8 July 2014 Automated alignment and on-sky performance of the Gemini planet imager coronagraph
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The Gemini Planet Imager (GPI) is a next-generation, facility instrument currently being commissioned at the Gemini South observatory. GPI combines an extreme adaptive optics system and integral field spectrograph (IFS) with an apodized-pupil Lyot coronagraph (APLC) producing an unprecedented capability for directly imaging and spectroscopically characterizing extrasolar planets. GPI’s operating goal of 10-7 contrast requires very precise alignments between the various elements of the coronagraph (two pupil masks and one focal plane mask) and active control of the beam path throughout the instrument. Here, we describe the techniques used to automatically align GPI and maintain the alignment throughout the course of science observations. We discuss the particular challenges of maintaining precision alignments on a Cassegrain mounted instrument and strategies that we have developed that allow GPI to achieve high contrast even in poor seeing conditions.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dmitry Savransky, Dmitry Savransky, Sandrine J. Thomas, Sandrine J. Thomas, Lisa A. Poyneer, Lisa A. Poyneer, Jennifer Dunn, Jennifer Dunn, Bruce A. Macintosh, Bruce A. Macintosh, Naru Sadakuni, Naru Sadakuni, Daren Dillon, Daren Dillon, Stephen J. Goodsell, Stephen J. Goodsell, Markus Hartung, Markus Hartung, Pascale Hibon, Pascale Hibon, Fredrik Rantakyrö, Fredrik Rantakyrö, Andrew Cardwell, Andrew Cardwell, Andrew Serio, Andrew Serio, "Automated alignment and on-sky performance of the Gemini planet imager coronagraph", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914740 (8 July 2014); doi: 10.1117/12.2055752; https://doi.org/10.1117/12.2055752


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