9 August 2016 Performance and future developments of the RHEA single-mode spectrograph
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Abstract
The Replicable High-resolution Exoplanet and Asteroseismology (RHEA) spectrograph is being developed to serve as a basis for multiple copies across a network of small robotic telescopes. The spectrograph operates at the diffraction-limit by using a single-mode fiber input, resulting in a compact and modal-noise-free unit. The optical design is mainly based on off-the-shelf available components and comprises a near-Littrow configuration with prism cross-disperser. The échelle format covers a wavelength range of 430-650 nm at R=75,000 resolving power. In this paper we briefly summarize the current status of the instrument and present preliminary results from the first on-sky demonstration of the prototype using a fully automated 16" telescope, where we observe stable and semi-variable stars up to V=3.5 magnitude. Future steps to enhance the efficiency and passive stability of RHEA are discussed in detail. For example, we show the concept of using a multi-fiber injection unit, akin to a photonic lantern, which not only enables increased throughput but also offers simultaneous wavelength calibration.
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Joao Bento, Joao Bento, Tobias Feger, Tobias Feger, Michael J. Ireland, Michael J. Ireland, Adam Rains, Adam Rains, Nemanja Jovanovic, Nemanja Jovanovic, David W. Coutts, David W. Coutts, Christian Schwab, Christian Schwab, Alexander Arriola , Alexander Arriola , Simon Gross, Simon Gross, } "Performance and future developments of the RHEA single-mode spectrograph", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99086K (9 August 2016); doi: 10.1117/12.2232371; https://doi.org/10.1117/12.2232371
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