主星和系外行星的组成：利用带有污染白矮星的宽双星进行的试验研究
Host-star and exoplanet compositions: a pilot study usinga wide binary with a polluted white dwarf
摘要：
行星和恒星最终形成于同一团气体的坍缩。虽然行星和行星体很容易释放挥发物，但一个常见的假设是它们保留了与其宿主恒星相同的耐火成分。这在太阳系中是真实的。在观测误差范围内，南极陨石、地球和其他岩石行星体的耐火成分与太阳一致。这项工作的目的是调查这一假设是否适用于系外行星系统。如果是真的，观测到的岩石系外行星的内部结构可以更好地利用它们的宿主恒星丰度来限制。在本文中，我们分析了K矮星G200-40的丰度，并将其与其污染的白矮星同伴WD 1425+540进行了比较。这颗白矮星从恒星演化到白矮星阶段时幸存下来的外行星系中吸积了行星物质，很可能是一个类似柯伊伯带的物体。由于双星对的化学性质是均匀的，我们使用双星伴星G200-40作为WD 1425+540的祖先的组成的代表。我们表明，伴星和行星物质吸积WD 1425+540的元素丰度是一致的假设，行星和主星有相同的真实丰度，考虑到观测误差。
英文摘要：
Planets and stars ultimately form out of the collapse of the same cloud of gas. Whilst planets, and planetary bodies, readily loose volatiles, a common hypothesis is that they retain the same refractory composition as their host star. This is true within the Solar System. The refractory composition of chondritic meteorites, Earth and other rocky planetary bodies are consistent with solar, within the observational errors. This work aims to investigate whether this hypothesis holds for exoplanetary systems. If true, the internal structure of observed rocky exoplanets can be better constrained using their host star abundances. In this paper, we analyse the abundances of the K-dwarf, G200-40, and compare them to its polluted white dwarf companion, WD 1425+540. The white dwarf has accreted planetary material, most probably a Kuiper belt-like object, from an outer planetary system surviving the star's evolution to the white dwarf phase. Given that binary pairs are chemically homogeneous, we use the binary companion, G200-40, as a proxy for the composition of the progenitor to WD 1425+540. We show that the elemental abundances of the companion star and the planetary material accreted by WD 1425+540 are consistent with the hypothesis that planet and host-stars have the same true abundances, taking into account the observational errors.
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