论文标题
h $ _2 $ - 域名的气氛，作为第二代岩石白矮人系外行星的指标
H$_2$-dominated Atmosphere as an Indicator of Second-generation Rocky White Dwarf Exoplanets
论文作者
论文摘要
在发现了第一个经过白色矮人（WD）的系外行星候选人之后，出现了一个“白矮人的机会”，以表征WDS周围的陆地系外行星的气氛。大行星与星形大小比率，因此很大的过境深度使得传播光谱传播的有利目标 - 在类似地球的行星上的光谱特征的结论性检测可以在中型的James Webb Space望远镜（JWST）计划中实现。但是，尽管机会显然有希望的机会，但第一代WD系外行星的后序列序列（MS）进化史从未纳入大气建模中。此外，从未从光化学的角度研究WD碎片磁盘中形成的第二代行星。我们证明，传输光谱可以识别第二代岩石WD系外行星，其厚度（$ \ sim1 $ bar）H $ _2 $ - 二世二世氛围。此外，我们可以通过研究CH $ _4 $堆积来推断WD系外行星的吹牛活动。
Following the discovery of the first exoplanet candidate transiting a white dwarf (WD), a "white dwarf opportunity" for characterizing the atmospheres of terrestrial exoplanets around WDs is emerging. Large planet-to-star size ratios and hence large transit depths make transiting WD exoplanets favorable targets for transmission spectroscopy - conclusive detection of spectral features on an Earth-like planet transiting a close-by WD can be achieved within a medium James Webb Space Telescope (JWST) program. Despite the apparently promising opportunity, however, the post-main sequence (MS) evolutionary history of a first-generation WD exoplanet has never been incorporated in atmospheric modeling. Furthermore, second-generation planets formed in WD debris disks have never been studied from a photochemical perspective. We demonstrate that transmission spectroscopy can identify a second-generation rocky WD exoplanet with a thick ($\sim1$ bar) H$_2$-dominated atmosphere. In addition, we can infer outgassing activities of a WD exoplanet based on its transmission spectra and test photochemical runaway by studying CH$_4$ buildup.
