24 July 2014 Gemini planet imager observational calibrations X: non-redundant masking on GPI
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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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alexandra Z. Greenbaum, Alexandra Z. Greenbaum, Anthony Cheetham, Anthony Cheetham, Anand Sivaramakrishnan, Anand Sivaramakrishnan, Peter Tuthill, Peter Tuthill, Barnaby Norris, Barnaby Norris, Laurent Pueyo, Laurent Pueyo, Naru Sadakuni, Naru Sadakuni, Fredrik Rantakyrö, Fredrik Rantakyrö, Pascale Hibon, Pascale Hibon, Stephen Goodsell, Stephen Goodsell, Markus Hartung, Markus Hartung, Andrew Serio, Andrew Serio, Andrew Cardwell, Andrew Cardwell, Lisa Poyneer, Lisa Poyneer, Bruce Macintosh, Bruce Macintosh, Dmitry Savransky, Dmitry Savransky, Marshall D. Perrin, Marshall D. Perrin, Schuyler Wolff, Schuyler Wolff, Patrick Ingraham, Patrick Ingraham, Sandrine Thomas, Sandrine Thomas, } "Gemini planet imager observational calibrations X: non-redundant masking on GPI", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91477B (24 July 2014); doi: 10.1117/12.2056429; https://doi.org/10.1117/12.2056429
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