A Focused Search for Circumstellar Dust Orbiting White Dwarfs

Details A Focused Search for Circumstellar Dust Orbiting White Dwarfs A Focused Search for Circumstellar Dust Orbiting White Dwarfs

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50060j&link_type=abstract

Spitzer Proposal ID #50060

Physics

Scientific paper

Ten single metal-contaminated white dwarfs are known to possess an infrared excess; it is very likely that these stars are accreting tidally-disrupted asteroids. We propose to use 4.7 hours of telescope time with IRAC to search for an infrared excess around an additional 9 white dwarfs. Five hydrogen-rich targets are chosen because they are known to have unusually large metal accretion rates, and three helium-rich stars display a large amount of atmospheric calcium. One target is selected because it possesses substantially more atmospheric carbon than can be explained by conventional models. Is this star accreting from a tidally-disrupted carbon-rich minor planet?

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