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A Dusty Component to the Gaseous Debris Disk Around the White Dwarf SDSS J1228+1040
We present Infrared Spectrometer And Array Camera (ISAAC) spectroscopyand ISAAC, UKIDSS, and Spitzer Space Telescope broadband photometry ofSDSS J1228+1040—a white dwarf for which evidence of a gaseousmetal-rich circumstellar disk has previously been found from opticalemission lines. The data show a clear excess in the near- andmid-infrared (IR), providing compelling evidence for the presence ofdust in addition to the previously identified gaseous debris disk aroundthe star. The IR excess can be modeled in terms of an optically thickbut geometrically thin disk. We find that the inner disk temperaturesmust be relatively high (~1700 K) in order to fit the spectral energydistribution in the near-IR. These data provide the first evidence forthe coexistence of both gas and dust in a disk around a white dwarf, andshow that their presence is possible even around moderately hot (~22,000K) stars.
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