Oxygen fugacities of extrasolar rocks: Evidence for an Earth-like geochemistry of exoplanets

被引：101
作者：
Doyle, Alexandra E. [1 ]
Young, Edward D. [1 ]
Klein, Beth [2 ]
Zuckerman, Ben [2 ]
Schlichting, Hilke E. [1 ,2 ,3 ]
机构：
[1] Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA USA
[3] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA
来源：
SCIENCE | 2019年 / 366卷 / 6463期
基金：
美国国家航空航天局;
关键词：
CORE FORMATION; SOLAR NEBULA; OXIDIZED IRON; WHITE-DWARFS; METAL-RICH; CONSTRAINTS; ACCRETION; MANTLE; DEBRIS; CARBON;
D O I：
10.1126/science.aax3901
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Oxygen fugacity is a measure of rock oxidation that influences planetary structure and evolution. Most rocky bodies in the Solar System formed at oxygen fugacities approximately five orders of magnitude higher than a hydrogen-rich gas of solar composition. It is unclear whether this oxidation of rocks in the Solar System is typical among other planetary systems. We exploit the elemental abundances observed in six white dwarfs polluted by the accretion of rocky bodies to determine the fraction of oxidized iron in those extrasolar rocky bodies and therefore their oxygen fugacities. The results are consistent with the oxygen fugacities of Earth, Mars, and typical asteroids in the Solar System, suggesting that at least some rocky exoplanets are geophysically and geochemically similar to Earth.
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页码：356 / +
页数：28
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