WD 0806−661
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WD 0806−661 (L 97-3, GJ 3483), formally named Maru,[1] is a DQ white dwarf with an extremely cold Y-type substellar companion (designated "B"), located in the constellation Volans at Template:Convert from Earth. The companion was discovered in 2011, and is the only known Y-type companion to a star or stellar remnant. At the time of its discovery WD 0806-661 B had the largest actual (2500 AU) and apparent separation (more than 2 arcminutes) of any known planetary-mass object, as well as being the coldest directly imaged substellar object then known.
WD 0806-661 B
Component WD 0806-661 B was discovered in 2011 with the Spitzer Space Telescope. Its discovery was announced in the paper Luhman et al., 2011. The secondary has a mass between 7 and 9 Template:Jupiter mass and a temperature between Template:Convert.[2] At the time of its discovery, WD 0806−661 B was the coldest "brown dwarf" that has ever been found.[3] The object is too faint to acquire a spectrum even with the Hubble Space Telescope, however the spectral type of this object was estimated to be Y1 based on its detection in Hubble images at near-infrared wavelengths.[4] The photometric colors of this object suggest that it is metal-poor. The metal-poor composition of the companion could explain the DQ spectral type of the primary white dwarf.[2] Hydrogen-deficient AGB stars might evolve into DB white dwarfs and then into DQ white dwarfs as they cool down.[5]
In August 2022, WD 0806-661 and its planetary-mass companion were included among 20 systems to be named by the third NameExoWorlds project.[6] The approved names, proposed by a team from South Korea, were announced in June 2023. WD 0806-661 and its companion are named after the Korean words Maru (Template:Wt) and Ahra (Template:Wt).[1]
See also
- List of exoplanets and planetary debris around white dwarfs
- WISE 0146+4234 – a Y0 companion to a T9 brown dwarf
- WISE 1217+1626 B – another Y0 companion to a T9 brown dwarf
- DT Virginis
- HD 106906 b
- GU Piscium b
Notes
References
External links
Template:Volans Template:2011 in space
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