet, and (iii) compute bounds on the fraction of boulders which succeed in traversing mean motion resonances and the planet's Hill sphere to eventually pollute the star. Overall, I find that the planet acts as a barrier against rather than a facilitator for radiatively-driven rocky pollution, suggesting that future rocky pollutants would most likely originate from distant scattering events.
