来自HARPS GTO行星搜索计划的451颗恒星的化学丰度：薄盘、厚盘和行星
Chemical abundances of 451 stars from the HARPS GTO planet search program: Thin disc, thick disc, and planets
摘要：
我们提出了一个统一的研究12种元素（Si，Ca，Sc，Ti，V，Cr，Mn，Co，Ni，Na，Mg和Al）的化学丰度来自451颗恒星的光谱作为HARPS GTO行星搜索计划的一部分。其中68颗是行星轴承恒星。我们工作的主要目标是：i）调查有行星和没有行星的恒星丰度之间可能存在的差异; ii）研究薄盘和厚盘中恒星丰度的可能差异。我们确认，有一个系统较高的金属含量的行星宿主恒星相比，非行星主机，共同所有研究的物种。我们还发现，有和没有行星的恒星的星系化学演化趋势没有区别。拥有行星伴星的恒星似乎只是处于分布的高金属量尾部。我们还证实，海王星和超地球类行星可能更容易在较低的金属丰度找到。发现[Fe/H] $<$ 0在薄盘和厚盘恒星之间的丰度差异具有统计学意义。然而，厚盘和薄盘的种群不能清楚地分开。
英文摘要：
We present a uniform study of the chemical abundances of 12 elements (Si, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Na, Mg, and Al) derived from the spectra of 451 stars observed as part of one of the HARPS GTO planet search programs. Sixty eight of these are planet-bearing stars. The main goals of our work are: i) the investigation of possible differences between the abundances of stars with and without planets; ii) the study of the possible differences in the abundances of stars in the thin and the thick disc. We confirm that there is a systematically higher metallicity in planet host stars, when compared to non planet-hosts, common to all studied species. We also found that there is no difference in the galactic chemical evolution trends of the stars with and without planets. Stars that harbour planetary companions simply appear to be in the high metallicity tail of the distribution. We also confirm that Neptunian and super-Earth class planets may be easier to find at lower metallicities. A statistically significative abundance difference between stars of the thin and the thick disc was found for [Fe/H] $<$ 0. However, the populations from the thick and the thin disc cannot be clearly separated.
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