WASP-12 b Archives

Figure adapted from M. MacLeod et al. (2025) and compiled using PWMorphology. Colored circles represent confirmed exoplanets with radii greater than 1.6R⊕ from the sunset catalog shown as a function of gravitational potential and the ratio of the Hill to planet radius. Survey targets as well as HAT-P-32 b, HAT-P-67 b, KELT-9 b, WASP-33 b, WASP-94 A b, and WASP-121 b are indicated with circles outlined in black and labeled appropriately. The different colors represent the predicted hill sphere Rossby number ln(o,H), where ln(Ro,H) > 0 indicates a bubble-like outflow geometry and ln(o,H) < 0 indicates a stream or tail-like outflow geometry. We note that values of ln(Ro,H) for HAT-P-32 b, HAT-P-67 b, KELT-9 b, WASP-33 b, WASP-94 A b, and WASP-121 b are calculated using the sunset photoevaporative outflow models for these planets. The dashed grey line indicates photoevaporative outflows with sound speeds of 10 km s−1 and Ro,H = 1. -- astro-ph.EP

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Gaia - Planetary Perspectives, Imaging & Spectroscopy, Status Report

The First Dedicated Survey of Atmospheric Escape from Planets Orbiting F Stars

by Keith CowingOctober 15, 2025October 15, 2025

Hydrodynamic escape can strip the envelopes of close-in exoplanets, but most observations of atmospheric mass loss to date have been confined to planets orbiting K and M dwarfs.

Modeled EW of the He i λ10833 Å signal as a function of temperature and mass-loss rate at the terminator for the high irradiation scenario. The admissible region is indicated by connected blue circles. Similarly, admissible regions are indicated for the moderate irradiation scenario (white, F/100) and the substellar-point model in Roche-lobe overflow (RLO, triangles). -- astro-ph.EP

Astronomy & Telescopes, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

The Elusive Atmosphere Of WASP-12 b / High-resolution Transmission Spectroscopy With CARMENES

by Keith CowingJanuary 6, 2024January 6, 2024

To date, the hot Jupiter WASP-12 b has been the only planet with confirmed orbital decay. The late F-type host star has been hypothesized to be surrounded by a large […]