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HD 76442


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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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观测天体数据

星座:船帆座
右阿森松:08h54m00.00s
赤纬:-52°37'07.0"
视星:8.206
距离:349.65 天文距离
右阿森松适当运动:-11.4
赤纬适当运动:10.1
B-T magnitude:8.089
V-T magnitude:8.197

目录:
适当名称   (Edit)
HD 1989HD 76442
TYCHO-2 2000TYC 8582-2393-1
USNO-A2.0USNO-A2 0300-05303223
HIPHIP 43699

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