| Abstract : | Studying the physical and chemical characteristics of an exoplanet’s atmosphere is of utmost importance to understand the diversity of planetary atmospheres out there in the universe and it gives us insights into the process of formation, evolution and migration of planets. Transmission spectroscopy is one of the most successful techniques to study the atmosphere of an exoplanet. We have analyzed the transmission spectrum of two exoplanets. In this talk, I will discuss about our investigation of Hubble Space Telescope (HST) and James Webb Space Telescope (JWST) observations of two hot jupiters namely, WASP-39b and WASP-96b using a 1D planetary atmosphere radiative convective equilibrium model, ATMO for forward and retrieval studies. I will talk about the different physical and chemical characteristics that we have retrieved for the planets and the presence of different molecular species that we have detected in the atmosphere of these planets. For HST and SPITZER data of WASP-39b, we find three distinct absorption features of water vapour in this planet’s transmission
spectrum, as found by previous studies. We also find evidences of Na in the planet’s atmosphere, however, at very low abundance. Our retrieved model predicts the presence of CO and CO2 in the atmosphere of WASP-39b which is in accordance with the recently published study of JWST NIRspec PRISM data as a part of ERS.
Both of these exoplanets have been observed with JWST as initial targets under ERS (Early Release Science) program. |
