Astronomers using NASA’s Transiting Exoplanet Survey Satellite (TESS) have discovered a massive gaseous exoplanet orbiting a subgiant star called HD 221416 (also known as TOI-197 and HIP 116158). Named HD 221416b, it is the first transiting exoplanet identified by TESS for which asteroseismology — a powerful observational technique used to determine stellar parameters and properties — of the host star is possible. An artist’s impression...
