High Contrast Imaging of Dusty White Dwarfs
For the past 18 years, only one white dwarf with a circumstellar dust disk was known to exist. In the last two years, six new disks have been discovered. Since all material inwards of a few AU should be scoured clean during post main sequence evolution, the primary explanation is the presence of a planetary system that is perturbing relic planetesimals into the tidal disruption radius of the white dwarf. Dusty disks around white dwarfs should be markers for planets and we propose to use high contrast imaging to search for faint companions down to 6 M_$J$ that may be feeding the disks. White dwarfs are uniquely suited for planet searches, where the planet/white dwarf contrast is less than for main sequence stars.
We propose to observe 5 white dwarfs with the NICMOS coronagraph and 1 white dwarf with direct imaging over three orbits per target at different space craft orientations. We will be using the F110W filter. Where possible we have used the F160W filter for acquisition images; for our fainter targets we use the F110W filter. In addition to coronagraphy, we will be taking short images of SDSSJ122859.93+104033 in the F205W filter.
ISM AND CIRCUMSTELLAR MATTER
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