论文标题
矿物灰尘增加了陆地行星的宜居性，但会混淆生物标志物检测
Mineral dust increases the habitability of terrestrial planets but confounds biomarker detection
论文作者
论文摘要
超越太阳系以外的可居住行星是当前和未来太空任务的关键目标。然而，宜居性不仅取决于恒星的辐照度，而且还取决于行星大气的组成部分。在这里，我们首次显示辐射活跃的矿物灰尘将对地球样系外行星的可居住性产生重大影响。在潮汐锁的行星上，灰尘会冷却白天，并温暖夜间，从而大大扩大了宜居区。与轨道构型无关，我们建议空气中的灰尘可以通过涉及减少海洋覆盖范围和增加灰尘载荷的反馈来推迟宜居区域内边缘的行星损失。灰尘的包含显着掩盖了模拟传播光谱中的关键生物标志物气（例如臭氧，甲烷），这意味着对观测的解释产生了重要影响。我们证明，陆生外行星的未来观察和理论研究必须考虑灰尘的影响。
Identification of habitable planets beyond our solar system is a key goal of current and future space missions. Yet habitability depends not only on the stellar irradiance, but equally on constituent parts of the planetary atmosphere. Here we show, for the first time, that radiatively active mineral dust will have a significant impact on the habitability of Earth-like exoplanets. On tidally-locked planets, dust cools the day-side and warms the night-side, significantly widening the habitable zone. Independent of orbital configuration, we suggest that airborne dust can postpone planetary water loss at the inner edge of the habitable zone, through a feedback involving decreasing ocean coverage and increased dust loading. The inclusion of dust significantly obscures key biomarker gases (e.g. ozone, methane) in simulated transmission spectra, implying an important influence on the interpretation of observations. We demonstrate that future observational and theoretical studies of terrestrial exoplanets must consider the effect of dust.
