A rocky exoplanet outside the Earth's solar system may have an atmosphere, according to new evidence gathered by NASA researchers.
The exoplanet, known as super-Earth TOI-561b, was discovered in 2020, according to NASA . Scientists have determined that the planet is ultra-hot, with a low density. It is about 1.4 times wider than Earth and orbits the sun in about 11 hours. Its host star is similar to Earth's sun in size and temperature, but the exoplanet is 40 times closer to that star than Mercury is to the sun, NASA said in a news release . Observations suggest the exoplanet has a global magma ocean and that it is surrounded by a thick layer of gas.
The exoplanet's low density has surprised and baffled scientists, NASA said. It may have an unusual composition from planets in Earth's solar system. It could also be surrounded by a thick atmosphere, which would not be expected on an exoplanet with these features. But the James Webb Space Telescope helped scientists gather data that showed that unlikely scenario might be the case.
Researchers used the telescope's Near-Infrared Spectrograph to measure the exoplanet's dayside temperature. If the exoplanet has no atmosphere, scientists estimated its dayside temperature would be about 4,900 degrees Fahrenheit. But the spectrograph found TOI-561b's temperature closer to 3,200 degrees Fahrenheit, far cooler than expected.
