论文标题
在WASP-33b的日间光谱中检测Fe \，{\ sc I}发射
Detection of Fe\,{\sc i} Emission in the Day-side Spectrum of WASP-33b
论文作者
论文摘要
我们分析了使用高分散光谱仪（R \，$ \ $ \，165,000）在8.2-m Subaru望远镜上分析WASP-33B的高分辨率发射光谱。数据覆盖$λ$ \，$ \ of $ \，$ 6170 $ - $ 8817 $ \，Å，划分超过30个频谱订单。在与行星光谱模板交叉相交之前，使用降趋势算法{\ sc sysrem}删除了牙槽和恒星线。我们计算模板，假设一个1-D平行的静水压气氛，包括无界H $^{ - } $的连续性不透明度和H $ _ {2} $的雷利散射，并具有一系列恒定丰度的Fe \，{\ sc I}。使用似然映射分析，我们检测到fe \，{\ sc i}的排放签名，位于6.4- $σ$，位于$ k _ {\ mathrm {p}} $ 226.0 \，$^，$^{+2.1} _ { $ v _ {\ mathrm {sys}} $ -3.2 \，$^{+2.1} _ { - 1.8} $ \，km \，km \，s $^{ - 1} $ - 与该星球在文献中的预期速度一致。我们还确认了行星日侧的热反转存在，这很可能是由于Fe \，{\ sc i}的存在以及在大气中先前检测到的TIO引起的。这使WASP-33B成为研究两种物种对超热木星能量预算的相对贡献的主要目标之一。
We analyze the high-resolution emission spectrum of WASP-33b taken using the High Dispersion Spectrograph (R\,$\approx$\,165,000) on the 8.2-m Subaru telescope. The data cover $λ$\,$\approx$\,$6170$-$8817$\,Å, divided over 30 spectral orders. The telluric and stellar lines are removed using a de-trending algorithm, {\sc SysRem}, before cross-correlating with planetary spectral templates. We calculate the templates assuming a 1-D plane-parallel hydrostatic atmosphere including continuum opacity of bound-free H$^{-}$ and Rayleigh scattering by H$_{2}$ with a range of constant abundances of Fe\,{\sc i}. Using a likelihood-mapping analysis, we detect an Fe\,{\sc i} emission signature at 6.4-$σ$ located at $K_{\mathrm{p}}$ of 226.0\,$^{+2.1}_{-2.3}$\,km\,s$^{-1}$and $v_{\mathrm{sys}}$ of -3.2\,$^{+2.1}_{-1.8}$\,km\,s$^{-1}$ -- consistent with the planet's expected velocity in the literature. We also confirm the existence of a thermal inversion in the day-side of the planet which is very likely to be caused by the presence of Fe\,{\sc i} and previously-detected TiO in the atmosphere. This makes WASP-33b one of the prime targets to study the relative contributions of both species to the energy budget of an ultra-hot Jupiter.
