Brown dwarfs are objects between planets and stars. Astronomers divide them into 3 categories according to their temperature - L, T, Y. Their relatively low temperatures and brightness allow them to stay hidden for most part. Only the most powerful infrared telescopes are able to see them and that is where James Webb Space Telescope comes in.
Astronomers led by Teruyuki Hirano report discovery of a new exoplanet similar in size to Earth around nearby star K2-415. With only 16 % solar mass the small red dwarf is one of the smallest stars known to host exoplanets.
Astronomers found a brown dwarf in orbit of a bright B-type star HIP 33609. The host star has a radius 2.5 times bigger than the Sun and surface temperature above 10 000 °C. The newly found brown dwarf has about 7 % of the Sun's mass and about 16 % of its radius.
Binary star TOI 1338 has at least two exoplanets orbiting it. Astronomers led by Matthew Standing discovered the second one using radial velocity method and data from observatories La Silla and VLT. Exoplanet TOI 1338 c is the first one detected solely by the radial velocity method and the system TOI 1338 is now the second known to have multiple exoplanets orbiting more than one star.
New observations revealed that the two stars in the nearby system LP 413-53 are separated only by 0.01 AU (that is 1 % of distance between Earth and the Sun). This record-breaking distance means the stars orbit each other in mere 20.5 hours.
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16. 11. 2022 (SLS, Block 1)
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Brown dwarfs
