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An example for a star–brown dwarf binary is the first discovered T-dwarf Gliese 229 B, which orbits around the main-sequence star Gliese 229 A, a red dwarf. Brown dwarfs orbiting subgiants are also known, such as TOI-1994b which orbits its star every 4.03 days. [117]
Teide 1 is a brown dwarf located around 430 light years away in the Pleiades.It was the first brown dwarf to be confirmed. Its surface temperature is 2,600 ± 150 K, [6] which is about half that of the Sun.
At the time of its discovery, WD 0806-661 b was the coldest brown dwarf ever discovered, with a temperature of 325-350 Kelvin (52-77 °C or 125-170 °F) [2] and also had the largest separation from its star at about 2,500 AU at the time of its discovery. The photometric colors of the object suggest it is metal-poor. [3]
It is the fourth-closest star or (sub-) brown dwarf system to the Sun and was discovered by Kevin Luhman in 2013 using data from the Wide-field Infrared Survey Explorer (WISE). It is the coldest brown dwarf found in interstellar space, having a temperature of about 285 K (12 °C; 53 °F). [4]
Main-sequence stars vary in surface temperature from approximately 2,000 to 50,000 K, whereas more-evolved stars – in particular, newly-formed white dwarfs – can have surface temperatures above 100,000 K. [3] Physically, the classes indicate the temperature of the star's atmosphere and are normally listed from hottest to coldest.
This is a list of coolest stars and brown dwarfs discovered, arranged by decreasing temperature. The stars with temperatures lower than 2,000 K are included. Coolest main sequence stars
The smaller companion, CFBDSIR 1458+10B, has a surface temperature of approx 370 K (≈100 °C) [6] [7]. It used to be known as the coolest known brown dwarf until the discovery of WISE 1828+2650 in August 2011. [8]
This place it at the edge of the hydrogen burning limit – the dividing line between brown dwarfs and stars. Its effective temperature is of 1,340–1,410 K, consistent with an object between the spectral types L and T. The luminosity and temperature indicate that it is a brown dwarf rather than a low-mass star.