EVIDENCE FOR AN ANHYDROUS CARBONACEOUS EXTRASOLAR MINOR PLANET

M. Jura, P. Dufour, S. 偲艺 Xu 许, B. Zuckerman, B. Klein, E. D. Young, C. Melis
2015 Astrophysical Journal  
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.
doi:10.1088/0004-637x/799/1/109 fatcat:6uwnijxwdjgi3jsbnl4mlwxwie