A Dusty Component to the Gaseous Debris Disk around the White Dwarf SDSS J1228+1040

Abstract

We present ISAAC spectroscopy and ISAAC, UKIDSS and Spitzer Space Telescope broad-band photometry of SDSS J1228+1040 -- a white dwarf for which evidence of a gaseous metal-rich circumstellar disk has previously been found from optical emission lines. The data show a clear excess in the near- and mid-infrared, providing compelling evidence for the presence of dust in addition to the previously identified gaseous debris disk around the star. The infrared excess can be modelled in terms of an optically thick but geometrically thin disk. We find that the inner disk temperatures must be relatively high (~1700 K) in order to fit the SED in the near-infrared. These data provide the first evidence for the co-existence of both gas and dust in a disk around a white dwarf, and show that their presence is possible even around moderately hot (~22,000 K) stars.

16 pages, inc. 6 pages of tables and figures. Accepted for publication in ApJ

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• Dusty Disks Around Central Stars of Planetary Nebulae
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• The Geometry of the G29-38 White Dwarf Dust Disk from Radiative Transfer Modeling
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• Modeling the Evolution of Silicate/Volatile Accretion Discs around White Dwarfs
• An Upper Bound to the Space Density of Interstellar Comets
• Disk evaporation in a planetary nebula
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• A photospheric metal line profile analysis of hot DA white dwarfs with circumstellar material
• Detecting water ice and vapor disks originating from icy planetary bodies around white dwarfs with future PRIMA observations