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Evidence of Water Vapor in the Atmosphere of a Metal-Rich Hot Saturn with High-Resolution Transmission Spectroscopy
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Evidence of Water Vapor in the Atmosphere of a Metal-Rich Hot Saturn with High-Resolution Transmission Spectroscopy
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Paper
Evidence of Water Vapor in the Atmosphere of a Metal-Rich Hot Saturn with High-Resolution Transmission Spectroscopy
2024
Overview
Transmission spectroscopy presents one of the most successful approaches for investigating the atmospheres of exoplanets. We analyzed the near-infrared high-resolution transmission spectrum of a hot Saturn, HD 149026 b, taken using CARMENES spectrograph (\\(\\mathcal{R}\\sim80,400\\)). We found evidence of H\\(_2\\)O at an S/N of \\(\\sim\\)4.8. We also performed grid search using a Bayesian framework and constrained the orbital velocity \\(K_\\mathrm{p}\\) and rest velocity \\(V_{\\mathrm{rest}}\\) to \\(158.17^{+8.31}_{-7.90}\\) \\(\\mathrm{km\\ s}^{-1}\\) and \\(2.57^{+0.54}_{-0.57}\\) \\(\\mathrm{km\\ s}^{-1}\\), respectively. Whilst the retrieved \\(K_\\mathrm{p}\\) value is consistent with theoretical prediction, the retrieved \\(V_{\\mathrm{rest}}\\) value is highly red-shifted (\\(>\\)3-\\(\\sigma\\)). This might be an indication of either anomalous atmospheric dynamics at play or an orbit with non-zero eccentricity. Additionally, we searched for HCN but no successful detection has been made possibly due to the relatively low S/N dataset. The detection of H\\(_2\\)O and subsequent abundance retrieval, coupled with analysis of other species such as CO at the \\(K\\)-band, for example, might help us to get some information about the atmospheric C/O ratio and metallicity, which in turn could give us some insight into the planet formation scenario.
Publisher
Cornell University Library, arXiv.org
