Planetologists discovered a rare exoplanet — a hot and supertight subneptoon

Planetologists discovered a rare exoplanet — a hot and supertight subneptoon

Scientists have discovered a new rare planet, TOI-2196 b. It's a hot gas ball, the size of Neptune, with unusual density, and a study has shown that although the mass of the planet may have been larger in the past, it originally formed as a subneptun.

NASA's TESS space telescope recorded a change in the glitter associated with the planet's transit while observing a class G star, TOI-2196. This star, located 861 light years away from the Earth, is similar in size, mass, temperature and age to the Sun.

Following the detection of signs of transit, researchers confirmed the planetary nature of the detected signal by measuring the ray velocity using a spectrograph installed at the European Space Observatory telescope in Chile.

Observations have shown that TOI-2196 b is about 3.5 times the size of the Earth and 26 times the mass of our planet. This gives a density of about 3.31 g/cm3. Although it is smaller than the Earth, it is very large for subneptuns. TOI-2196 b is smaller than Neptune, but 50 per cent larger, resulting in high volume density.

TOI-2196b has a relatively short period of circulation: "year" on this planet lasts only 1.2 Earth days. As a result, the planet's surface temperature must remain stable at around 1860 K. Researchers note that such conditions turn TOI-2196b into a rare type of hot sub-neptun.

At this close distance from the star, there are usually two types of planets that survive, either very small and rocky objects that are twice the size of Earth, or hot gas giants the size of Jupiter.

On the cover: an art illustration of the hot Neptune.