ABIOTIC OXYGEN-DOMINATED ATMOSPHERES ON TERRESTRIAL HABITABLE ZONE PLANETS

被引：169

作者：

Wordsworth, Robin ^{[1
]}

Pierrehumbert, Raymond ^{[1
]}

机构：

[1] Univ Chicago, Dept Geophys Sci, Chicago, IL 60622 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2014年 / 785卷 / 02期

基金：

美国国家科学基金会;

关键词：

astrobiology; planets and satellites: atmospheres; planets and satellites: physical evolution; planets and satellites: terrestrial planets; planet; star interactions; EARTH-LIKE PLANETS; RUNAWAY GREENHOUSE; SOLAR-ACTIVITY; SUPER-EARTHS; EVOLUTION; WATER; EXOPLANETS; LIFE; BIOSIGNATURES; SPECTROSCOPY;

D O I：

10.1088/2041-8205/785/2/L20

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Detection of life on other planets requires identification of biosignatures, i.e., observable planetary properties that robustly indicate the presence of a biosphere. One of the most widely accepted biosignatures for an Earth-like planet is an atmosphere where oxygen is a major constituent. Here we show that lifeless habitable zone terrestrial planets around any star type may develop oxygen-dominated atmospheres as a result of water photolysis, because the cold trap mechanism that protects H2O on Earth is ineffective when the atmospheric inventory of non-condensing gases ( e. g., N-2, Ar) is low. Hence the spectral features of O-2 and O-3 alone cannot be regarded as robust signs of extraterrestrial life.

引用

页数：4

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