Contributed Talk - Splinter Exoplanets

Thursday, 16 September 2021, 15:15   (virtual Exo)

Refined ephemeris for three hot Jupiters using ground-bases and TESS observations

А. Mazidabadi Farahani, F. Davoudi, et al.
IOTA/Middle East

WASP-33 b, WASP-36 b, and WASP-46 b are three transiting planetary systems on which we studied. These systems’ light curves were derived from observations made by the Transiting Light Exoplanet Survey Satellite (TESS) and some ground-based telescopes. We used Exofast-v1 to model these light curves and calculate mid-transit times. Also, we plotted TTV diagrams for them using derived mid-transit times and those available within the literature. Our MCMC analysis of these timings enabled us to refine the linear ephemeris of the three systems. We noticed that the orbital period is increasing in the WASP-46 b system; probably, its star magnetic activity is a better model for this period variation than orbital decay. WASP-36 b’s TTV diagram shows no apparent quadratic trend, and variations are likely due to incorrect linear ephemeris that has risen over the ten years.