High-resolution spectroscopic visible data were obtained with the Ultraviolet and Visible Echelle Spectrograph on the Very Large Telescope. Our goal was to analyze the data in an effort to detect the presence of sodium in the atmosphere of hot Jupiter exoplanet KELT-10b, as well as characterize the orbit of the planet via the Rossiter-McLaughlin effect. Eighty spectra were collected during a single transit of KELT-10b. After standard spectroscopic calibration using ESO-Reflex, the synthetic telluric modeling software molecfit was applied to remove terrestrial atmospheric effects, and to refine the wavelength calibration. Sodium is recognized by its characteristic absorption doublet located at 5895.924 and 5889.951 Å, which can be seen in the planet atmosphere transmission spectrum and through excess absorption during the transit. The radial velocity of the host star was analyzed by measuring the average shift of absorption features from spectrum to spectrum. Our results indicate a sodium detection in the planet transmission spectrum with a line contrast of 0.66% and 0.43% 0.09% for the sodium DII and DI lines, respectively. Excess absorption measurements agree to within one half combined standard deviation between the planet transmission spectrum (0.143% 0.020%, a 7σ detection) and during the time series (0.124% 0.034%, a 3.6σ detection) in a band 1.25 Å wide. The wavelength grid corrections provided by molecfit were insufficient to determine radial velocities and measure the Rossiter-McLaughlin effect.

使用超大望远镜上的紫外和可见阶梯光谱仪获得高分辨率光谱可见数据。我们的目标是分析数据，以检测热木星系外行星 KELT-10b 大气中钠的存在，并通过 Rossiter-McLaughlin 效应表征行星的轨道。在一次 KELT-10b 过境期间收集了 80 个光谱。使用 ESO-Reflex 进行标准光谱校准后，合成大地建模软件molecfit被应用于消除地面大气效应，并改进波长校准。钠的特征吸收双峰位于 5895.924 和 5889.951 Å，这可以在行星大气透射光谱中以及通过在运输过程中的过度吸收中看到。通过测量吸收特征从光谱到光谱的平均位移来分析主星的径向速度。我们的结果表明在行星透射光谱中检测到钠，钠 DII 和 DI 线的线对比度分别为 0.66% 和 0.43% 0.09%。过量吸收测量值在行星透射光谱（0.143% 0.020%，7 σ检测）和时间序列期间（0.124% 0.034%，3.6σ检测）在 1.25 Å 宽的波段。由molecfit提供的波长网格校正不足以确定径向速度和测量Rossiter-McLaughlin 效应。