Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3408f&link_type=abstract
American Astronomical Society, ESS meeting #2, #34.08
Astronomy and Astrophysics
Astronomy
Scientific paper
A large fraction of white dwarfs appear to be contaminated with metals despite their high surface gravities and short diffusion times. The current theoretical model for this contamination is accretion of rocky bodies, perturbed inwards toward the white dwarf by planets via instabilities caused by mass loss. We examine the stability of test particles in a single-planet system during the main sequence and white dwarf stages within 10 and 20 AU, respectively. In particular, we compare the instabilities that develop before and after the star loses mass to form a white dwarf, a process which causes the semi-major axes of the planet to expand adiabatically. We repeat this process for a range of planetary masses and eccentricities, focusing on the number of particles that become unstable and the fraction of those that impact the central body. These results are compared to the observed white dwarf accretion rates and duration of accretion.
Frewen Shane
Hansen Brad
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