Brinkworth, C. S. and Hoard, D. W. and Wachter, S. and Howell, S. B. and Ciardi, D. R. and Szkody, P. and Harrison, T. E. and van Belle, G. T. and Esin, A. A. (2007) Spitzer Space Telescope Observations of Circumbinary Dust Disks around Polars. In: 15th European workshop on white dwarfs. ASP Conference Series (372). Astronomical Society of the Pacific , San Francisco, pp. 333-336. ISBN 978-1-58381-239-6 http://resolver.caltech.edu/CaltechAUTHORS:20100820-082636250
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We present Spitzer Space Telescope IRAC photometry of the magnetic cataclysmic variables EF Eri, MR Ser, VV Pup, V834 Cen, GG Leo and V347 Pav. When we combine our results with the 2MASS data, we find that at least five of the polars have flux densities in the mid-IR in excess of the emission expected from the stellar components alone. We are unable to model this mid-IR excess with cyclotron emission, but we can recreate the observed spectral energy distributions with the inclusion of a simple circumbinary dust disk model. Importantly, we find that the masses of our modelled disks are approximately 12 orders of magnitude lower than required to significantly affect CV evolution. The accretion disk-less polars are ideal places to search for these disks, since the luminous accretion disk in most CVs would drown out the faint IR signature of the cooler, dimmer circumbinary disks.
|Item Type:||Book Section|
|Additional Information:||© 2007 Astronomical Society of the Pacific. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the Univ. of Mass. and IPAC/Caltech, funded by NASA and the National Science Foundation. We acknowledge with thanks the variable star observations from the AAVSO International Database, contributed by observers worldwide.|
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|Deposited By:||Tony Diaz|
|Deposited On:||20 Aug 2010 21:02|
|Last Modified:||26 Dec 2012 12:20|
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