Born Again Disks as Signposts for Planets John H. Debes Space Telescope Science Institute

Slide from B. Gaensicke

Dusty White Dwarfs are Signposts for Planets In 1987, the ZZ Ceti G29-38 was discovered to have an infrared excess Excess first attributed to brown dwarf, eventually attributed to dust (i.e. Graham et al., 1991) Zuckerman & Becklin (1987)

Data from Reach et al. (2005) R in =10 R WD R out =30 R WD

Structure After Jura (2003), Jura et al., (2007), Reach et al., (2009) Dust Sublimation Tidal Disruption Radius

Slide from B. Gaensicke Gaseous WD Disks Are Signposts

Metal line White Dwarfs are Signposts for Planets G29-38 also showed absorption lines due to Ca, Mg, and Fe Large telescopes with high resolution spectrographs discovered that 25% of WDs have metal pollution (Zuckerman et al., 2003; Koester et al., 2005) Debes et al. (2010)

Composition Zuckerman et al. (2007)

COS can find exquisite abundances Gaensicke et al. (2011, in prep)

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Planetesimal Survival Dong et al., (2010)

Survival of Planetesimals Sublimation L max =2x10 4 L ʘ Gas Drag 3 M ʘ 1.5 M ʘ 1 M ʘ L max =10 4 L ʘ

How do you get asteroids in? Debes & Sigurdsson (2002) Unstable Planets

Bonsor et al., (2011) Exterior Resonances

Debes et al., in prep Interior Resonances

Accretion from Interior Resonances Gaensicke COS Survey Debes et al., in prep

Predict Belt Masses from Polluted WDs Debes et al., in prep

For more info, check out this new book!

Wide-field Infrared Survey Explorer WISE Mission Overview Salient Features 4 imaging channels covering microns wavelength4 imaging channels covering microns wavelength 40 cm telescope operating at <17K40 cm telescope operating at <17K Two stage solid hydrogen cryostatTwo stage solid hydrogen cryostat Delta launch from WTR on December 14, 2009Delta launch from WTR on December 14, 2009 Sun-synchronous 6am/6pm 500km orbitSun-synchronous 6am/6pm 500km orbit Scan mirror provides efficient mappingScan mirror provides efficient mapping Operational life: estimate 11 monthsOperational life: estimate 11 months 4 TDRSS tracks per day4 TDRSS tracks per day Salient Features 4 imaging channels covering microns wavelength4 imaging channels covering microns wavelength 40 cm telescope operating at <17K40 cm telescope operating at <17K Two stage solid hydrogen cryostatTwo stage solid hydrogen cryostat Delta launch from WTR on December 14, 2009Delta launch from WTR on December 14, 2009 Sun-synchronous 6am/6pm 500km orbitSun-synchronous 6am/6pm 500km orbit Scan mirror provides efficient mappingScan mirror provides efficient mapping Operational life: estimate 11 monthsOperational life: estimate 11 months 4 TDRSS tracks per day4 TDRSS tracks per day Science Sensitive all sky survey with 8X redundancySensitive all sky survey with 8X redundancy –Find the most luminous galaxies in the universe –Find the closest stars+brown dwarfs to the sun –Provide an important catalog for JWST –Provide lasting research legacyScience Sensitive all sky survey with 8X redundancySensitive all sky survey with 8X redundancy –Find the most luminous galaxies in the universe –Find the closest stars+brown dwarfs to the sun –Provide an important catalog for JWST –Provide lasting research legacy National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology

Dominic Benford - GSFC Andrew Blain - Caltech Martin Cohen - UCB Roc Cutri - IPAC Peter Eisenhardt -JPL Nick Gautier - JPL Tom Jarrett - IPAC Davy Kirkpatrick - IPAC David Leisawitz - GSFC Carol Lonsdale - NRAO Amy Mainzer - JPL John Mather - GSFC Ian McLean - UCLA Robert McMillan - UA Bryan Mendez - UCB Deborah Padgett - IPAC Michael Ressler - JPL Michael Skrutskie - UVa Adam Stanford - LLNL Russell Walker - MIRA PI: Edward L. Wright - UCLA National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology

The WIRED Team Stefanie Wachter, (IPAC, lead) Don W. Hoard (IPAC) Dave T. Leisawitz (GSFC) Martin Cohen (MIRA)

WISE Nominal Sensitivities Debes et al., ApJS, submitted

Known Disk

Circumbinary Dust

Known WDs

The Take Home Messages Dusty/Polluted/Gaseous Disk WDs need at least ONE giant planet to exist Mass and location of such planets may be constrained (and observed in the future with HST/JWST) IR+photospheric absorption lines give you detailed composition of exoasteroids

Take Home Messages-2 WIRED will provide a host of new candidates that need to be confirmed and characterized WIRED will provide variability info for known dusty white dwarfs WISE will provide legacy information as known WDs become complete to ~100pc (currently, only complete to ~20pc) Preliminary WISE catalogue is publicly available