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    Mini-Neptune exoplanet discovered

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    An international team of astronomers has announced the discovery of a new mini-Neptune exoplanet orbiting a star close to the Sun. The discovery is reported in an article published on the arXiv preprint server.

    TOI-2018 b was discovered by the transit method using the TESS spacecraft. The signal was identified in the light curve of the metal-poor red dwarf TOI-2018 (also known as BD+29 2654), which is 91.4 light-years from Earth. The planetary nature of this signal was confirmed by subsequent observations. TOI-2018 b has a radius of about 2.27 Earth radii and a mass of about 9.2 Earth masses, indicating a rocky core with a hydrogen-helium shell or a mixture of ice and rocks. The planet revolves around its star every 7.44 days, and its equilibrium temperature is estimated at 652 kelvins. Scientists have also discovered another object around TOI-2018 that could be an exoplanet. It is about 50 percent larger than the Earth, and its mass is estimated at no more than 3.6 Earth masses. Further studies are needed to confirm the planetary status of this object.

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