Characterizing Atmospheric Absorption for Precision Photometry

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Scientific paper

For the next generation of ground-based imaging surveys, many of which will be attempting to achieve better than 1% photometry, precise calibration of all aspects of the observations will be a necessity. This focus on calibration together with the detailed characterization and understanding of possible systematic effects crucial in order to reach the scientific goals of LSST, as well as several nearer term projects such as the Dark Energy Survey and other related surveys. In order to study all possible effects, we have taken a fresh look at astronomical calibration, and have begun an effort to quantify a variety of possible systematics. We have broken the problem down into (a) the telescope system and (b) the atmospheric effects. For the telescope system we have attacked the problem of understanding the end-to-end telescope transmission function with a novel tunable laser setup. Here we propose to use the CTIO 1.5m CSPEC and the CTIO 1.0m concurrently, together with all-sky IR imaging and an experimental stand-alone multi- band imaging camera/telescope system, to further our study of the atmospheric effects on precision photometric measurements. Our efforts are specifically aimed at evaluating and eventually establishing methods for precise calibration of LSST data, but will also educate nearer term survey calibration procedures.

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