Physics
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12169g&link_type=abstract
HST Proposal ID #12169. Cycle 18
Physics
Scientific paper
Throughout the past few years, it has become increasingly clear that the most plausible scenario to explain the metal-pollution observed in 20% of all cool white dwarfs is accretion from rocky debris material - suggesting that these white dwarfs may have had, or may still have terrestial planets as well. This hypothesis is corroborated through the infrared detection of circumstellar dust around the most heavily polluted white dwarfs. Traditionally, the detection of metal pollution is done in the optical using the Ca H/K lines, leading to a strong bias against hot/young white dwarfs. Hence, most of our knowledge about the late evolution of planetary systems is based on white dwarfs with cooling ages >0.5Gyr. We propose an HST/COS ultraviolet spectroscopic snapshot survey to carry out the first systematic investigation of the fraction of metal-pollution among young {20-100Myr} white dwarfs, probing the correlation with white dwarf {and hence progenitor} mass, and determining the Si/H, C/H, and potentially N/H and O/H abundance ratios of their circumstellar debris material.;
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