The newly discovered planets ( planets outside the solar system) belong to the sub-Neptune group, meaning planets with a radius smaller than Hai Vuong even though they may have a larger mass, or planets with a smaller mass than Hai Vuong even though they have a larger radius.
This satellite is called TOI-269 b, nearly three times larger than Earth.
The discovery was detailed by astronomers in an April article published in the arXiv.
NASA's TetESS is surveying about 200,000 brightest stars near the Sun to search for transitional planets.
To date, TESS has identified nearly 2,700 candidate planets, of which 125 have been confirmed.
TOI-269 (also known as TIC 220479565) is an M-sion star 186 light-years from Earth. Thisun star has an M2V spectrum, a radius of about 0.4 times the radius of the Sun and a mass of approximately 0.39 times the Sun. The star's effective temperature is estimated at around 3,500K, while its metal count is around -0.29.
TESS observed TOI-269 from September 2018 to July 2019 with the result being the determination of the star's path of forward signals in the curve of light. Now, through multiple lunar launched launched launched on the Earth, including ExTrA at the La Silla Observatory in Chile, a team of astronomers led by Marion Cointepas have confirmed the planetary nature of the signal.
The newly discovered satellite has a radius of about 2.77 banas of Earth, 8.8 times larger than Earth, and rotates around the home star 3.7 times a day. Observations show that TOI-269 b is about 0.0345 objects from the mother star and its balance temperature is likely to be at 530K.
Interestingly, the another planet TOI-269 b has an unusually high center of the orbit - approximately 0.425. This is one of the planets with the highest deviation of the known cycles of less than 10 days.
"We estimate that TOI-269 b may have a high center shift as it moves inward through interactions between planets and the planets," the astronomers said.
In addition, the density of the extra planets TOI-269 b, which is calculated at about 2.28g/cm3, is significantly lower than the typical density of rocky planets and shows the presence of an easy-to-evaporate coating.
Such a low density and other characteristics of the newly discovered planets make the planet an interesting target in the description of atmospheric characteristics to compare with other sub-Neptune stars.
