Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-02-24
Astrophys.J.696:1402-1406,2009
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
16 pages, inc. 6 pages of tables and figures. Accepted for publication in ApJ
Scientific paper
10.1088/0004-637X/696/2/1402
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.
Brinkworth Carolyn S.
Gaensicke Boris T.
Hoard Donald Wayne
Marsh Thomas R.
Tappert Claus
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