The frequency of metal-enrichment of cool helium-atmosphere white dwarfs using the DESI Early Data Release
arxiv(2024)
摘要
There is overwhelming evidence that white dwarfs host planetary systems;
revealed by the presence, disruption, and accretion of planetary bodies. A
lower limit on the frequency of white dwarfs that host planetary material has
been estimated to be roughly 25-50 per cent; inferred from the ongoing or
recent accretion of metals onto both hydrogen-atmosphere and warm
helium-atmosphere white dwarfs. Now with the unbiased sample of white dwarfs
observed by the Dark Energy Spectroscopic Instrument (DESI) survey in their
Early Data Release (EDR), we have determined the frequency of metal-enrichment
around cool-helium atmosphere white dwarfs as 21 ± 3 per cent using a
sample of 234 systems. This value is in good agreement with values determined
from previous studies. With the current samples we cannot distinguish whether
the frequency of planetary accretion varies with system age or host-star mass,
but the DESI data release 1 will contain roughly an order of magnitude more
white dwarfs than DESI EDR and will allow these parameters to be investigated.
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