🔄FROM THE ARCHIVE: The recently-discovered gas giant is the second hottest planet on record. It's also slowly spiraling into its own host star.
roughly 800 light years from Earth swings around its star so quickly that a year passes in 16 hours. The trouble is nobody would last long enough to get old even on TOI-2109b’s own terms — the Jupiter-like gas giant is blazing hot.
Gas giants in general are pretty rare, but for scientists to have detected something so hot, so large and so close to its star is even rarer.The Transiting Exoplanet Survey Satellite is a telescope orbiting Earth that researchers use to discover distant solar systems. TESS was observing a star roughly 800 light years from Earth in the northern sky during the summer of 2020 when it detected a transit signal that occurred roughly every 16 hours.
The researchers found the gas giant is even larger than Jupiter — about 35 percent larger, they reported in a. In addition to its sheer size, TOI-2109b is also about five times the mass of Jupiter.Beyond determining its size and mass, the scientists also studied how hot it gets on the gas giant. The researchers calculated the daytime temperature of the newly-discovered planet to be almost 4,000 degrees Celsius. This puts TOI-2109b as the second hottest planet we’ve yet discovered.
The radius of the host star is also 70 percent larger than ours. “It’s a hotter and larger host star than the sun,” Wong says. “Both objects are scaled up relative to the sun and Jupiter.”In fact, TOI-2109b is so close that it’s liable to get even closer in a relatively short period of time. The proximity and the strong gravitational interaction is slowing the gas giant’s overall momentum.
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