8-12 juin, 2014


Autopsies of exo-Asteroids with KECK/HIRES

Patrick Dufour (Université de Montréal)

Debes, J. (STScI) +others (à ajouter)

We present preliminary results from our spectrocopic analysis of metal poluted white dwarfs recently observed with Keck/HIRES. The presence of heavy elementts at the photosphere of these stars is explained by the accretion from a compact circumstellar dust disk that is the result of the tidal disruption of an asteroid. Elemental abundances of asteroidal material in orbit around white dwarfs can thus be used as a proxy for probing the diverse chemistry of exo-planetary systems.
(doit être confirmé par le SOC)