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Geology and Photometric Variation of Solar System Bodies with Minor Atmospheres: Implications for Solid Exoplanets

机译:具有小大气层的太阳系身体的地质和光度变化:对固体系外行星的影响

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摘要

A reasonable basis for future astronomical investigations of exoplanets lies in our best knowledge of the planets and satellites in the Solar System. Solar System bodies exhibit a wide variety of surface environments, even including potential habitable conditions beyond Earth, and it is essential to know how they can be characterized from outside the Solar System. In this study, we provide an overview of geological features of major Solar System solid bodies with minor atmospheres (i.e., the terrestrial Moon, Mercury, the Galilean moons, and Mars) that affect surface albedo at local to global scale, and we survey how they influence point-source photometry in the UV/visibleear IR (i.e., the reflection-dominant range). We simulate them based on recent mapping products and also compile observed light curves where available. We show a 5–50% peak-to-trough variation amplitude in one spin rotation associated with various geological processes including heterogeneous surface compositions due to igneous activities, interaction with surrounding energetic particles, and distribution of grained materials. Some indications of these processes are provided by the amplitude and wavelength dependence of variation in combinations of the time-averaged spectra. We also estimate the photometric precision needed to detect their spin rotation rates through periodogram analysis. Our survey illustrates realistic possibilities for inferring the detailed properties of solid exoplanets with future direct imaging observations. Key Words: Planetary environments—Planetary geology—Solar System—Extrasolar terrestrial planets. Astrobiology 14, 753–768.
机译:未来对系外行星进行天文学研究的合理基础在于我们对太阳系中行星和卫星的最佳了解。太阳系物体表现出各种各样的表面环境,甚至包括地球以外的潜在宜居条件,因此必须知道如何从太阳系外部进行表征。在这项研究中,我们概述了主要的太阳系固体的地质特征,这些固体具有较小的大气(即,陆地月亮,水星,伽利略卫星和火星),在局部到全球范围内影响地表反照率,并且我们调查了如何它们会影响UV /可见光/近IR(即反射主导范围)中的点光源测光。我们基于最新的贴图产品对它们进行仿真,并在可用时汇编观察到的光曲线。我们在一次自旋旋转中显示出5-50%的峰谷变化幅度,这与各种地质过程有关,包括由于火成活动,与周围高能粒子的相互作用以及粒状物质的分布而导致的表面成分不均一。这些过程的某些迹象是由时间平均光谱组合的变化的幅度和波长依赖性提供的。我们还估计了通过周期图分析来检测其旋转速度所需的光度精度。我们的调查表明,利用未来的直接成像观测来推断固体系外行星的详细属性的现实可能性。关键字:行星环境-行星地质-太阳系-太阳系外行星。天体生物学14,753–768。

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