Statistics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop...41r&link_type=abstract
Spitzer Proposal ID #41
Statistics
Scientific paper
The primary goal of the Volume Limited Sample (VLS) is to look for emission in the wavelength range from 15-160 um from solid material orbiting stars at distances of a few to a few hundred AU. Because SIRTF cannot, in most cases, resolve spatially these disks, we will make a photometric and spectro-photometric survey looking for excesses over the emission expected from the photosphere. Our ability to identify small excesses will be limited by signal-to-noise, calibration effects and photospheric models. We will make photometric measurements down to a fraction of the expected photospheric level at 24 um (~1% from photon statistics but realistically to a few percent given calibration uncertainties) and 70 um (4%, 1 sigma). To detect very cold dust and/or the largest dust grains and to provide a linkage to ground-based submillimeter measurements, we will make measurements at 160 um down to the extra-galactic confusion limit. Spectro-photometry offers a powerful method of identifying weak excesses. The VLS program uses both IRS Long-Lo (to 4% of the photosphere at 40 um) and MIPS SED (to 4% on the photosphere at 70 um on the brightest members of the sample). The spectroscopy of detected disks will constrain the spatial distribution and composition of the dust.
Beichman Charles
Rieke George
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