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Tidal disruption and subsequent accretion of planetesimals by white dwarfscan reveal the elemental abundances of rocky bodies in exoplanetary systems.Those abundances provide information on the composition of the nebula fromwhich the systems formed, analogous to how meteorite abundances inform ourunderstanding of the early Solar System. We report the detection of Li, Na, Kand Ca in the atmosphere of the white dwarf Gaia DR2 4353607450860305024, whichwe ascribe to accretion of a planetesimal. Using model atmospheres, wedetermine abundance ratios of these elements, and with the exception of Li,they are consistent with meteoritic values in the Solar System. We compare themeasured Li abundance to measurements in old stars and to expectations from BigBang nucleosynthesis.

Lithium pollution of a white dwarf records the accretion of an extrasolar planetesimal