论文标题
荷鲁斯传输光谱55 CNC E
HORuS transmission spectroscopy of 55 Cnc e
论文作者
论文摘要
高光学分辨率光谱仪（Horus）是10.4 m Gran Telescopio Canarias（GTC）上可用的新型高分辨率梯形光谱仪。我们报告了荷鲁斯对超级地球55 CNC e的过境的第一个观察结果。我们研究了Na I和H $α$在其传输光谱中的存在，并探讨了荷鲁斯在行星传输光谱方面的功能。我们的方法学导致了Na I Doublet线（3.4 $ \ pm $ 0.4）$ 10 $ \ times $ 10 $^{ - 4} $之间的差异频谱之间的残留物，这为从星球吸收大气中发现的一阶均具有更高的量表，这使得那些人数更高的范围更高的文献，从而确定了线路吸收率的上限。我们证明，我们能够使用荷鲁斯在残留光谱中达到光子噪声极限，以至于我们能够轻松地检测出具有较大气氛的巨型行星。此外，我们使用最先进的开源工具对55 CNC E的结构，化学和传输光谱进行了建模。
The High Optical Resolution Spectrograph (HORuS) is a new high-resolution echelle spectrograph available on the 10.4 m Gran Telescopio Canarias (GTC). We report on the first HORuS observations of a transit of the super-Earth planet 55 Cnc e. We investigate the presence of Na I and H$α$ in its transmission spectrum and explore the capabilities of HORuS for planetary transmission spectroscopy. Our methodology leads to residuals in the difference spectrum between the in-transit and out-of-transit spectra for the Na I doublet lines of (3.4 $\pm$ 0.4) $\times$ 10$^{-4}$, which sets an upper limit to the detection of line absorption from the planetary atmosphere that is one order of magnitude more stringent that those reported in the literature. We demonstrate that we are able to reach the photon-noise limit in the residual spectra using HORuS to a degree that we would be able to easily detect giant planets with larger atmospheres. In addition, we modelled the structure, chemistry and transmission spectrum of 55 Cnc e using state-of-the-art open source tools.
