A dual-beam spectrograph design for transient follow-up with SALT

Janus D. Brink; John W. Menzies; Ockert J. Strydom; Melanie Saayman

doi:10.1117/12.2560996

13 December 2020 A dual-beam spectrograph design for transient follow-up with SALT

Janus D. Brink, John W. Menzies, Ockert J. Strydom, Melanie Saayman

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 1144768 (2020) https://doi.org/10.1117/12.2560996
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

We present a low-resolution spectrograph design for the Southern African Large Telescope (SALT) primarily aimed at efficient identification spectroscopy of transients. The design extends the existing Robert-Stobie Spectrograph (RSS) by adding a new simultaneous red channel for wide visible wavelength coverage (360 nm to 900 nm). The design delivers R ~800 in the blue channel using the existing RSS optics and R ~2000 at a peak end-to-end instrument efficiency of 44% via the new red channel. We describe the instrument’s requirements, optical design and expected performance. Synergies with existing RSS functionality are explored that will allow dual-beam multi-object and future integral field unit spectroscopy.

Conference Presentation

Citation Download Citation

Janus D. Brink, John W. Menzies, Ockert J. Strydom, and Melanie Saayman "A dual-beam spectrograph design for transient follow-up with SALT", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 1144768 (13 December 2020); https://doi.org/10.1117/12.2560996

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