HAT-P-12 b的LBT透射光谱：确认无明显碱性特征的多云大气
LBT transmission spectroscopy of HAT-P-12b: confirmation of a cloudy atmosphere with no significant alkali features
摘要：
热的亚土星质量系外行星HAT-P-12 b是透射光谱学的理想目标，因为它的半径膨胀。我们用大双目望远镜（LBT）的多目标双摄谱仪（MODS）进行了一次凌日观测，获得了波长范围为0.4 - 0.9 $\sim$ m的大气透射谱。光谱相对平坦，没有显示出任何显著的钠或钾吸收特征。我们的结果是一致的修订哈勃太空望远镜（HST）的透射光谱的以前的工作，除了HST的结果表明，一个试探性的检测钾。钾的差异可能是HST数据集统计波动的结果。我们用一个广泛的云模型网格来拟合行星的透射光谱，并确认了行星大气中高海拔云的存在。对LBT和HST组合光谱进行拟合，其具有0.4 - 1.6 $\mathrmμ$ m的总波长范围。LBT/MODS光谱仪在透射光谱观测中具有独特的优势，因为它可以通过一次曝光覆盖宽的波长范围，并同时获得两组独立的光谱。
英文摘要：
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.
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