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28 July 2014 RHEA: the ultra-compact replicable high-resolution exoplanet and Asteroseismology spectrograph
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We present the opto-mechanical design and the characterization of the Replicable High-resolution Exoplanet and Asteroseismology (RHEA) spectrograph. RHEA is an ultra-compact fiber-fed echelle spectrograph designed to be used at 0.2-0.4 m class robotic telescopes where long term dedicated projects are possible. The instrument will be primarily used for radial velocity (RV) studies of low to intermediate-mass giant stars for the purpose of searching for hot Jupiters and using asteroseismology to simultaneously measure the host star parameters and de-correlate stellar pulsations. The optical design comprises a double-pass (i.e. near Littrow) configuration with prism cross-disperser and single-mode fiber (SMF) input. The spectrograph has a resolving power of R>70,000 and operates at 430–670 nm with minimum order separation of ~180 μm. This separation allows a 1x6 photonic lantern integration at a later stage which is currently under development. The current design is built with the aim of creating an inexpensive and replicable unit. The spectrograph is optimised for long-baseline RV observations through careful temperature stabilisation and simultaneous wavelength calibration. As a further improvement the echelle grating is housed in a vacuum chamber to maintain pressure stability. The performance of the current prototype is currently being tested on a 0.4 m telescope at the Macquarie University Observatory.
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Tobias Feger, Carlos Bacigalupo, Timothy R. Bedding, Joao Bento, David W. Coutts, Michael J. Ireland, Quentin A. Parker, Aaron Rizzuto, and Izabela Spaleniak "RHEA: the ultra-compact replicable high-resolution exoplanet and Asteroseismology spectrograph", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91477I (28 July 2014);

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