Scientists have announced the discovery of two giant exoplanets. Preprint article about it published at arXiv.org.
Observations were made with the TESS orbiting telescope specially adapted to search for exoplanets. Their instruments are capable of detecting the slightest fluctuations in the brightness of stars as a planet passes through its disks.
Signs of planetary existence have been found in two red dwarfs, TOI-3984A and TOI-5293A, both of which are components of a binary system. The radius of planet TOI-3984A b is about 0.71 Jupiter radius and its mass is 0.14 Jupiter masses. It is classified as sub-Saturn since its orbital period is estimated at 4.35 days, orbital height of 0.041 astronomical units, and equilibrium temperature of 563 kelvins. The main star of this planet has half the mass of the Sun, its distance from the Earth is 353 sv. of the year.
The planet TOI-5293A b is as large as Jupiter but less massive and has a Jupiter mass of about 0.54. Its rotation period is 2.93 days and the altitude of the orbit is 0.034 astronomical units. This planet has been identified as a hot Jupiter, and therefore hotter than the first, with a surface temperature of 675 kelvin. The main star of this hot Jupiter is 524 sv. years, but also half the size of the Sun.
In summary, the authors of the paper emphasized that TOI-3984A b and TOI-5293A b are the two coldest known hot gas giants among Jupiter-sized exoplanets orbiting M-dwarfs.