Henrietta: a low-resolution, high-precision exoatmosphere spectrograph for Las Campanas Observatory

Jason E. Williams; Nicholas P. Konidaris II; Tyson S. Hare; Julia Brady; Christoph Birk; Johanna K. Teske; Daniel D. Kelson; Gwen C. Rudie; Andrew B. Newman

doi:10.1117/12.2630576

29 August 2022 Henrietta: a low-resolution, high-precision exoatmosphere spectrograph for Las Campanas Observatory

Jason E. Williams, Nicholas P. Konidaris II, Tyson S. Hare, Julia Brady, Christoph Birk, Johanna K. Teske, Daniel D. Kelson, Gwen C. Rudie, Andrew B. Newman

Author Affiliations +

Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 1218463 (2022) https://doi.org/10.1117/12.2630576
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

We present the design of Henrietta, is a wide-band (0.6 - 2.4 µm) low resolution spectrograph located at the 1-m Swope Telescope in Las Campanas Observatory. Henrietta is designed to routinely suppress instrumental variations in spectrophotometric flux in order to reach the photon noise limit. The primary way Henrietta achieves this is by employing a wide-slit at the telescope focal plane to mitigate time-dependent slit losses; employing a diffusing optical element to broaden the shape of the PSF and mitigate flux variations due to the intra-pixel quantum efficiency variations; a wide field-of-view for access to reference stars with similar brightness and spectral type; and minimizing the number of optical elements to keep throughput high across a wide spectral range. Henrietta is currently in the integration and testing phase and will begin science operations in early 2023.

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Jason E. Williams, Nicholas P. Konidaris II, Tyson S. Hare, Julia Brady, Christoph Birk, Johanna K. Teske, Daniel D. Kelson, Gwen C. Rudie, and Andrew B. Newman "Henrietta: a low-resolution, high-precision exoatmosphere spectrograph for Las Campanas Observatory", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 1218463 (29 August 2022); https://doi.org/10.1117/12.2630576

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KEYWORDS

Telescopes

Diffusers

Sensors

Stars

Point spread functions

Cameras

Spectrographs

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