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29 August 2022 Design and testing of a low-resolution NIR spectrograph for the EXoplanet Climate Infrared TElescope
Lee Bernard, Logan Jensen, John Gamaunt, Nat Butler, Andrea Bocchieri, Quentin Changeat, Azzurra D'Alessandro, Billy Edwards, Qian Gong, John Hartley, Kyle Helson, Dan Kelly, Kanchita Klangboonkrong, Annalies Kleyheeg, Nikole Lewis, Steven Li, Michael Line, Stephen Maher, Ryan McClelland, Laddawan Miko, Lorenzo Mugnai, Peter Nagler, Barth Netterfield, Vivien Parmentier, Enzo Pascale, Jennifer Patience, Tim Rehm, Javier Romualdez, Subhajit Sarkar, Paul Scowen, Gregory S. Tucker, Augustyn Waczynski, Ingo Waldman
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Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 1218429 (2022) https://doi.org/10.1117/12.2629717
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
Abstract
The EXoplanet Climate Infrared TElescope (EXCITE) experiment is a balloon-borne, purpose-designed mission to measure spectroscopic phase curves of short-period extrasolar giant planets (EGPs, or “hot Jupiters”). Here, we present EXCITE’s principal science instrument: a high-throughput, single-object spectrograph operating in the 0.8-2.5 µm and 2.5-4.0 µm bands with R≥50. Our compact design achieves diffraction-limited, on-axis performance with just three powered optics: two off-axis parabolic mirrors and a CaF2 prism. We discuss the optical and mechanical design, the expected optical performance of the spectrograph, and summarize the tolerances needed to achieve that performance. We also discuss plans for establishing alignment of the optics and verifying the optical performance.
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Lee Bernard, Logan Jensen, John Gamaunt, Nat Butler, Andrea Bocchieri, Quentin Changeat, Azzurra D'Alessandro, Billy Edwards, Qian Gong, John Hartley, Kyle Helson, Dan Kelly, Kanchita Klangboonkrong, Annalies Kleyheeg, Nikole Lewis, Steven Li, Michael Line, Stephen Maher, Ryan McClelland, Laddawan Miko, Lorenzo Mugnai, Peter Nagler, Barth Netterfield, Vivien Parmentier, Enzo Pascale, Jennifer Patience, Tim Rehm, Javier Romualdez, Subhajit Sarkar, Paul Scowen, Gregory S. Tucker, Augustyn Waczynski, and Ingo Waldman "Design and testing of a low-resolution NIR spectrograph for the EXoplanet Climate Infrared TElescope", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 1218429 (29 August 2022); https://doi.org/10.1117/12.2629717
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KEYWORDS
Spectrographs
Mirrors
Tolerancing
Collimation
Prototyping
Telescopes
Optical alignment
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