We present a model for the in situ assembly of planetary systems around a0.5~$M_{\odot}$ star, and compare the resulting statistics to the observedsample of cool Kepler planet candidates from Dressing & Charbonneau (2013). Weare able to reproduce the distribution of planetary periods and period ratios,although we once again find an underabundance of single transit systemsrelative to the observations. We also demonstrate that almost every planetarysystem assembled in this fashion contains at least one planet in the habitablezone, and that water delivery to these planets can potentially produce a watercontent comparable to that of Earth. Our results broadly support the notionthat habitable planets are plentiful around M~dwarfs in the solarneighbourhood.
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机译：我们提出了一个在0.5〜$ M _ {\ odot} $恒星周围的行星系统原位组装的模型，并将所得统计数据与Dressing＆Charbonneau（2013）观测到的凉爽开普勒行星候选样本进行了比较。尽管我们再次发现相对于观测而言，单一的过境系统数量不足，但我们能够再现行星周期和周期比率的分布。我们还证明，几乎所有以此方式组装的行星系统都在宜居带中至少包含一颗行星，并且向这些行星输送的水可能产生的水含量与地球相当。我们的结果广泛支持以下观点：在太阳区，宜居行星在M〜矮星附近。
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