自诱导尘埃陷阱：克服行星形成障碍
Self-induced dust traps: overcoming planet formation barriers
摘要：
行星形成被认为发生在年轻恒星周围的圆盘中，由小尘埃颗粒聚集成大得多的物体。从颗粒到卵石，从星子到行星的生长过程现在已经相当清楚了。然而，发现中间阶段受到径向漂移和碎裂障碍的阻碍。我们确定了一个强大的机制，其中灰尘克服这两个障碍。它的关键成分是i）从尘埃到气体的逆反应，ii）晶粒生长和破碎，以及iii）大规模梯度。不断增长和破碎的颗粒堆积在一起，大规模地改变了气体结构，并引发了压力最大值的形成，颗粒被困在其中。我们表明，这些自诱导尘埃陷阱是强大的：他们开发了广泛的光盘结构，碎片阈值和初始的尘埃气体比。它们是鹅卵石成长为星子的最佳地点，从而为行星的形成开辟了新的道路。
英文摘要：
Planet formation is thought to occur in discs around young stars by the aggregation of small dust grains into much larger objects. The growth from grains to pebbles and from planetesimals to planets is now fairly well understood. The intermediate stage has however been found to be hindered by the radial-drift and fragmentation barriers. We identify a powerful mechanism in which dust overcomes both barriers. Its key ingredients are i) backreaction from the dust onto the gas, ii) grain growth and fragmentation, and iii) large-scale gradients. The pile-up of growing and fragmenting grains modifies the gas structure on large scales and triggers the formation of pressure maxima, in which particles are trapped. We show that these self-induced dust traps are robust: they develop for a wide range of disc structures, fragmentation thresholds and initial dust-to-gas ratios. They are favored locations for pebbles to grow into planetesimals, thus opening new paths towards the formation of planets.
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