Lithium burning occurs in brown dwarfs more massive than 52 Jupiters

20. 03 2023

Stars

Astronomers have discovered a brown dwarf orbiting the red giant HD 18438

Astronomers led by Byeong-Cheol Lee have made a groundbreaking discovery, detecting a brown dwarf orbiting the red giant HD 18438. With a radius of 89 times that of the Sun, HD 18438 is now the largest known star to be orbited by an exoplanet or brown dwarf.

08. 02 2023

Brown dwarfs

Astronomers used JWST and TESS telescopes to study nearby brown dwarf HD 19467 B

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.

03. 02 2023

Brown dwarfs

HIP 33609 is the hottest star known to host a transiting brown dwarf

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.

22. 01 2023

White dwarf

Discovery of a resolved white dwarf-brown dwarf binary with a small projected separation: SDSS J222551.65+001637.7AB