Ultra-short orbit exoplanet discovered

arXiv: Heaviest planet discovered in ultra-short orbit

Planet TOI-1347 b has a radius 1.8 times that of Earth and orbits its parent star every 0.85 days, or 20 hours and 20 minutes. It also has 11.1 times the mass of Earth and has a density of 9.9 grams per cubic centimeter. The equilibrium temperature, which does not take into account the effects of atmospheric gases and underground heat, is estimated to be 1400 Kelvin. The researchers believe that TOI-1437 b most likely has a Earth-like composition and is currently the most massive ultra-short-period planet with a radius less than twice that of Earth. I discovered that. Preliminary results suggest that the star also has a huge atmosphere, but this requires confirmation and further observations with the James Webb Space Telescope. Another planet was also discovered in this system – TOI-1437 c. It is slightly smaller than TOI-1437 b, with a radius approximately 1.6 times the radius of Earth. The upper limit of its mass is 6.4 times the mass of the Earth.

source: https://arxiv.org/abs/2402.07451