论文标题
岩石行星L 98-59 B的Hubble WFC3光谱：没有证据表明无云的原始气氛
Hubble WFC3 Spectroscopy of the Rocky Planet L 98-59 b: No Evidence for a Cloud-Free Primordial Atmosphere
论文作者
论文摘要
我们正在使用来自HST的存档数据，即传播系外行星l〜98-59〜b来对其潜在的炎热气氛放置约束。我们分析了五次过境访问中的数据，并使用iraclis提取最终的组合传输频谱。然后，我们使用反向大气检索代码taurex分析组合的传输频谱。在传输频谱中，接近1.40〜 $μm$ $ $ $ $ 1.55〜 $μm$的吸收特征较弱，可以通过丰富的HCN模型对其进行建模。但是，具有合理假设的任何平衡化学模型无法解释不切实际的HCN衍生的高丰度。因此，最有可能的情况是，L〜98-59〜B在WFC3/G141带通道中具有平坦的，无特征的传输频谱，这是由于较薄的气氛较薄，平均分子量较高，一种具有不透明的气溶胶层或没有气氛的气氛，并且对于L〜98-59 〜B的氛围不可能，它的氛围非常不可能。由于HST/WFC3 G141 G141 Grism观察的狭窄波长覆盖范围和低光谱分辨率，我们无法分开这些不同的情况。我们的模拟显示，与詹姆斯·韦伯太空望远镜（JWST）相比，未来更高的精度测量值可用于更好地表征L〜98-59〜b的行星气氛。
We are using archived data from HST of transiting exoplanet L~98-59~b to place constraints on its potentially hot atmosphere. We analyze the data from five transit visits and extract the final combined transmission spectrum using Iraclis. Then we use the inverse atmospheric retrieval code TauREx to analyze the combined transmission spectrum. There is a weak absorption feature near 1.40~$μm$ and 1.55~$μm$ in the transmission spectrum, which can be modeled by a cloudy atmosphere with abundant HCN. However, the unrealistically high abundance of HCN derived cannot be explained by any equilibrium chemical model with reasonable assumptions. Thus, the likeliest scenario is that L~98-59~b has a flat, featureless transmission spectrum in the WFC3/G141 bandpass due to a thin atmosphere with high mean molecular weight, an atmosphere with an opaque aerosol layer, or no atmosphere, and it is very unlikely for L~98-59~b to have a clear hydrogen-dominated primary atmosphere. Due to the narrow wavelength coverage and low spectral resolution of HST/WFC3 G141 grism observation, we cannot tell these different scenarios apart. Our simulation shows future higher precision measurements over wider wavelengths from the James Webb Space Telescope (JWST) can be used to better characterize the planetary atmosphere of L~98-59~b.
