19 August 2009 The Gemini Planet Imager coronagraph testbed
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The Gemini Planet Imager (GPI) is a new facility instrument to be commissioned at the 8-m Gemini South telescope in early 2011. It combines of several subsystems including a 1500 subaperture Extreme Adaptive Optics system, an Apodized Pupil Lyot Coronagraph, a near-infrared high-accuracy interferometric wavefront sensor, and an Integral Field Unit Spectrograph, which serves as the science instrument. GPI's main scientific goal is to detect and characterize relatively young (<2GYr), self luminous planets with planet-star brightness ratios of ≤ 10-7 in the near infrared. Here we present an overview of the coronagraph subsystem, which includes a pupil apodization, a hard-edged focal plane mask and a Lyot stop. We discuss designs optimization, masks fabrication and testing. We describe a near infrared testbed, which achieved broadband contrast (H-band) below 10-6 at separations > 5λ/D, without active wavefront control (no deformable mirror). We use Fresnel propagation modeling to analyze the testbed results.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rémi Soummer, Rémi Soummer, Anand Sivaramakrishnan, Anand Sivaramakrishnan, Ben R. Oppenheimer, Ben R. Oppenheimer, Robin Roberts, Robin Roberts, Douglas Brenner, Douglas Brenner, Alexis Carlotti, Alexis Carlotti, Laurent Pueyo, Laurent Pueyo, Bruce Macintosh, Bruce Macintosh, Brian Bauman, Brian Bauman, Les Saddlemyer, Les Saddlemyer, David Palmer, David Palmer, Darren Erickson, Darren Erickson, Christophe Dorrer, Christophe Dorrer, Kris Caputa, Kris Caputa, Christian Marois, Christian Marois, Kent Wallace, Kent Wallace, Emily Griffiths, Emily Griffiths, Jacob Mey, Jacob Mey, } "The Gemini Planet Imager coronagraph testbed", Proc. SPIE 7440, Techniques and Instrumentation for Detection of Exoplanets IV, 74400R (19 August 2009); doi: 10.1117/12.826700; https://doi.org/10.1117/12.826700

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