标题： 脉冲星行星：类地行星形成的一个案例 显示英文标题

标题： The Pulsar Planets: A Test Case of Terrestrial Planet Assembly

摘要： 我们在毫秒脉冲星B1257+12周围的行星系统形成的各种情景所建议的条件下，对从行星胚胎组装行星进行建模。 我们发现最可能的模型位于所提出范围的低角动量端。 涉及超新星回落的模型会产生这样的盘，尽管我们发现由太阳成分组成的盘比主要由重元素组成的盘更可能演化。 此外，我们发现当盘冷却时，尘埃沉降必须迅速发生，以便固态物质被限制在一个足够窄的半径范围内。 观测结果与最佳拟合模型之间的定量比较显示，模拟可以再现观测到的偏心率和质量，但在再现脉冲星行星系统的紧凑性方面存在困难。 最后，我们检查了对太阳系类地行星积累的类似研究结果，并讨论了通过比较可以学到什么。 显示英文摘要

摘要： We model the assembly of planets from planetary embryos under the conditions suggested by various scenarios for the formation of the planetary system around the millisecond pulsar B1257+12. We find that the most likely models fall at the low angular momentum end of the proposed range. Models that invoke supernova fallback produce such disks, although we find that a solar composition disk produces a more likely evolution than one composed primarily of heavy elements. Furthermore, we find that dust sedimentation must occur rapidly as the disk cools, in order that the solid material be confined to a sufficiently narrow range of radii. A quantitative comparison between the observations and the best-fit models shows that the simulations can reproduce the observed eccentricities and masses, but have difficulty reproducing the compactness of the pulsar planet system. Finally, we examine the results of similar studies of solar system terrestrial planet accumulation and discuss what can be learned from the comparison.