research
Wide Binary White Dwarfs Held Half as Much Planet Debris
DESI spectra found metal enrichment in 9.8% of cool white dwarfs in wide binaries, versus 20.5% of single controls.
Summary
DESI spectra found metal enrichment in 9.8% of cool white dwarfs in wide binaries, versus 20.5% of single controls.
Metals in a cool white-dwarf atmosphere are evidence of recently accreted planetary material. In DESI DR1, 9.8 ± 2.1% of cool white dwarfs in wide binaries were metal enriched, compared with 20.5 ± 0.9% of matched single systems, a reported 4.7-sigma difference. The authors also found tentative trends with projected separation and temperature. They interpret the deficit as either smaller starting reservoirs from suppressed planetesimal formation or faster depletion early in the white-dwarf stage; the data do not yet choose between those routes.
Why it matters
DESI spectra found metal enrichment in 9.8% of cool white dwarfs in wide binaries, versus 20.5% of single controls.
Limits and context
- They interpret the deficit as either smaller starting reservoirs from suppressed planetesimal formation or faster depletion early in the white-dwarf stage; the data do not yet choose between those routes.
Key claims
DESI spectra found metal enrichment in 9.8% of cool white dwarfs in wide binaries, versus 20.5% of single controls.
Qualification: They interpret the deficit as either smaller starting reservoirs from suppressed planetesimal formation or faster depletion early in the white-dwarf stage; the data do not yet choose between those routes.
Evidence: source-2026-09-12-015
Sources
- arXiv preprint 2609.11798arXiv · primary research
Corrections
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