为什么这么少的热水壶？
Why are there so few hot Jupiters?
摘要：
我们使用数值模拟来模拟小半径大质量行星的迁移，并将结果与已知的“热行星”（半长轴a < 0.1 AU的太阳系外行星）的性质进行比较。对于质量Mp sin i > 0.5 MJup的行星，在小半径处任何“堆积”的证据都很弱（统计上不显著），尽管与位于更远处的参考样本相比，热彗星的质量函数在高质量行星中是不足的，但小样本量排除了明确的结论。我们认为，这些属性是一致的磁盘迁移进入磁层腔靠近恒星。进入空腔导致迁移减慢，伴随着轨道偏心率的增长。对于质量超过1个木星质量的行星，我们发现离心率增长的时间尺度为几× 10^5年，这表明这些行星可能经常被迅速摧毁。大质量行星的偏心率增长似乎更快，这可能解释了小半径行星质量函数的变化，也可能预测了低质量行星的堆积，其样本仍然不完整。
英文摘要：
We use numerical simulations to model the migration of massive planets at small radii and compare the results with the known properties of 'hot Jupiters' (extrasolar planets with semi-major axes a < 0.1 AU). For planet masses Mp sin i > 0.5 MJup, the evidence for any `pile-up' at small radii is weak (statistically insignificant), and although the mass function of hot Jupiters is deficient in high mass planets as compared to a reference sample located further out, the small sample size precludes definitive conclusions. We suggest that these properties are consistent with disc migration followed by entry into a magnetospheric cavity close to the star. Entry into the cavity results in a slowing of migration, accompanied by a growth in orbital eccentricity. For planet masses in excess of 1 Jupiter mass we find eccentricity growth timescales of a few x 10^5 years, suggesting that these planets may often be rapidly destroyed. Eccentricity growth appears to be faster for more massive planets which may explain changes in the planetary mass function at small radii and may also predict a pile-up of lower mass planets, the sample of which is still incomplete.
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