The researchers observed the M-dwarf TOI-2257 and noticed that on the light curve of the star there was a transit
The planetary nature of this signal has been confirmed by subsequent observations using ground-based means.
After these observations, astronomers discovered TOI-2257b, a sub-Neptune that they began to study with the TESS telescope, and the observations confirmed that there was a planet at these coordinates.
The discovered sub-Neptune has a radius of about 2.19terrestrial, it is 5.71 times heavier than our planet and makes a complete revolution around the parent star in 35.19 days. Astronomers have estimated the equilibrium temperature at 256 K.
The authors drew attention to the fact that sub-Neptune hasrelatively long orbital period - to date, only two other exoplanets with periods longer than TOI-2257b are known. Therefore, they concluded that it could even contain liquid water.
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