Confirming a second Helix-like cool debris disk

Details Confirming a second Helix-like cool debris disk Confirming a second Helix-like cool debris disk

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50530b&link_type=abstract

Spitzer Proposal ID #50530

Computer Science

Scientific paper

An IRAC observation of the central star of the old planetary nebula DeHt5 (WD2218+706) reveals excess emission at 8 microns, above that expected from the white dwarf alone. We can match this emission with a 100K blackbody, and it bares striking similarity to the so-far unique 100K excess emission observed for the central star of the Helix nebula (Su et al. 2007). MIPS photometry of the Helix has revealed the presence of a large, cool debris disk between 30-150AU from the central star, which may be the result of collisions in a Kuiper-belt during post-main sequence evolution. We will obtain MIPS photometry of WD2218+706 to confirm the excess emission, better constrain its temperature, mass and geometry, and compare it to the Helix. The confirmation of a second Helix-like disk around this older white dwarf would also enable us to begin investigation of the evolution of these debris disks with time.

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