Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40361h&link_type=abstract
Spitzer Proposal ID #40361
Physics
Scientific paper
In the first three years of operation, the Spitzer Space Telescope has discovered what are taken to be circumbinary dust disks surrounding interacting binaries of the cataclysmic variable and low-mass X-ray binary type. If true, there would be serious consequences for our current understanding of close binary evolution. However, recent detailed modeling of the observed mid-IR excess in these systems (e.g., Howell et al. 2006; Brinkworth et al. 2007) can not fully reproduce the mid-IR observations using only a dust disk. The systems observed to date have a commonality: the primary star in each (whether a white dwarf or a neutron star) is highly magnetic, having a field strength of 13MG or larger. One solution that can fit the observed IRAC fluxes is to invoke a continuum contribution from cyclotron radiation. Current models of cyclotron emission have yet to be tested at mid-IR wavelengths, and there are no predictions of what we should expect. We propose herein to search for the presence of mid-IR magnetically produced continuum radiation and thereby determine the cause of the observed mid-IR flux excesses. Additionally, we will provide the first test of the nature of cyclotron in the Spitzer wavelength regime.
Brinkworth Carolyn
Hoard Donald
Howell Steve
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