Abstract:About 25–50% of white dwarfs (WDs) show metal lines in their spectra. Among the widely accepted explanations for this effect is that these WDs are accreting asteroids that are perhaps flung onto the WDs by a planet via resonance, for instance. A number of theoretical works have looked into the accretion of asteroids onto WDs and obtained a fair agreement with the observed accretion rate. However, it is solely a very recent study (referenced in this work) that has taken asteroid binarity into consideration, exa… Show more
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