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Proceedings Paper

The Gemini Planet Imager coronagraph testbed
Author(s): Rémi Soummer; Anand Sivaramakrishnan; Ben R. Oppenheimer; Robin Roberts; Douglas Brenner; Alexis Carlotti; Laurent Pueyo; Bruce Macintosh; Brian Bauman; Les Saddlemyer; David Palmer; Darren Erickson; Christophe Dorrer; Kris Caputa; Christian Marois; Kent Wallace; Emily Griffiths; Jacob Mey
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Paper Abstract

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.

Paper Details

Date Published: 19 August 2009
PDF: 17 pages
Proc. SPIE 7440, Techniques and Instrumentation for Detection of Exoplanets IV, 74400R (19 August 2009); doi: 10.1117/12.826700
Show Author Affiliations
Rémi Soummer, Space Telescope Science Institute (United States)
American Museum of Natural History (United States)
Anand Sivaramakrishnan, American Museum of Natural History (United States)
Ben R. Oppenheimer, American Museum of Natural History (United States)
Robin Roberts, American Museum of Natural History (United States)
Douglas Brenner, American Museum of Natural History (United States)
Alexis Carlotti, Univ. de Nice Sophia Antipolis (France)
Laurent Pueyo, Jet Propulsion Lab. (United States)
Bruce Macintosh, Lawrence Livermore National Lab. (United States)
Brian Bauman, Lawrence Livermore National Lab. (United States)
Les Saddlemyer, Herzberg Institute of Astrophysics, National Research Council Canada (Canada)
David Palmer, Lawrence Livermore National Lab. (United States)
Darren Erickson, Herzberg Institute of Astrophysics, National Research Council Canada (Canada)
Christophe Dorrer, Aktiwave LLC (United States)
Kris Caputa, Herzberg Institute of Astrophysics, National Research Council Canada (Canada)
Christian Marois, Herzberg Institute of Astrophysics, National Research Council Canada (Canada)
Kent Wallace, Jet Propulsion Lab. (United States)
Emily Griffiths, American Museum of Natural History (United States)
Jacob Mey, American Museum of Natural History (United States)


Published in SPIE Proceedings Vol. 7440:
Techniques and Instrumentation for Detection of Exoplanets IV
Stuart B. Shaklan, Editor(s)

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