造父γ星盘截断与行星形成
Disk Truncation and Planet Formation in gamma Cephei
摘要：
$γ$仙王座系统是迄今为止已知的最紧密结合的双行星宿主之一。行星母星（$γ$ Cep A）的伴星（$γ$ Cep B）应该截断了$γ$ Cep A周围的原行星盘，可能限制了盘中的行星形成。我们探讨这个问题，通过计算截断半径的原行星盘模型周围的$γ$ Cep A，以确定是否有足够的物质留在磁盘形成一颗行星。我们改变吸积率和粘度参数的磁盘模型，以涵盖一系列合理的可能性的磁盘属性和确定的吸积率$\geq 10^{-7}$ M $_{\sun}$ /年和低粘度参数，足够的物质在气体和固体存在的行星形成通过核心吸积是可能的。盘不稳定性是不太有利的，因为这只能发生在最大质量的盘模型与极高的吸积率。
英文摘要：
The $γ$ Cephei system is one of the most closely bound binary planet hosts known to date. The companion ($γ$ Cep B) to the planet-hosting star ($γ$ Cep A) should have truncated any protoplanetary disk around $γ$ Cep A, possibly limiting planet formation in the disk. We explore this problem by calculating the truncation radii of protoplanetary disk models around $γ$ Cep A to determine whether or not there is sufficient material remaining in the disk to form a planet. We vary the accretion rate and viscosity parameter of the disk models to cover a range of reasonable possibilities for the disks properties and determine that for accretion rates of $\geq 10^{-7}$ M$_{\sun}$/yr and low viscosity parameter, sufficient material in gas and solids exist for planet formation via core accretion to be possible. Disk instability is less favored, as this can only occur in the most massive disk model with an extremely high accretion rate.
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