论文标题
在富含二氧化碳的系外行星大气中，硫驱动的雾化形成
Sulfur-driven Haze Formation in Warm CO2-rich Exoplanet Atmospheres
论文作者
论文摘要
硫气体显着影响我们太阳系中行星大气的光化学，预计将是系外行星大气中的重要组成部分。然而，由于在相关条件下缺乏硫种类的化学物质信息，因此在系外行星中硫硫化的光化学知之甚少。在这里，我们通过进行实验室模拟研究了硫化氢（H2S）在富含CO2的系外行星大气（800 K）中的光化学作用。我们发现，即使在相对较低的浓度（1.6％）中，H2S在光化学中也起着重要作用。它参与气相化学和固相化学，导致其他硫气体产物（CH3SH/SO，C2H4S/OCS，SO2/S2和CS2）的形成，并增加了固体雾剂颗粒的产生和组成复杂性。我们的研究表明，对于具有H2S的富含二氧化碳的外球星大气，我们可能会期望具有小颗粒尺寸（20至140 nm）的较厚的薄雾（20至140 nm）。
Sulfur gases significantly affect the photochemistry of planetary atmospheres in our Solar System, and are expected to be important components in exoplanet atmospheres. However, sulfur photochemistry in the context of exoplanets is poorly understood due to a lack of chemical-kinetics information for sulfur species under relevant conditions. Here, we study the photochemical role of hydrogen sulfide (H2S) in warm CO2-rich exoplanet atmospheres (800 K) by carrying out laboratory simulations. We find that H2S plays a significant role in photochemistry, even when present in the atmosphere at relatively low concentrations (1.6%). It participates in both gas and solid phase chemistry, leading to the formation of other sulfur gas products (CH3SH/SO, C2H4S/OCS, SO2/S2, and CS2) and to an increase in solid haze particle production and compositional complexity. Our study shows that we may expect thicker haze with small particle sizes (20 to 140 nm) for warm CO2-rich exoplanet atmospheres that possess H2S.
