¹M. Jura, ²P. Dufour, ^1,3S. Xu, ¹B. Zuckerman, ¹B. Klein, ⁴E. D. Young, ⁵C. Melis
¹Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1562, USA
²Département de Physique, Université de Montréal, Montréal, Québec H3C 3J7, Canada
³European Southern Observatory (ESO), D-85748 Garching, Germany
⁴Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, Los Angeles, CA 90095, USA
⁵Center for Astrophysics and Space Sciences, University of California, San Diego, CA 92093-0424, USA

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.

Reference
Jura M, Dufour P, Xu S, Zuckerman B, Klein B, Young ED, Melis C (2015) Evidence for an Anhydrous Carbonaceous Extrasolar Minor Planet. The Astrophysical Journal  799 109
Link to Article [doi:10.1088/0004-637X/799/1/109]