论文标题
HAT-P-12B的LBT传输光谱：确认没有明显碱特征的阴云
LBT transmission spectroscopy of HAT-P-12b: confirmation of a cloudy atmosphere with no significant alkali features
论文作者
论文摘要
由于半径膨胀，热的亚质量质量外球星量HAT-P-12B是传输光谱的理想目标。我们在大型双眼望远镜（LBT）上观察到该行星具有多对象双光谱仪（MOD）的一个传输，具有双眼模式，并获得了$ 0.4-0.4-0.9 $ \mathrmμ$ m $ 0.4-0.4-0.9 $ \ 0.9 $ \ sim $ \ sim $ \ sim $ \ sim $ 0.4-0.9 $ \mathrmμ$ m。光谱相对平坦，没有显示出任何明显的钠或钾吸收特征。我们的结果与先前工作的修订的哈勃太空望远镜（HST）传输光谱一致，只是HST结果表明对钾的暂定检测。钾差异可能是HST数据集统计波动的结果。我们使用广泛的云模型网格拟合行星传输光谱，并在行星大气中确认存在高空云。拟合是在合并的LBT和HST频谱上进行的，该光谱的总体波长范围为0.4-1.6 $ \MATHRMμ$ m。 LBT/MODS光谱仪在传输光谱观测中具有独特的优势，因为它可以通过一次曝光范围覆盖宽的波长范围，并同时获得两组独立的光谱。
The hot sub-Saturn-mass exoplanet HAT-P-12b is an ideal target for transmission spectroscopy because of its inflated radius. We observed one transit of the planet with the multi-object double spectrograph (MODS) on the Large Binocular Telescope (LBT) with the binocular mode and obtained an atmosphere transmission spectrum with a wavelength coverage of $\sim$ 0.4 -- 0.9 $\mathrmμ$m. The spectrum is relatively flat and does not show any significant sodium or potassium absorption features. Our result is consistent with the revised Hubble Space Telescope (HST) transmission spectrum of a previous work, except that the HST result indicates a tentative detection of potassium. The potassium discrepancy could be the result of statistical fluctuation of the HST dataset. We fit the planetary transmission spectrum with an extensive grid of cloudy models and confirm the presence of high-altitude clouds in the planetary atmosphere. The fit was performed on the combined LBT and HST spectrum, which has an overall wavelength range of 0.4 -- 1.6 $\mathrmμ$m. The LBT/MODS spectrograph has unique advantages in transmission spectroscopy observations because it can cover a wide wavelength range with a single exposure and acquire two sets of independent spectra simultaneously.
