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2011MNRAS.413.2559F - Mon. Not. R. Astron. Soc., 413, 2559-2569 (2011/June-1)
The magnetic and metallic degenerate G77-50.
FARIHI J., DUFOUR P., NAPIWOTZKI R. and KOESTER D.
Abstract (from CDS):
The photospheric metals indicate accretion of rocky debris similar to that contained in asteroids, but the cooling age implies that a remnant planetary system should be stable. A possibility for G77-50 and similarly old, polluted white dwarfs is a recent stellar encounter that dynamically rejuvenated the system from the outside-in. Metal abundance measurements for these cooler white dwarfs have the potential to distinguish material originating in outer region planetesimals injected via fly-by. If common envelope evolution can generate magnetic fields in white dwarfs, then G77-50 and its classmates may have cannibalized an inner giant planet during prior evolution, with their metals originating in terrestrial bodies formed further out. Although speculative, this scenario can be ruled out if terrestrial planet formation is prohibited in systems where a giant planet has migrated to the inner region nominally engulfed during the post-main sequence.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): stars: abundances - circumstellar matter - stars: evolution - stars: magnetic field - planetary systems - white dwarfs
Simbad objects: 11
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