WASP-12 b's Extreme Orbit and Size Revealed in New TESS Study

A new study has refined key measurements of the exoplanet WASP-12 b using data from NASA's TESS mission. The findings confirm the planet's unusually large size and provide more precise details about its orbit and transit behaviour. These updates will help scientists better model the planet's atmosphere and long-term evolution.

WASP-12 b is an ultra-short period planet, completing an orbit around its star in just 1.0914036 days. Researchers analysed four transits captured by TESS, allowing them to measure the planet's mid-transit times with high accuracy. The updated ephemeris—now with a refined mid-transit time of 2458991.3491 BDT—improves predictions for future observations.

TESS photometry also enabled precise measurements of the planet's physical properties. The study confirmed the planet-to-star radius ratio, orbital inclination, impact parameter, and transit duration. These values align with earlier findings but now offer greater precision, reinforcing WASP-12 b's reputation as one of the most inflated exoplanets known.

The refined data will support further atmospheric modelling and investigations into the planet's dynamical structure. Accurate transit timings are essential for understanding the physical processes shaping this extreme world.

The updated parameters for WASP-12 b provide a stronger foundation for future research. Scientists can now predict transit events more reliably, aiding studies of its atmosphere and orbital evolution. The findings highlight the value of TESS in refining our knowledge of well-studied exoplanet systems.