Veloce Rosso: Australia's new precision radial velocity spectrograph
James Gilbert, Christoph Bergmann, Gabe Bloxham, Robert Boz, Robert, Brookfield, Tom Carkic, Brad Carter, Scott Case, Vladimir Churilov, Michael, Ellis, Gaston Gausachs, Luke Gers, Doug Gray, Nicholas Herrald, Michael, Ireland, Damien Jones, Yevgen Kripak, Jon Lawrence

TL;DR
Veloce Rosso is a highly stable, cost-effective spectrograph designed for precise radial velocity measurements of Sun-like and M-dwarf stars, achieving sub-meter per second accuracy for exoplanet detection.
Contribution
It introduces innovative low-cost design features and advanced calibration methods to enhance precision in a compact, stable spectrograph for the AAT.
Findings
Achieves <1 m/s radial velocity precision.
Maintains thermal stability of +/-0.01 K.
Operates effectively over 580-950 nm wavelength range.
Abstract
Veloce is an ultra-stable fibre-fed R4 echelle spectrograph for the 3.9 m Anglo-Australian Telescope. The first channel to be commissioned, Veloce 'Rosso', utilises multiple low-cost design innovations to obtain Doppler velocities for Sun-like and M-dwarf stars at <1 m/s precision. The spectrograph has an asymmetric white-pupil format with a 100-mm beam diameter, delivering R>75,000 spectra over a 580-950 nm range for the Rosso channel. Simultaneous calibration is provided by a single-mode pulsed laser frequency comb in tandem with a traditional arc lamp. A bundle of 19 object fibres provides a 2.4" field of view for full sampling of stellar targets from the AAT site. Veloce is housed in dual environmental enclosures that maintain positive air pressure at a stability of +/-0.3 mbar, with a thermal stability of +/-0.01 K on the optical bench. We present a technical overview and early…
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