Gemini Planet Imager Observational Calibrations III: Empirical Measurement Methods and Applications of High-Resolution Microlens PSFs

摘要

The newly commissioned Gemini Planet Imager (GPI) combines extreme adaptiveoptics, an advanced coronagraph, precision wavefront control and alenslet-based integral field spectrograph (IFS) to measure the spectra of youngextrasolar giant planets between 0.9-2.5 um. Each GPI detector image, when inspectral model, consists of ~37,000 microspectra which are under or criticallysampled in the spatial direction. This paper demonstrates how to obtainhigh-resolution microlens PSFs and discusses their use in enhancing thewavelength calibration, flexure compensation and spectral extraction. Thismethod is generally applicable to any lenslet-based integral field spectrographincluding proposed future instrument concepts for space missions.