Statistics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20547t&link_type=abstract
Spitzer Proposal ID #20547
Statistics
Scientific paper
We will conduct a comprehensive statistical appraisal of debris dust disks around normal stars. We will work with Spitzer MIPS 24 and 70 micron fluxes for 946 stars from 10 programs. For each star we compare the observed fluxes with those expected from a model stellar atmosphere. Approximately 15% of stars will show excess emission at 70 microns, from dust in debris disks 10 -- 100 AU from the stars. We will apply survival statistics to estimate the distribution of the number of stars with a given flux excess. We will estimate these distributions separately for stars of different spectral type, different metallicity and for those with and without planets. Survival statistics are ideal for this problem because they make full use of all the information in both the numerous upper limits and the occasional detections of excess flux. We will also sum MIPS images of various groups of 10 -- 100 stars of specific types. These sums average over the varying background which is a major source of error at 70 microns. For stars with low S/N detections or no detections of the stellar photospheres at 70 microns, the sums will promote non-detections into composite detections, with approximately 3 -- 10 times more sensitivity than individual images.
Beichman Charles
Bryden Geoffrey
Kirkman David
Tytler David
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