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We present the discovery of what appears to be both a uniquely cool and oldwhite dwarf within 30 parsecs of the sun. DES J214756.46-403529.3 is detectedin four separate surveys, 50 degrees away from the Galactic Plane. Thecombination of its very low luminosity and spectral energy distributionsuggests an object unlike any other astrophysical body currently known. Among8,000 of the nearest single objects in the immediate solar neighbourhood, itappears completely isolated in multiple colour-magnitude diagrams. The dataseem compatible with an extremely old and cool white dwarf with a heliumdominated atmosphere and a mass around 0.7-0.8\,\msun\ but spectroscopicfollow-up is required to confirm its nature.

Discovery of a uniquely cool and compact source at 28 parsecs from the Sun