Exogeology from Polluted White Dwarfs

被引：8

作者：

Xu, Siyi ^{[1
]}

Bonsor, Amy ^{[2
]}

机构：

[1] NSFs NOIRLab, Gemini Observ, 670 N Aohoku Pl, Hilo, HI 96720 USA

[2] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

来源：

ELEMENTS | 2021年 / 17卷 / 04期

基金：

美国国家科学基金会;

关键词：

chemical composition; extrasolar planetesimal; circumstellar material; white dwarfs; planet formation; differentiation; GIANT PLANET; DEBRIS;

D O I：

10.2138/gselements.17.4.241

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

It is difficult to study the interiors of terrestrial planets in the Solar System and the problem is magnified for distant exoplanets. However, sometimes nature is helpful. Some planetary bodies are torn to fragments and consumed by the strong gravity close to the descendants of Sun-like stars, white dwarfs. We can deduce the general composition of the planet when we observe the spectroscopic signature of the white dwarf. Most planetary fragments that fall into white dwarfs appear to be rocky with a variable fraction of associated ice and carbon. These white dwarf planetary systems provide a unique opportunity to study the geology of exoplanetary systems.

引用

页码：241 / 244

页数：4

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