2-MASS sources with 12um excesses

Details 2-MASS sources with 12um excesses 2-MASS sources with 12um excesses

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop..135w&link_type=abstract

Spitzer Proposal ID #135

Physics

Scientific paper

We will observe 14 main-sequence stars with 12 micron excesses, indicating the presence of warm (temperature of order 300 K) circumstellar dust debris disks. We discovered these systems using 2MASS J, H, Ks photometry, to estimate photospheric SEDs, and IRAS FSC or SSC 12 micron photometry. The dust is located at about 1--10 AU from the stars, in possible asteroidal clouds. We will obtain IRAC 3.6, 4.5, 5.8, and 8 micron very precise photometry (S/N > 100) to search for the hottest dust, and therefore the innermost edge, of the disks. Through IRS 5.3--21.8 micron spectroscopy (S/N > 20) we will search for PAH 6.2, 7.7, 8.6, and 11.3 micron features, and 10 and 20 micron silicate emission features. We will also search for colder dust, more distant from the stars, in Kuiper Belt-like regions, through MIPS 24 micron photometry (S/N > 20).

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