Design and testing of a low-resolution NIR spectrograph for the EXoplanet Climate Infrared TElescope

Lee Bernard; Johnathan Gamaunt; Logan Jensen; Andrea Bocchieri; Nat Butler; Quentin Changeat; Azzurra D'Alessandro; Billy Edwards; Conor Earley; Qian Gong; John Hartley; Kyle Helson; Daniel P. Kelly; Kanchita Klangboonkrong; Annalies Kleyheeg; Nikole Lewis; Steven Li; Michael Line; Stephen F. Maher; Ryan McClelland; Laddawan R. Miko; Lorenzo V. Mugnai; Peter Nagler; C. Barth Netterfield; Vivien Parmentier; Enzo Pascale; Jennifer Patience; Tim Rehm; Javier Romualdez; Subhajit Sarkar; Paul Scowen; Greg Tucker; Augustyn Waczynski; Ingo Waldmann

doi:10.1117/12.3019286

30 July 2024 Design and testing of a low-resolution NIR spectrograph for the EXoplanet Climate Infrared TElescope

Lee Bernard, Johnathan Gamaunt, Logan Jensen, Andrea Bocchieri, Nat Butler, Quentin Changeat, Azzurra D'Alessandro, Billy Edwards, Conor Earley, Qian Gong, John Hartley, Kyle Helson, Daniel P. Kelly, Kanchita Klangboonkrong, Annalies Kleyheeg, Nikole Lewis, Steven Li, Michael Line, Stephen F. Maher, Ryan McClelland, Laddawan R. Miko, Lorenzo V. Mugnai, Peter Nagler, C. Barth Netterfield, Vivien Parmentier, Enzo Pascale, Jennifer Patience, Tim Rehm, Javier Romualdez, Subhajit Sarkar, Paul Scowen, Greg Tucker, Augustyn Waczynski, Ingo Waldmann

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 13096A5 (2024) https://doi.org/10.1117/12.3019286
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The EXoplanet Climate Infrared TElescope (EXCITE) is a near-infrared spectrograph (0.8-3.5 μm, R∼50) designed for measuring spectroscopic phase curves of transiting hot Jupiter-type exoplanets that operates off a high-altitude balloon platform. Phase curves produce a combination of phase curve and transit/eclipse spectroscopy, providing a wealth of information for characterizing exoplanet atmospheres. EXCITE will be a firstof- kind dedicated telescope uniquely able to observe a target nearly uninterrupted for tens of hours, enabling phase curve measurements, and complementing JWST. The spectrometer has two channels, a 0.8-2.5 μm band and a 2.5-3.5 μm band, providing a spectrum with a spectral resolution of R≥50. Two Off-Axis Parabolic (OAP) mirrors reimage the telescope focal plane to provide on-axis, diffraction-limited performance, wth a CaF2 prism providing dispersion. The spectrum is imaged with a single JWST flight spare Teledyne H2RG detector, providing Nyquist sampling of each channel. Here, we discuss the spectrograph’s mechanical design, acceptance testing, assembly, and cryostat integration.

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Lee Bernard, Johnathan Gamaunt, Logan Jensen, Andrea Bocchieri, Nat Butler, Quentin Changeat, Azzurra D'Alessandro, Billy Edwards, Conor Earley, Qian Gong, John Hartley, Kyle Helson, Daniel P. Kelly, Kanchita Klangboonkrong, Annalies Kleyheeg, Nikole Lewis, Steven Li, Michael Line, Stephen F. Maher, Ryan McClelland, Laddawan R. Miko, Lorenzo V. Mugnai, Peter Nagler, C. Barth Netterfield, Vivien Parmentier, Enzo Pascale, Jennifer Patience, Tim Rehm, Javier Romualdez, Subhajit Sarkar, Paul Scowen, Greg Tucker, Augustyn Waczynski, and Ingo Waldmann "Design and testing of a low-resolution NIR spectrograph for the EXoplanet Climate Infrared TElescope", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 13096A5 (30 July 2024); https://doi.org/10.1117/12.3019286

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