The observation of quadruple-peaked emission lines from WD J1328−1450 suggests that there are two separate, concentric rings of gas around the white dwarf. This finding could indicate the presence of two asteroid-sized to Pluto-sized planetary bodies that have survived disruption by the gravitational forces of the white dwarf.
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References
Zuckerman, B., Koester, D., Melis, C., Hansen, B. M. & Jura, M. The chemical composition of an extrasolar minor planet. Astrophys. J. 671, 872–877 (2007). This paper demonstrates how the composition of a planetesimal can be reconstructed from the spectroscopic signatures in the atmosphere of a white dwarf.
Manser, C. J. et al. Doppler imaging of the planetary debris disc at the white dwarf...