Constraining the Carbon-to-Oxygen Ratio in Ross 458c
Anuranj Roy
Department of Physics & Astronomy
Faculty Supervisor: Elieen C. Gonzales
The Ross 458 system includes a pair of M dwarfs Ross 458AB, which are orbited by a 5-30 Jupiter mass companion Ross 458c between. This poses Ross 458 c as a possible planetary companion or brown dwarf. 3 Atmospheric Retrieval codes: POSEIDON, APPOLO, and Brewster, will be used in a comparative study to determine the best cloud model, chemistry precipitation, and formation pathway with the new JWST NIRSpec G140H R~2700 data, which covers the 0.81-3.13 microns wavelengths. However, due to how computational expensive retrievals are, the data will be binned to R=300 instead. This project will be focusing on the use of Brewster for a Cloudfree model, and 6 different power-law slab cloud species: KCl; MnS; Zns; Na2S; and MgSiO3. Brewster is also undergoing further developments in a project called Brewster v2. The development of v2 aims to reduce the use of FORTRAN and any redundant code whilst creating support for GPU’s and multi-layered cloud species for variability, increasing the functionality and decreasing the computational workload. This project will showcase the developments for the implementation of unit tests and any redundancies in our Python framework.