The Lost Flux Method: A New Algorithm for Improving the Precision of Space-Based Near-Infrared Stellar Photometry with Lossy Detectors

Details The Lost Flux Method: A New Algorithm for Improving the Precision of Space-Based Near-Infrared Stellar Photometry with Lossy Detectors The Lost Flux Method: A New Algorithm for Improving the Precision of Space-Based Near-Infrared Stellar Photometry with Lossy Detectors

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916414m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #164.14; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

The combination of undersampling stellar images with detectors that have non-uniform pixel response functions is currently diminishing the science return of some near-infrared imagers onboard the Hubble Space Telescope and the Spitzer Space Telescope. Although the recorded flux of point sources may vary significantly by using detectors with large effective intrapixel quantum efficiency variations, it is still possible to achieve excellent stellar photometry -if the image formation process inside the detector is accurately modeled. A new analysis technique called the Lost Flux Method is described and used to demonstrate how the precision of stellar photometry from an existing space-based near-infrared camera with a lossy detector can be significantly improved. A detailed analysis of multiple observations of a single bright isolated star obtained with Channel 1 of the Spitzer Space Telescope Infrared Array Camera (IRAC) instrument yields an improvement in photometric precision of more than 100% over the best results obtained with aperture photometry. This work has been supported by a grant from the National Aeronautics and Space Administration (NASA), Interagency Order No. NNG06EC81I, which was awarded by the Applied Information Systems Research (AISR) Program of NASA's Science Mission Directorate.

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