C/O Ratio Studies in the atmosphere of hot Jupiters

Abstract Exoplanet atmospheres are a window into the chemical composition, internal motion and evolution of extrasolar planets. In the past two decades, more than 5,700 exoplanets have been discovered. The theoretical research and observation of exoplanet atmospheres have developed rapidly. Among the varieties of exoplanets, hot Jupiters are excellent objects for transit observation due to their characteristics of large radius, high temperature and close-in orbit, which provide many valuable research samples for spectroscopy. A large number of observations and studies have been carried out around it. With the rapid development of exoplanet atmospheres studies, this paper aims to provide a brief introduction on the detection methods of planetary atmospheres and the relevant research progress of the carbon-to-oxygen ratio (C/O) of hot Jupiters, which is an important property that reveals the atmospheric processes and planetary evolution, so as to show the prospect of the future study of exoplanet atmospheres.