为什么脉冲星行星罕见？
Why are pulsar planets rare?
摘要：
脉冲星计时观测揭示了只有几颗脉冲星周围的行星。我们认为，这些行星的稀有性主要是由于两个影响。首先，我们表明，最有可能的形成机制需要摧毁一个伴星。只有拥有合适伴星（具有极端质量比）的恒星才能形成行星。第二，虽然通常认为盘中的死区（低湍流区域）对于行星形成是必不可少的，但由于脉冲星的辐射，它在恒星周围的盘中很可能是罕见的。辐射强烈地加热磁盘的内部部分，将死区的内部边界推出去。我们认为，脉冲星行星的稀有性可以解释为这两个要求的低概率-一个非常低的质量的同伴和一个死区-得到满足。
英文摘要：
Pulsar timing observations have revealed planets around only a few pulsars. We suggest that the rarity of these planets is due mainly to two effects. First, we show that the most likely formation mechanism requires the destruction of a companion star. Only pulsars with a suitable companion (with an extreme mass ratio) are able to form planets. Second, while a dead zone (a region of low turbulence) in the disk is generally thought to be essential for planet formation, it is most probably rare in disks around pulsars because of the irradiation from the pulsar. The irradiation strongly heats the inner parts of the disk pushing the inner boundary of the dead zone out. We suggest that the rarity of pulsar planets can be explained by the low probability for these two requirements - a very low-mass companion and a dead zone - to be satisfied.
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