| Name: Rosemin John |
| Affiliation: National Institute of Science Education and Research |
| Conference ID: ASI2026_911 |
| Title: Modelling Reflected Light Spectra of Exoplanet Atmospheres |
| Abstract Type: Poster |
| Abstract Category: Sun, Solar System, Exoplanets, and Astrobiology |
| Author(s) and Co-Author(s) with Affiliation: Rosemin John(National Institute of science Education and Research, Jatni - 752050, India), Jayesh Goyal(National Institute of science Education and Research, Jatni - 752050, India) |
| Abstract: Over the past decade, exoplanet science has made great leap towards atmospheric characterization. While modelling approaches for transiting exoplanets are well developed through transmission and emission spectroscopy, reflected-light modelling remains limited. The James Webb Space Telescope(JWST) and upcoming missions such as the Roman Space Telescope and the Habitable Worlds Observatory highlight the need for reflected-light models to interpret planetary albedos, clouds, and atmospheric energy budgets relevant to habitability. Therefore, we present a generalized reflected-light spectra model for exoplanet atmospheres within the Suite of Adaptable plaNetary atmoSphere model And Retrieval (SANSAR) that computes planetary albedo spectra over a broad range of planetary and atmospheric conditions. The model consistently treats wavelength-dependent gaseous and cloud absorption, Rayleigh scattering by atmospheric gases, and cloud scattering described using Mie theory with different phase function formulations. Multiple radiative transfer techniques are implemented within this framework, enabling systematic assessment of how methodological choices influence predicted spectra. By comparing against existing reflected-light models, we identify consistencies and isolate systematic discrepancies arising from radiative transfer assumptions and scattering treatments. The reflected-light spectra model developed in this work can be applied to exoplanets, solar system planets and even the Earth, thus providing a robust tool to plan and interpret reflected light observations from these planetary bodies. In the near future, such a model could also be useful for interpreting Venus observations from ISRO's Shukrayaan mission. |
