| DOI | Resolve DOI: https://doi.org/10.1117/12.2055752 |
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| Author | Search for: Savransky, Dmitry; Search for: Thomas, Sandrine J.; Search for: Poyneer, Lisa A.; Search for: Dunn, Jennifer1 ; Search for: MacIntosh, Bruce A.; Search for: Sadakuni, Naru; Search for: Dillon, Daren; Search for: Goodsell, Stephen J.; Search for: Hartung, Markus; Search for: Hibon, Pascale; Search for: Rantakyrö, Fredrik; Search for: Cardwell, Andrew; Search for: Serio, Andrew |
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| Name affiliation | - National Research Council Canada. National Science Infrastructure
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| Format | Text |
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| Type | Article |
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| Proceedings title | SPIE - International Society for Optical Engineering. Proceedings |
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| Conference | Ground-Based and Airborne Instrumentation for Astronomy V, 22 June 2014 through 26 June 2014 |
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| ISSN | 0277-786X |
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| ISBN | 9780819496157 |
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| Volume | 9147 |
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| Article number | 914740 |
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| Subject | Adaptive optics; Alignment; Astronomy; Automated operations; Gemini Planet Imager; GPI; High contrast imaging; Extrasolar planets |
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| Abstract | 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. |
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| Publication date | 2014-07-08 |
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| Publisher | SPIE |
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| Terms of use | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21275493 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction |
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Record identifier | b791c626-954d-4a95-85c6-bcbc53238c0c | | Record created | 2015-07-14 |
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| Record modified | 2017-04-24 |
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