Transmission spectroscopy analyses of jovian planets with hubble space telescope, transiting exoplanet survey satellite, and james webb space telescope data

Abstract

Analysis of the chemical compositions of exoplanetary atmospheres provides valuable information about the conditions and characteristics of those atmospheres, potentially aiding the quest for signs of extraterrestrial life. So far, more than 3,000 exoplanets have been identified through the transit method. The transmission spectroscopy technique, which studies exoplanetary atmospheres during their transits, is widely used to study the atmosphere of transiting exoplanets. In this work, we study the atmospheres of 30 transiting exoplanets that are Jovian planets. We use light curves of these exoplanets observed by space-based telescopes (HST, TESS, and JWST) to analyze their transit depths and their atmospheric properties using the TransitFit package, a Python exoplanetary fitting package based on nested sampling algorithms. Our physical parameters from TransitFit are compared with those in the previous literature. Finally, TauREx 3, a fully Bayesian spectral retrieval code, analyze the transit depth per wavelength and reveal atmospheric compositions of these exoplanetary atmospheres. The interesting result from our analysis is the detection of water in the atmospheres of WASP-43 b, WASP-76 b, WASP-103 b, and HAT-P-26 b, with abundances of 0.01%, 5%, 0.02%, and 5% water, respectively.