Stars with planets and the thick disc
Stars with planets and the thick disc
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有行星和厚圆盘的恒星
DOI：
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发表时间：
2009
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通讯作者：
G. González
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作者：
G. González
我们采用了附近恒星的三个样本（其中包括拥有多普勒探测到的行星的恒星）来测试 Haywood 最近的发现，即在 [Fe/H] ≤− 0.20 dex 范围内，过渡星和厚盘恒星中行星的发生率高于薄盘恒星中的行星发生率；这意味着距银河系中心的距离是行星形成的原因，而不是[Fe/H]。在[Fe/H]范围内，具有行星的厚盘恒星确实比薄盘恒星具有更小的平均[Fe/H]值，并且具有行星的最贫[Fe/H]恒星往往具有更负的V lsr 值。然而，如果我们根据对行星形成重要的难熔元素（Mg、Si、Fe）的质量丰度来比较恒星与行星，那么厚盘和[Fe/H]贫的薄盘恒星与行星具有相似的分布。没有必要调用巨行星形成的新机制来解释矮恒星中具有行星的恒星的分布。
We employ three samples of nearby stars that include stars hosting Doppler-detected planets to test a recent finding by Haywood that the incidence of planets is greater among transition and thick disc stars than it is among thin disc stars in the range [Fe/H] ≤− 0.20 dex; this implies that distance from the Galactic Centre is the causative factor for planet formation, not [Fe/H]. Thick disc stars with planets do have a smaller mean [Fe/H] value than thin disc stars over this range in [Fe/H], and the most [Fe/H]-poor stars with planets tend to have more negative V lsr values. However, if we compare stars with planets according to mass abundance of the refractory elements important for planet formation (Mg, Si, Fe), then thick disc and [Fe/H]-poor thin disc stars with planets have similar distributions. There is no need to invoke a new mechanism for giant planet formation to account for the distributions of stars with planets among dwarf stars.