Pointing effects and their consequences for Spitzer IRAC exoplanet observations

摘要

Spitzer observations of exoplanets routinely yield accuracies of better than one part in 10,000. However, there remain anumber of issues that limit the attainable precision, particularly for long duration observations. These include initialpointing inaccuracies, pointing wobble, initial target drift, long-term pointing drifts, and low and high frequency jitter.Coupled with small scale, intrapixel sensitivity variations, all of these pointing issues have the potential to producesignificant, correlated photometric noise. We examine each of these issues in turn, discussing their suspected causes andconsequences, and describing possible and planned mitigation techniques.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.