Evidence for an Anhydrous Carbonaceous Extrasolar Minor Planet
  Using Keck/HIRES, we report abundances of 11 different elements heavier than helium in the spectrum of Ton 345, a white dwarf that has accreted one of its own minor planets. This particular extrasolar planetesimal which was at least 60% as massive as Vesta appears to have been carbon-rich and water-poor; we suggest it was compositionally similar to those Kuiper Belt Objects with relatively little ice. 
M. Jura, P. Dufour, S. Xu, B. Zuckerman, B. Klein, E. D. Young, C.   Melis
astro-ph.EP