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Published May 10, 2009 | Published
Journal Article Open

A dusty component to the gaseous debris disk around the white dwarf SDSS J1228+1040

Abstract

We present Infrared Spectrometer And Array Camera (ISAAC) spectroscopy and ISAAC, UKIDSS, and Spitzer Space Telescope broadband 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 (IR), providing compelling evidence for the presence of dust in addition to the previously identified gaseous debris disk around the star. The IR excess can be modeled 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 spectral energy distribution in the near-IR. These data provide the first evidence for the coexistence 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.

Additional Information

© 2009 American Astronomical Society. Print publication: Issue 2 (2009 May 10); received 2008 July 23; accepted for publication 2009 February 18; published 2009 April 24. We thank the participants of the Winter AAS 2008 White Dwarf Splinter Session for their extremely helpful discussions and suggestions. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, Caltech, under NASA contracts 1407 and 960785. Thiswork makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and IPAC/Caltech, funded by NASA and the NSF. We acknowledge and thank the referee Jay Farihi for his detailed report.

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