论文标题
访问：确认WASP-96B的清晰气氛和光曲线的比较降低技术
ACCESS: Confirmation of a Clear Atmosphere for WASP-96b and a Comparison of Light Curve Detrending Techniques
论文作者
论文摘要
WASP-96B中观察到了最强的$ {\ rm na〜i} $功能之一。为了确认这种新颖的检测，我们提供了一种新的475-825nm传输光谱，该传输光谱使用麦哲伦/iMac获得，这确实证实了存在广泛的钠吸收特征。当重新分析400-825nm VLT/fors2数据时，我们发现相同的结果。我们还利用合成数据来测试两种常见的脱发技术的有效性：（1）高斯过程（GP）例程，以及（2）共同模式校正，然后进行多项式校正（CMC+Poly）。我们发现，两种方法都不良重现了绝对的过境深度，但保持其真实的光谱形状。这强调了合并来自不同来源或时期的光谱时拟合偏移的重要性。此外，我们发现对于我们的数据集，两种方法都会给出一致的结果，但是CMC+Poly更准确和精确。我们将麦哲伦/iMac和VLT/fors2光谱与文献800-1644NM HST/WFC3光谱相结合，从400-1644nm中获得全球光谱。我们使用Platon和Exoretievals检索代码来解释这一频谱，并发现两者在$ 1.3^{+1.0} _ { - 1.1} $和0.29 $和0.29 $^{+1.86} _ { - 2.02} _ { - 2.02} $ BAR上，以$ 1.3^{+1.0} _ { - 1.1} _ {+1.0} _ {+1.0} _ {+1.0} _ {+1.0} _ {+1.0} _ {+1.0} _ {+1.0} _ {+1.0} _ { - 2.02} $ BAR，相应地相应地相应地，这两者都产生了相对更深的压力。 Exoretievals找到一个太阳能到超极$ {\ rm na〜i} $和$ {\ rm h_2o} $ log-mixing比率为$ -5.4^{+2.0} _ { - 1.9} $ { - 1.9} $和$ -4.5^{+2.0} _ {+2.0} _ { - 2.0} _ { - 2.0} $ ntresitial and glatic and and and and and and and glatic and an $ log_ {10}（z/z _ {\ odot}）= -0.49^{+1.0} _ { - 0.37} $ dex。因此，我们的发现与文献一致，并支持这样的推论：WASP-96B的终结器几乎没有气溶胶掩盖光学到近红外（近红外）光谱中的突出特征。
One of the strongest ${\rm Na~I}$ features was observed in WASP-96b. To confirm this novel detection, we provide a new 475-825nm transmission spectrum obtained with Magellan/IMACS, which indeed confirms the presence of a broad sodium absorption feature. We find the same result when reanalyzing the 400-825nm VLT/FORS2 data. We also utilize synthetic data to test the effectiveness of two common detrending techniques: (1) a Gaussian processes (GP) routine, and (2) common-mode correction followed by polynomial correction (CMC+Poly). We find that both methods poorly reproduce the absolute transit depths but maintain their true spectral shape. This emphasizes the importance of fitting for offsets when combining spectra from different sources or epochs. Additionally, we find that for our datasets both methods give consistent results, but CMC+Poly is more accurate and precise. We combine the Magellan/IMACS and VLT/FORS2 spectra with literature 800-1644nm HST/WFC3 spectra, yielding a global spectrum from 400-1644nm. We used the PLATON and Exoretrievals retrieval codes to interpret this spectrum, and find that both yield relatively deeper pressures where the atmosphere is optically thick at log-pressures between $1.3^{+1.0}_{-1.1}$ and 0.29$^{+1.86}_{-2.02}$ bars, respectively. Exoretrievals finds a solar to super-solar ${\rm Na~I}$ and ${\rm H_2O}$ log-mixing ratios of $-5.4^{+2.0}_{-1.9}$ and $-4.5^{+2.0}_{-2.0}$, respectively, while PLATON finds an overall metallicity of $log_{10}(Z/Z_{\odot}) = -0.49^{+1.0}_{-0.37}$dex. Therefore, our findings are in agreement with literature and support the inference that the terminator of WASP-96b has few aerosols obscuring prominent features in the optical to near-infrared (near-IR) spectrum.
