Gemini Planet imager Observational Calibrations X: Non-Redundant Masking on GPI

Abstract

The Gemini Planet Imager (GPI) Extreme Adaptive Optics Coronograph contains an interferometric mode: a 10-hole non-redundant mask (NRM) in its pupil wheel. GPI operates at $Y,J,H$, and $K$ bands, using an integral field unit spectrograph (IFS) to obtain spectral data at every image pixel. NRM on GPI is capable of imaging with a half resolution element inner working angle at moderate contrast, probing the region behind the coronagraphic spot. The fine features of the NRM PSF can provide a reliable check on the plate scale, while also acting as an attenuator for spectral standard calibrators that would otherwise saturate the full pupil. NRM commissioning data provides details about wavefront error in the optics as well as operations of adaptive optics control without pointing control from the calibration system. We compare lab and on-sky results to evaluate systematic instrument properties and examine the stability data in consecutive exposures. We discuss early on-sky performance, comparing images from integration and tests with the first on-sky images, and demonstrate resolving a known binary. We discuss the status of NRM and implications for future science with this mode.

arXiv comment14 pages, 14 figures. Proceedings of the SPIE, 9147-135

References in corpus (8)

• The Gemini Planet Imager: First Light
• LkCa 15: A Young Exoplanet Caught at Formation?
• A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527
• Sparse aperture masking at the VLT I. Faint companion detection limits for the two debris disk stars HD 92945 and HD 141569
• Phase Errors in Diffraction-Limited Imaging: Contrast Limits for Sparse Aperture Masking
• Direct Detection of the Brown Dwarf GJ 802B with Adaptive Optics Masking Interferometry
• Sparse Aperture Masking Observations of the FL Cha Pre-transitional Disk
• On-sky performance during verification and commissioning of the Gemini Planet Imager's adaptive optics system

Cited by in corpus (2)

• Dynamical Mass Measurement of the Young Spectroscopic Binary V343 Normae AaAb Resolved With the Gemini Planet Imager
• Performance of the Gemini Planet Imager Non-Redundant Mask and spectroscopy of two close-separation binaries HR 2690 and HD 142527