Metallicity, debris discs and planets

Metallicity, debris discs and planets
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金属丰度、碎片盘和行星

DOI:
10.1111/j.1365-2966.2005.09848.x
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发表时间:
2006
影响因子:
4.8
通讯作者:
M. Wyatt
M. Wyatt
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
J. Greaves;D. Fischer;M. Wyatt

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我们调查人口的主序星在25 pc的碎片光盘和/或巨行星多普勒频移检测。碎片样本的金属丰度分布与一般恒星的金属丰度分布非常接近,但与巨行星样本的金属丰度分布有99%以上的置信度差异,后者有利于金属丰度高于平均值的恒星。这一结果不是由于两个样本的年龄差异造成的。因此,在几十个Au的碎片生成星子的形成似乎独立于原始盘的金属部分,在几个Au内的巨行星的生长和迁移历史。这些数据通常符合核心积累模型,即使是从固体含量较低的圆盘中最终形成外行星,而内行星需要快速的核心增长才能使气体仍然存在以形成大气。
We investigate the populations of main-sequence stars within 25 pc that have debris discs and/or giant planets detected by Doppler shift. The metallicity distribution of the debris sample is a very close match to that of stars in general, but differs with >99 per cent confidence from the giant planet sample, which favours stars of above average metallicity. This result is not due to differences in age of the two samples. The formation of debris-generating planetesimals at tens of au thus appears independent of the metal fraction of the primordial disc, in contrast to the growth and migration history of giant planets within a few au. The data generally fit a core accumulation model, with outer planetesimals forming eventually even from a disc low in solids, while inner planets require fast core growth for gas to still be present to make an atmosphere.
伦敦大学学院大盾空间科学实验室/爱丁堡大学(英国)
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