Laboratory experiment of densified pupil spectrograph for the Origins Space Telescope

T. Matsuo; T. P. Greene; R. R. Johnson; R. E. McMurray; T. Roellig; K. Ennico-Smith; B. P. Helvensteijn; A. Kashani; H. Shibai; T. Sumi; S. Itoh; I. Sakon; T. Yamamuro; Y. Ikeda; T. Manome; N. Iida; K. Yanagibashi; M. Kamiura

doi:10.1117/12.2560421

13 December 2020 Laboratory experiment of densified pupil spectrograph for the Origins Space Telescope

T. Matsuo, T. P. Greene, R. R. Johnson, R. E. McMurray, T. Roellig, K. Ennico-Smith, B. P. Helvensteijn, A. Kashani, H. Shibai, T. Sumi, S. Itoh, I. Sakon, T. Yamamuro, Y. Ikeda, T. Manome, N. Iida, K. Yanagibashi, M. Kamiura

Author Affiliations +

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 114436D (2020) https://doi.org/10.1117/12.2560421
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

We report on the laboratory experiments of a densified pupil spectrograph designed for mid-infrared transit spectroscopy of exoplanets. We developed a testbed consisting of a blackbody infrared light source, a densified pupil spectrograph, and a prototype JWST Si:As Impurity Band Conduction (IBC) detector array to simulate observations of a planet’s host star. In order to thermally stabilize the measurement system, we installed all of the components in a large cryogenic dewar and controlled the temperatures of the thermal source and the Si:As IBC detector. The characteristics of the spectrum formed on the detector were consistent with the designed values. The photometric precision of the densified pupil spectrograph was 14 ppm on average over the whole observing wavelength range of 8.5 to 10.5 μm. The systematic noise component of the spectrograph hidden behind the transit spectrograph was 11 ppm.

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T. Matsuo, T. P. Greene, R. R. Johnson, R. E. McMurray, T. Roellig, K. Ennico-Smith, B. P. Helvensteijn, A. Kashani, H. Shibai, T. Sumi, S. Itoh, I. Sakon, T. Yamamuro, Y. Ikeda, T. Manome, N. Iida, K. Yanagibashi, and M. Kamiura "Laboratory experiment of densified pupil spectrograph for the Origins Space Telescope", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 114436D (13 December 2020); https://doi.org/10.1117/12.2560421

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