A group of young researchers from Coundon Court School along with Orbyts Fellow Pratishtha Rawat and Benjamin Davies from the University of Warwick embarked on a mission to unravel the mysteries of KELT-25 b, a fascinating exoplanet orbiting its host star. Through analysis of light curve graphs from NASA's Transiting Exoplanet Survey Satellite (TESS) and the European Space Agency’s Characterising Exoplanet Satellite (CHEOPS), they've refined our understanding of this distant world.

The team's analysis, utilising five sets of TESS data, allowed for a precise determination of KELT-25 b's characteristics. They found the exoplanet completes an orbit every 4.4010443±0.0000016 days, with a mid-transit time centered at 2458493.32112±0.00060 BJD, and a radius of 1.751±0.018 Jupiter radii. Further, they meticulously analysed data from four CHEOPS visits, leveraging the TESS-derived parameters to pinpoint the exact mid-transit times.

A particularly exciting aspect of this research was the search for Transit Timing Variations (TTVs), which are subtle shifts in the planet's transit schedule that could betray the gravitational tug of another planet in the system. By refining the mid-transit times with the high-precision CHEOPS data, the team aimed to detect these minute shifts. However, despite their comprehensive analysis of both TESS and CHEOPS observations, the students found no evidence of TTVs.

This comprehensive research marks a significant step forward in our understanding of KELT-25 b. By updating the planet's parameters and confirming the absence of TTVs, these findings provide crucial information for future observations and a deeper comprehension of this exoplanetary system!