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 contribution

7 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationGround-Based and Airborne Instrumentation for Astronomy VI
EditorsChristopher J. Evans, Luc Simard, Hideki Takami
Place of PublicationBellingham, Washington
PublisherSPIE
Pages1-11
Number of pages11
ISBN (Electronic)9781510601956
DOIs
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
PublisherSPIE
Volume9908
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherGround-Based and Airborne Instrumentation for Astronomy VI
CountryUnited Kingdom
CityEdinburgh
Period26/06/1630/06/16

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Keywords

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

Cite this

Bento, J., Feger, T., Ireland, M. J., Rains, A., Jovanovic, N., Coutts, D. W., ... Gross, S. (2016). Performance and future developments of the RHEA single-mode spectrograph. In C. J. Evans, L. Simard, & H. Takami (Eds.), Ground-Based and Airborne Instrumentation for Astronomy VI (pp. 1-11). [99086K] (Proceedings of SPIE; Vol. 9908). Bellingham, Washington: SPIE. https://doi.org/10.1117/12.2232371