Abstract Details

Name: Aritra Chakrabarty
Affiliation: Indian Institute of Astrophysics
Conference ID: ASI2020_238
Title : Transmission Spectra : Towards the Understanding of the Atmospheres of the Exoplanets
Authors and Co-Authors : Aritra Chakrabarty and Sujan Sengupta
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : We present new grids of transmission spectra for hot-Jupiters by solving the multiple scattering radiative transfer equations with non-zero scattering albedo instead of using the Beer-Bouguer-Lambert law for the change in the transmitted stellar intensity. To include the effect of diffused reflection and diffused transmission on the calculated transit depth we calculate the total transmitted flux by solving the radiative transfer equations including Rayleigh scattering albedo and Rayleigh phase function. We have constructed a code in Python that employs the discrete space theory of radiative transfer inherited from a decades-old well-known Fortran model. For a cloudless planetary atmosphere, Rayleigh scattering albedo alters the transmission depth up to about 0.6 μm. The effect of cloud or haze is calculated by incorporating the Mie theory of scattering which changes the transmission depth significantly throughout the optical and near-infrared regions. However, at wavelengths longer than about 1.2 μm, the scattering albedo becomes negligible. We have compared our model with some existing models and observational data for a few hot-Jupiters. Based on this fast Python-based forward model we will construct better and faster retrieval models in future which can be used to model the upcoming observational data from missions such as JWST, ARIEL etc.