Four Hidden White Dwarfs Discovered Close to Earth

A team of astronomers has directly observed four white dwarfs in binary systems within 65 light-years of Earth, using ultraviolet data from the Hubble Space Telescope. The findings, published in Monthly Notices of the Royal Astronomical Society, reveal these stellar remnants were hidden by the glare of their red dwarf companions.

The Discovery

The four systems were identified by a research team from the University of Warwick and the University of Colorado Boulder. The white dwarfs were detected in ultraviolet wavelengths, where they stand out despite the brightness of the red dwarfs. One system, G 203-47, located 25 light-years away, took 27 years to confirm and is now the ninth closest white dwarf known Source: ABC.es.

Key Details

• All four systems are within 65 light-years, and each contains a white dwarf orbiting a red dwarf.
• G 203-47's red dwarf rotates once every 100 days but orbits the white dwarf every 14.9 days—an unusual mismatch that suggests a different evolutionary history Source: Infobae.

Implications

Lead author Mairi O'Brien noted, "Even in our own cosmic neighborhood, we can still find surprises if we look the right way" Source: ABC.es. Co-author David Wilson added that the slow rotation of G 203-47 hints that some binary systems formed through gentler interactions Source: Infobae. This discovery updates the local census of white dwarfs within 20 parsecs.