X-ray Investigation of Origin of Dust Disks around Hot White Dwarfs

Details X-ray Investigation of Origin of Dust Disks around Hot White Dwarfs X-ray Investigation of Origin of Dust Disks around Hot White Dwarfs

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop..139c&link_type=abstract

XMM-Newton Proposal ID #06733502

Physics

Stars, White Dwarfs, Solar System, Wd 0439+466

Scientific paper

The Helix Nebula's central white dwarf (WD) exhibits hard X-rays and strong mid-IR emission not expected from its photosphere. Analyses of Spitzer photometric and spectral observations suggest the presence of a dust disk at r=50-100 AU. Accretion of this circumstellar dust onto the WD's surface may power the hard X-ray emission. We have found additional 9 WDs with 24 um excesses which may also originate from dust disks. We request EPIC observations of the 4 closest hot WD with mid-IR excesses to help determine whether there is a causal connection between the mid-IR excess and hard X-ray emission. The X-ray luminosities, spectra, and temporal variations will be used to evaluate whether accretion powers the hard X-ray emission.

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