TOI-2285 b is an exoplanet orbiting the star TOI-2285, located 138.3 light-years (parsecs) from the Solar System, and was announced in 2021.
The star TOI-2285 has an apparent magnitude of 13.4 and an absolute magnitude of 10.3.
This star has 0.5 times the mass of the Sun, a radius of 0.5 times that of the Sun, a surface temperature of 3,491 K, and a spectral type of M4.
In this star’s planetary system, TOI-2285 b orbits the star TOI-2285 with an orbital period of 27.3 days and a semi-major axis of 0.14 astronomical units (20,390,189.8 km).
TOI-2285b was detected using the transit method by TESS. It was discovered by a team led by the University of Tokyo and the Center for Astrobiology at the National Institutes of Natural Sciences.
It is a super-Earth with an orbital period of 27.3 days, a radius 1.73 times that of Earth, and a mass 19.52 times that of Earth, orbiting its host star, TOI-2285, at a distance of approximately 0.14 astronomical units. Although it is slightly larger than Earth, it is on the smaller side among the exoplanets discovered to date.
The host star, TOI-2285, is a red dwarf with a surface temperature of approximately 3,500 K. Compared to the Sun, it is smaller, with a radius of 0.5 times and a mass of 0.5 times that of the Sun.
TOI-2285b is attracting attention due to the possibility that it may harbor a layer of liquid water. While water would quickly evaporate on a rocky planet with a thin atmosphere, Dr. Akihiko Fukui, an astronomer at the University of Tokyo, states, “Even if a rocky planet exists outside the habitable zone, it may retain liquid water under a hydrogen atmosphere.”
Since the host star is bright, detailed observations are possible, suggesting that further research will likely yield new insights.
We can expect to learn more about the planet’s interior and confirm the presence of water.
（文責:石原 一真）
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