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29 August 2022 MARVEL: optical design for the spectrograph
Jacob Pember, Christian Schwab, Gert Raskin
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Proceedings Volume 12184, Ground-based and Airborne Instrumentation for Astronomy IX; 121844P (2022) https://doi.org/10.1117/12.2629082
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
Abstract
MARVEL is an upcoming facility which comprises an array of four 0.8 m telescopes, each feeding via fibre link into a single high-resolution echelle spectrograph. The facility is designed to provide dedicated reconnaissance and follow-up observational capability for exoplanet searches through radial velocity measurements at a precision of 1 m s−1 . The optical design of the MARVEL spectrograph is built around a white pupil relay with a single parabolic mirror, a prism as cross-disperser, and a purely spherical refractive camera. The spectrograph records a wavelength range of 380–950 nm at spectral resolution R∼90,000 in a single arm with a large CCD detector. The final design has intentionally been kept simple, avoiding aspheric optics and using readily available high transmission glasses. We present an overview of the requirements and optical design process; a brief discussion of the design avenues that were considered and decided against; and details about the expected performance of the instrument’s final design.
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Jacob Pember, Christian Schwab, and Gert Raskin "MARVEL: optical design for the spectrograph", Proc. SPIE 12184, Ground-based and Airborne Instrumentation for Astronomy IX, 121844P (29 August 2022); https://doi.org/10.1117/12.2629082
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KEYWORDS
Spectrographs
Telescopes
Optical design
Spectral resolution
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