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PEPSI系外行星凌星巡天。III：通过高分辨率发射光谱探测MASCARA-1 b大气中的FeI、CrI和TiI

The PEPSI Exoplanet Transit Survey. III: The detection of FeI, CrI and TiI in the atmosphere of MASCARA-1 b through high-resolution emission spectroscopy

G. Scandariato, F. Borsa, A. S. Bonomo, B. S. Gaudi, Th. Henning, I. Ilyin, M. C. Johnson, L. Malavolta, M. Mallonn, K. Molaverdikhani, V. Nascimbeni, J. Patien… 展开作者

G. Scandariato, F. Borsa, A. S. Bonomo, B. S. Gaudi, Th. Henning, I. Ilyin, M. C. Johnson, L. Malavolta, M. Mallonn, K. Molaverdikhani, V. Nascimbeni, J. Patience, L. Pino, K. Poppenhaeger, E. Schlawin, E. L. Shkolnik, D. Sicilia, A. Sozzetti, K. G. Strassmeier, C. Veillet, J. Wang, F. Yan

发表信息：
A&A 674, A58 (2023)
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AI总结：

本研究利用PEPSI高分辨率发射光谱在次食附近观测MASCARA-1 b，通过模板互相关探测到FeI、CrI和TiI，并解释了此前透射探测失败的原因。

摘要：

像MASCARA-1 b这样的热巨行星被认为具有热逆温大气，这使其成为通过高分辨率光谱进行大气表征的理想实验室。尽管如此，此前在透射光中探测MASCARA-1 b大气的尝试均得到了阴性结果。在本文中，我们旨在探测MASCARA-1 b的光学发射光谱。我们使用高分辨率光谱仪PEPSI在行星次食附近观测了MASCARA-1（光谱型A8）。我们将光谱与针对若干原子和分子种类计算的合成模板进行互相关。我们成功探测到MASCARA-1 b大气中的FeI、CrI和TiI，其S/N分别约为7、4和5，并证实了约13 km/s的预期系统速度以及MASCARA-1 b约200 km/s的径向速度半振幅。在近期提出的低于某一行星平衡温度时Ti会发生冷阱捕获的背景下，Ti的探测尤为重要。我们通过发射光谱证实MASCARA-1 b周围存在大气。我们得出结论，透射光谱中未能探测到大气，是由于该行星的高重力和/或行星轨迹与其多普勒阴影之间的重叠所致。

英文摘要：

Hot giant planets like MASCARA-1 b are expected to have thermally inverted atmospheres, that makes them perfect laboratory for the atmospheric characterization through high-resolution spectroscopy. Nonetheless, previous attempts of detecting the atmosphere of MASCARA-1 b in transmission have led to negative results. In this paper we aim at the detection of the optical emission spectrum of MASCARA-1 b. We used the high-resolution spectrograph PEPSI to observe MASCARA-1 (spectral type A8) near the secondary eclipse of the planet. We cross-correlated the spectra with synthetic templates computed for several atomic and molecular species. We obtained the detection of FeI, CrI and TiI in the atmosphere of MASCARA-1 b with a S/N ~7, 4 and 5 respectively, and confirmed the expected systemic velocity of ~13 km/s and the radial velocity semi-amplitude of MASCARA-1 b of ~200 km/s. The detection of Ti is of particular importance in the context of the recently proposed Ti cold-trapping below a certain planetary equilibrium temperature. We confirm the presence of an the atmosphere around MASCARA-1 b through emission spectroscopy. We conclude that the atmospheric non detection in transmission spectroscopy is due to the high gravity of the planet and/or to the overlap between the planetary track and its Doppler shadow.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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