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We present a new model atmosphere analysis of the most metal contaminatedwhite dwarf known, the DBZ SDSS J073842.56+183509.06. Using new high resolutionspectroscopic observations taken with Keck and Magellan, we determine preciseatmospheric parameters and measure abundances of 14 elements heavier thanhelium. We also report new Spitzer mid-infrared photometric data that are usedto better constrain the properties of the debris disk orbiting this star. Ourdetailed analysis, which combines data taken from 7 different observationalfacilities (GALEX, Gemini, Keck, Magellan, MMT, SDSS and Spitzer) clearlydemonstrate that J0738+1835 is accreting large amounts of rockyterrestrial-like material that has been tidally disrupted into a debris disk.We estimate that the body responsible for the photospheric metal contaminationwas at least as large Ceres, but was much drier, with less than 1% of the masscontained in the form of water ice, indicating that it formed interior to thesnow line around its parent star. We also find a correlation between theabundances (relative to Mg and bulk Earth) and the condensation temperature;refractory species are clearly depleted while the more volatile elements arepossibly enhanced. This could be the signature of a body that formed in a lowertemperature environment than where Earth formed. Alternatively, we could bewitnessing the remains of a differentiated body that lost a large part of itsouter layers.

Detailed compositional analysis of the heavily polluted DBZ white dwarf SDSS J073842.56+183509.06: A window on planet formation?