Performance and future developments of the RHEA single-mode spectrograph

Joao Bento*, Tobias Feger, Michael J. Ireland, Adam Rains, Nemanja Jovanovic, David W. Coutts, Christian Schwab, Alexander Arriola, Simon Gross

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

    8 Citations (Scopus)


    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.

    Original languageEnglish
    Title of host publicationGround-Based and Airborne Instrumentation for Astronomy VI
    EditorsChristopher J. Evans, Luc Simard, Hideki Takami
    Place of PublicationBellingham, Washington
    Number of pages11
    ISBN (Electronic)9781510601956
    Publication statusPublished - 2016
    EventGround-Based and Airborne Instrumentation for Astronomy VI - Edinburgh, United Kingdom
    Duration: 26 Jun 201630 Jun 2016

    Publication series

    NameProceedings of SPIE
    ISSN (Print)0277-786X
    ISSN (Electronic)1996-756X


    OtherGround-Based and Airborne Instrumentation for Astronomy VI
    Country/TerritoryUnited Kingdom


    • Exoplanets
    • High-resolution
    • Integral field unit
    • Radial velocity
    • Single-mode spectrograph


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