An international team of astronomers has announced the discovery of two exoplanets whose mass is comparable to that of Saturn. The worlds designated TYC 2187-512-1 b and TZ Ari b revolve around red dwarfs close to the Sun.
The discovery was made using the radial velocity method as part of the CARMENES celestial view. The essence of the method is to find the characteristic “swaying” of the stars caused by the gravity of their invisible companions. It is the second most popular method of searching for exoplanets. To date, astronomers have discovered more than six hundred extra-solar worlds by measuring radial velocities.
TYC 2187-512-1 b is located at a distance of 50 light-years from Earth. The mass of the planet is estimated at a third of the mass of Jupiter. It moves in a wide orbit around its parent star, making one revolution in 692 days.
TZ Ari b is located at a distance of 14.5 light-years from Earth. The mass of the exoplanet is 0.21 Jupiter mass, it makes one revolution around its parent star in 771 days.
By the way, the mass of the star around which TZ Ari b orbits is only 15% of the solar one. At the moment, this is only the second time that a giant planet has been found near such a small star. According to the researchers, TZ Ari b was formed not as a result of accretion of material on the stone core, but during another mechanism called “disk instability”.
According to https://phys.org
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