To explore the range of possible atmospheres and assess whether transmission spectra can illuminate that difference, the astronomers created seven models for LP890-9c.
“This makes LP 890-9c a key to understanding how Venus and Earth evolved.” “However, LP 890-9c, receives 91% as much solar radiation as Earth, placing it within both the conservative and empirical habitable zone.” “LP 890-9c is part of a two-planet system with the inner planet, LP 890-9b, first detected by TESS in a 2.73-day orbit, inward of the habitable zone,” said Cornell University astronomer Lisa Kaltenegger and her colleagues. The outer planet, LP 890-9c, is similar in size to the first (about 37% larger than Earth) but has a longer orbital period of about 8.5 days. The inner planet, LP 890-9b, is about 30% larger than Earth and completes an orbit around the star in just 2.73 days. LP 890-9, which is orbited by at least two exoplanets, is the second-coolest star found to host planets after TRAPPIST-1. Otherwise known as TOI-4306 and SPECULOOS-2, the star has a mass of only 0.16 solar masses, a radius of 0.12 solar radii, and a temperature of 2,850 K (2,577 degrees Celsius, or 4,671 degrees Fahrenheit). LP 890-9 is located approximately 104 light-years away from Earth in the constellation of Eridanus. Image credit: Adeline Deward, RISE-Illustration. LP 890-9c, also known as SPECULOOS-2c, is providing important insights about conditions at the inner edge of a star’s habitable zone and why Earth and Venus developed so differently.
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