Debris Disk Candidates in the MIPSGAL Survey

Details Debris Disk Candidates in the MIPSGAL Survey Debris Disk Candidates in the MIPSGAL Survey

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5015s&link_type=abstract

American Astronomical Society, AAS Meeting #211, #50.15; Bulletin of the American Astronomical Society, Vol. 39, p.813

Astronomy and Astrophysics

Astronomy

Scientific paper

Models predict debris disks (dust disks) around early type main sequence stars. As these disks are short lived they need continuous replenishment from destruction of comets and asteroids. Studies of such evolved disks are important in understanding planet formation. The properties of the dust particles in these disks preclude them from being detected in the near-IR, since the photospheric emission is much stronger in these wavelength ranges, but they can be detected in the mid-IR and longer wavelengths. Previous studies have shown that in the mid-IR one observes a small excess due to such disks. Such excess emission from the main-sequence stars can be used to detect debris disks. To date approximately 200 debris disk candidates have been discovered by their thermal emission.
We use the 24-micron "MIPSGAL" point source fluxes in combination with 2MASS and GLIMPSE data to look for debris disk candidates along the Galactic plane. MIPSGAL is a survey of the Galactic plane using the MIPS instrument onboard the Spitzer Space Telescope. This survey covers +/-1 degrees in latitude along the Galactic plane for 10 < l < 62, 298 > l > 350, plus a larger latitude map for the Galactic center longitudes (MIPSGAL II), excluding the Galactic center itself. We have reduced the data for the first quadrant of the Galactic plane and have a preliminary 24-micron point source catalog. We use 2MASS, IRAC and MIPS color-color criteria to detect debris disks around the point sources in the MIPSGAL catalog. We also investigate the SEDs of the selected debris disk candidates and estimate their excess at 24 microns. Comparison of these SEDs with those of known debris disks will provide further evidence of whether these MIPSGAL sources are in a similar evolutionary stage as the known debris disk sources.

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