We present the updated design of HighSpec, a high-resolution R ∼ 20, 000 spectrograph designed for the Multi Aperture Spectroscopic Telescope (MAST). HighSpec offers three observing modes centered at the Ca II H&K, Mgb triplet, and Hα lines. Each mode is supported by a highly optimized ion-etched grating, contributing to an instrument exceptional peak efficiency of ≳ 85% for the two latter bands (≳ 55% for the Ca II H&K band). Optimizing throughput over wavelength coverage (Δλ = 10−17 nm), HighSpec enables the precise measurement of spectral lines from faint targets. This approach is especially relevant for stellar object studies, specifically of WDs, which are intrinsically faint and have few spectroscopic lines. Each observing mode was tailored to target spectral features essential for WD research. Its integration with MAST, an array of 20 custom-designed telescopes that can function as a single large telescope (equivalent to a 2.7m telescope in collecting area) or multiplexing over the entire sky, provides unique adaptability for extensive and effective spectroscopic campaigns. Currently in its final assembly and testing stages, HighSpec’s on-sky commissioning is scheduled for 2025.
We present HighSpec – a spectrograph designed for the Multi-Aperture-Spectroscopic Telescope (MAST). HighSpec’s novel optical setup achieves high spectral resolution of R ∼ 20, 000, while maintaining an exceptionally high throughput with a peak efficiency of ≳ 55% over a narrow band-pass of ∼ 140 A. This is made possible by using highly optimized ion-etched binary mask gratings and an electron-multiplying CCD (EMCCD) detector. HighSpec will include three gratings which will be centered at the Ca II H&K lines, the Mgb lines, and the Hα line. Therefore, HighSpec is highly versatile. Its potential science cases include systematic surveys of flaring M dwarfs; Doppler tomography studies of exoplanet obliquity; dynamical studies of the local population of short-period double white dwarfs; and follow-up of candidate dormant black holes and neutrons stars in binary system.
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