Using NASA’s TESS satellite, an international team of astronomers has discovered a new brown dwarf. The results of the study are published by

Scientists recently discovered a brown dwarf, which they named TOI-2119b. It is the size of Jupiter, but more than 60 times more massive than the largest planet in the solar system.

Brown dwarfs are intermediate objects between planets and stars with masses from 13 to 80 Jupiters, also known as substars. Although many brown dwarfs have been discovered to date, it is rare that these objects orbit other stars. The new pair of star and substar is only the ninth such system.

A team of astronomers led by Theron W. Carmichael of the University of Edinburgh used the Transiting Exoplanet Survey Satellite (TESS) to observe the M-class active dwarf. It is half the size and mass of the Sun. This object, known as TOI-2119, is about 103.7 light-years from Earth. On the light curve of this star, scientists have found a transit signal. Subsequent studies confirmed that its source was a brown dwarf, which was named TOI-2119b.

The radius of TOI-2119b is almost the same as that of Jupiter (R1.08), and the mass is estimated at 64.4 gas giants. It orbits its star every 7.2 days at a distance of about 0.06 AU. from her. The brown dwarf’s orbit has an eccentricity of 0.337 and is tilted 88.4 degrees. The calculated effective temperature of this object was 2,030 Kelvin (1,757 °C).

The parent star TOI-2119 is about half the size and mass of our Sun. Its age is estimated at about 2.14 billion years, and the effective temperature is 3621 K (3348 °C). The astronomers added that this discovery makes TOI-2119 one of the most active M dwarfs, including a transiting brown dwarf.