2024/07/01 by Sayyed A. Rafi, Stevanus K. Nugroho, Rafi, Sayyed A. +7 · 1 citation
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #Astro and Planetary Science #Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences #Geological and Geochemical Analysis #Laser-induced spectroscopy and plasma
paper · pdf · doi:10.48550/arxiv.2407.01266
openalex publication_date 2024/07/01 · openalex created_date 2024/07/06 · openalex updated_date 2026/08/01
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 (R∼80,400). We found evidence of H2O at an S/N of ∼4.8. We also performed grid search using a Bayesian framework and constrained the orbital velocity Kp and rest velocity Vrest to 158.17+8.31-7.90 km s-1 and 2.57+0.54-0.57 km s-1, respectively. Whilst the retrieved Kp value is consistent with theoretical prediction, the retrieved Vrest value is highly red-shifted (>3-σ). 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 H2O 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.