Study finds some white dwarfs glow pink, yellow or purple, not just white

By the Everything Space news desk · 24 Oct 2026 · written from the sources below

Image: Universe Today

Atmospheric chemistry, not just temperature, can color these dense stellar remnants, challenging a basic assumption about blackbody radiators.

Researchers led by the University of Warwick have found that white dwarfs, the dense remnants left behind by dying stars, do not always glow white. By modeling the light from 151 white dwarfs within 65 light-years of Earth, the team identified five whose colors deviated sharply from the norm, appearing pink or yellow instead.

Stars are generally treated as near-perfect blackbody radiators, meaning their color depends almost entirely on surface temperature, progressing from red through orange, white and blue as objects heat up. But white dwarfs have unusually dense atmospheres, and the study examined whether elements trapped in those atmospheres could shift their apparent color away from the standard blackbody palette.

The analysis found that about 3.3 percent of the sampled white dwarfs showed colors influenced by specific elements rather than temperature alone. Carbon in a white dwarf's atmosphere was linked to pink or purple hues, while cooler white dwarfs rich in hydrogen and helium tended toward cyan or blue. White dwarfs carrying debris from their former planetary systems were found to often appear green.

Despite these oddities, the researchers emphasized that the typical white dwarf across a broader population still appears white when averaged out, meaning the unusual colors represent a minority rather than a shift in the overall picture.

The findings also raise the possibility that other star-like objects could diverge from standard blackbody colors. The study's lead author noted that brown dwarfs, which are too small to sustain hydrogen fusion, can also have dense atmospheres containing substances such as sodium, potassium and titanium oxide, which past research has suggested could give them a violet appearance.

The work suggests that atmospheric chemistry, not just temperature, needs to be factored into how astronomers interpret the colors and evolutionary histories of compact stellar remnants.

Written in Everything Space’s own words by our news-desk model from the sources above, and checked against them in code: every number in this report appears in its sources, and no sentence is copied from them.