标题： 球状星团中的行星？ 显示英文标题

标题： Planets in Globular Clusters?

摘要： PSR 1257+12周围行星的发现表明，可能在球状星团中发现的再加工脉冲星周围也能探测到行星系统。 密集星团中的行星系统由于经过的恒星的扰动，其寿命会因解体而受到限制，这种解体时间与脉冲星的寿命相当甚至更短，因此在星团核心观测到的行星可能会显示出在比系统特征年龄（$\tau_c$）短得多的时间尺度上形式上动力学不稳定的行星系统。 在星团脉冲星周围形成的行星很可能局限于半长轴为$\sim 0.1-1.0\, AU$的范围内，而“掠夺”来的行星可能在更宽的轨道上被观测到，在最稠密的星团中预计不会形成稳定的系统。 最有可能在富含星团的高密度预坍缩核心星团中进行观测，例如47 Tuc。 围绕星团脉冲星的行星探测可以限制行星形成机制，特别是低金属丰度对盘中行星形成的影响。 显示英文摘要

摘要： The discovery of planets around PSR~1257+12 suggests that planetary systems may be detected around the recycled pulsars found in globular clusters. Planetary systems in dense clusters have lifetimes to disruption due to perturbations by passing stars comparable to or shorter than the pulsar lifetime, and observations of planets in the cores of clusters may reveal planetary systems formally dynamically unstable on time scales short compared to the characteristic age, $\tau_c$, of the system. Planets formed around cluster pulsars will most likely be restricted to semi--major axis of $\sim 0.1-1.0\, AU$, while "scavenged" planets may be observed in wider orbits, with no stable systems expected in the densest clusters. Observation is most probable in the cluster rich high--density pre-core collapse clusters such as 47Tuc. Detection of planets around cluster pulsars can constrain planet formation mechanisms, in particular the effects of low metallicity on planet formation in disks.