Aggregate Cloud Particle Effects in Exoplanet Atmospheres

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Sanaz Vahidinia, Sarah E. Moran, Mark S. Marley, Jeffrey N. Cuzzi
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Abstract

Aerosol opacity has emerged as a critical factor controlling transmission and emission spectra. We provide a simple guideline for the effects of aerosol morphology on opacity and residence time in the atmosphere, as it pertains to transit observations, particularly those with flat spectra due to high altitude aerosols. This framework can be used for understanding complex cloud and haze particle properties before getting into detailed microphysical modeling. We consider high altitude aerosols to be composed of large fluffy particles that can have large residence times in the atmosphere and influence the deposition of stellar flux and/or the emergence of thermal emission in a different way than compact droplet particles, as generally modeled to date for extrasolar planetary atmospheres. We demonstrate the important influence of aggregate particle porosity and composition on the extent of the wavelength independent regime. We also consider how such fluffy particles reach such high altitudes and conclude that the most likely scenario is their local production at high altitudes via UV bombardment and subsequent blanketing of the atmosphere, rather than some mechanism of lofting or transport from the lower atmosphere.
系外行星大气中的聚合云粒子效应
气溶胶不透明度已成为控制透射和发射光谱的关键因素。我们为气溶胶形态对不透明度和在大气中的停留时间的影响提供了一个简单的指导,因为它涉及到过境观测,特别是那些由于高空气溶胶而导致光谱平坦的观测。在进行详细的微物理建模之前,这个框架可用于了解复杂的云雾粒子特性。我们认为高空气溶胶是由大的蓬松粒子组成的,它们在大气中的停留时间很长,对恒星流量的沉积和/或热辐射的出现的影响方式不同于紧凑的液滴粒子,这与迄今为止对太阳系外行星大气的一般建模方式不同。我们证明了聚合粒子的孔隙率和成分对波长无关机制范围的重要影响。我们还考虑了这种蓬松粒子如何到达如此高的高度,并得出结论:最有可能的情况是它们在高空通过紫外线轰击和随后的大气层覆盖而在本地产生,而不是从低层大气的某种悬浮或传输机制产生。
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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