TNG上的GAPS计划 LXXVIII. KELT-20b/MASCARA-2b大气中多种原子物种的相位分辨探测
The GAPS programme at TNG LXXVIII. Phase-resolved detection of multiple atomic species in the atmosphere of KELT-20b/MASCARA-2b
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中文总结 AI 辅助
本研究利用HARPS-N光谱仪分析KELT-20b/MASCARA-2b的七次凌星，通过互相关技术确认并新探测多种原子物种，并利用相位分辨分析揭示信号的双峰结构，表明大气吸收来自行星两个不同边缘。
中文摘要 AI 辅助
在系外行星的不同类别中，超热木星是大气特征刻画的重要实验室。KELT-20b/MASCARA-2b（HD 185603 b）的平衡温度约为2300 K，是一颗研究充分的超热木星，此前已通过透射光谱和发射光谱探测到多种原子物种。然而，关于化学元素清单的完整性以及可能模仿真实大气信号的虚假混叠信号的解释，仍存在重要的未解问题。此外，凌星过程中探测到的信号不对称性可以编码关于行星大气空间结构和动力学的宝贵信息。在本工作中，我们分析了使用国家伽利略望远镜上的高分辨率光谱仪HARPS-N观测到的KELT-20b/MASCARA-2b的七次凌星。我们将互相关函数技术应用于大量原子和离子物种，并考虑了可能导致假探测的混叠效应。我们确认了先前对HI、NaI、MgI、CrI、FeI和FeII的探测，并初步探测到CrII。我们进一步报告了在行星大气中 newly 探测到KI、CaI、VI、MnI和BaII，以及初步探测到PrI。通过进行相位分辨分析并将凌星分为凌星中前和凌星中后两个阶段，我们研究了探测信号的纵向变化。对于多个物种，我们在Kp-Vsys图中观察到双峰结构，特别是在CaI、VI、CrI和FeI中，这与来自行星两个不同大气边缘的吸收一致。
英文摘要
Among the different classes of exoplanets, ultra-hot Jupiters represent prime laboratories for atmospheric characterisation. With an equilibrium temperature of ~2300 K, KELT-20b/MASCARA-2b (HD 185603 b) is a well-studied ultra-hot Jupiter, for which several atomic species have already been detected in both transmission and emission spectroscopy. Nevertheless, important open questions remain regarding the completeness of the chemical inventory and the interpretation of spurious aliasing signals that may mimic genuine atmospheric signatures. In addition, asymmetries in the detected signals across transits can encode valuable information on the spatial structure and dynamics of the planetary atmosphere. In this work, we analyse seven transits of KELT-20b/MASCARA-2b observed with the high-resolution spectrograph HARPS-N at the Telescopio Nazionale Galileo. We apply the cross-correlation function technique to a large set of atomic and ionic species, accounting for aliasing effects that can lead to false detections. We confirm previous detections of HI, NaI, MgI, CrI, FeI, and FeII, and tentatively detect CrII. We further report new detections of KI, CaI, VI, MnI, and BaII, and a tentative detection of PrI in the planetary atmosphere. By performing a phase-resolved analysis and splitting the transit into pre- and post-mid-transit phases, we investigate longitudinal variations in the detected signals. For several species, we observe a double-peaked structure in the Kp-Vsys maps, notably in CaI, VI, CrI, and FeI, consistent with absorption arising from two distinct atmospheric limbs of the planet.
发表机构
- INAF – Osservatorio Astronomico di Brera（INAF - 布里拉天文台）
- Dipartimento di Scienza e Alta Tecnologia, Università degli Studi dell’Insubria（因苏布里亚大学科学与技术高等学院）
- Space Research Institute, Austrian Academy of Sciences（奥地利科学院空间研究所）
- INAF – Osservatorio Astronomico di Palermo（INAF - 巴勒莫天文台）
- INAF – Osservatorio Astrofisico di Torino（INAF - 都灵天文台）
- INAF – Osservatorio Astronomico di Padova（INAF - 帕多瓦天文台）
- Dipartimento di Fisica e Astronomia, Università degli Studi di Padova（帕多瓦大学物理与天文学系）
- INAF – Osservatorio Astrofisico di Catania（INAF - 卡塔尼亚天文台）
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