论文标题
WD J0914+1914中粒子的短期稳定性
Short-term stability of particles in the WD J0914+1914 white dwarf planetary system
论文作者
论文摘要
几乎所有已知的白色矮人行星系统都包含恒星光球中可检测到的岩石碎片。一个明显的例外是年轻且仍在不断发展的白色矮人WD J0914+1914，它具有一个巨大的行星和纯气盘。该光盘的稳定边界以及对岩石污染的白色矮人的未来前景取决于地球的质量和轨道，这仅受到微弱约束。在这里，我们结合了一个合理的行星轨道和质量的合奏，以确定观察者当前期望在哪里找到气盘的外边界。我们这样做是通过对整个合理的相位空间进行短期数字集成的扫描。我们还证明了粒子星碰撞轨迹，这将导致岩石金属污染的（看不见的）特征，仅占相位空间的一小部分，主要限于粒子偏心率高于0.75。我们的分析表明，近圆形轨道上高度膨胀的行星是行星的类型，它与当前的观测值最为一致。
Nearly all known white dwarf planetary systems contain detectable rocky debris in the stellar photosphere. A glaring exception is the young and still evolving white dwarf WD J0914+1914, which instead harbours a giant planet and a disc of pure gas. The stability boundaries of this disc and the future prospects for this white dwarf to be polluted with rocks depend upon the mass and orbit of the planet, which are only weakly constrained. Here we combine an ensemble of plausible planet orbits and masses to determine where observers should currently expect to find the outer boundary of the gas disc. We do so by performing a sweep of the entire plausible phase space with short-term numerical integrations. We also demonstrate that particle-star collisional trajectories, which would lead to the (unseen) signature of rocky metal pollution, occupy only a small fraction of the phase space, mostly limited to particle eccentricities above 0.75. Our analysis reveals that a highly inflated planet on a near-circular orbit is the type of planet which is most consistent with the current observations.
