论文标题
在黄蜂的气氛中，光化学生产的$ _2 $
Photochemically-produced SO$_2$ in the atmosphere of WASP-39b
论文作者
论文摘要
光化学是行星气氛的基本过程，可调节大气成分和稳定性。但是，迄今为止，在系外行星大气中尚未检测到明确的光化学产品。 JWST Transiting系外行星早期发行科学计划的最新观察结果发现，在WASP-39B大气中，来自So $ _2 $引起的光谱吸收功能为4.05 $ $ m。 WASP-39b是1.27-Jupiter-radii，土星质量（0.28 m $ _j $）气体巨型巨型外部外界外行星，绕着像$ \ sim $ \ sim $ 1100 k的阳光般的恒星旋转。$ 1100 k。在这里，我们表明，由一套光化学模型计算出的So $ _2 $发行版可鲁棒地解释了4.05 $μ$ M的光谱特征，由JWST传输观测值带有NIRSPEC PRISM（2.7 $σ$）和G395H（4.5 $σ$）。因此，$ _2 $是通过硫化氢（H $ _2 $ s）被破坏时将硫基自由基的连续氧化产生的。 So $ _2 $的敏感性对通过重元素（金属性）富集大气的敏感性表明它可以用作大气特性的示踪剂，WASP-39B表现出推断的金属性$ \ sim $ 10 $ \ \ \ \ $ 10 $ \ times $ solar。我们进一步指出，因此$ _2 $还显示了现有观测值无法获得的紫外线和热红外波长的可观察功能。
Photochemistry is a fundamental process of planetary atmospheres that regulates the atmospheric composition and stability. However, no unambiguous photochemical products have been detected in exoplanet atmospheres to date. Recent observations from the JWST Transiting Exoplanet Early Release Science Program found a spectral absorption feature at 4.05 $μ$m arising from SO$_2$ in the atmosphere of WASP-39b. WASP-39b is a 1.27-Jupiter-radii, Saturn-mass (0.28 M$_J$) gas giant exoplanet orbiting a Sun-like star with an equilibrium temperature of $\sim$1100 K. The most plausible way of generating SO$_2$ in such an atmosphere is through photochemical processes. Here we show that the SO$_2$ distribution computed by a suite of photochemical models robustly explains the 4.05 $μ$m spectral feature identified by JWST transmission observations with NIRSpec PRISM (2.7$σ$) and G395H (4.5$σ$). SO$_2$ is produced by successive oxidation of sulphur radicals freed when hydrogen sulphide (H$_2$S) is destroyed. The sensitivity of the SO$_2$ feature to the enrichment of the atmosphere by heavy elements (metallicity) suggests that it can be used as a tracer of atmospheric properties, with WASP-39b exhibiting an inferred metallicity of $\sim$10$\times$ solar. We further point out that SO$_2$ also shows observable features at ultraviolet and thermal infrared wavelengths not available from the existing observations.
