Hanle echelle spectrograph (HESP) is a high resolution, bench mounted, fiber-fed spectrograph at visible wavelengths. The instrument was recently installed at the 2m Himalayan Chandra Telescope (HCT), located at Indian Astronomical Observatory (IAO), Hanle at an altitude of 4500m. The telescope and the spectrograph are operated remotely from Bangalore,(∼ 3200km from Hanle), through a dedicated satellite link. HESP was designed and built by Kiwi Star Optics, Callaghan Innovation, New Zealand. The spectrograph has two spectral resolution modes (R=30000 and 60000). The low resolution mode uses a 100 micron fiber as a input slit and the high resolution mode is achieved using an image slicer. An R2 echelle grating, along with two cross dispersing prisms provide a continuous wavelength coverage between 350-1000nm. The spectrograph is enclosed in a thermally controlled environment and provides a stability of 200m/s during a night. A simultaneous thorium-argon calibration provides a radial velocity precision of 20m/s. Here, we present a design overview, performance and commissioning of the spectrograph.
We report on the development and construction of a new fiber-fed, red-optical, high-precision radial-velocity spectrograph for one of the twin 6.5m Magellan Telescopes in Chile. MAROON-X will be optimized to find and characterize rocky planets around nearby M dwarfs with an intrinsic per measurement noise floor below 1ms-1. The instrument is based on a commercial echelle spectrograph customized for high stability and throughput. A microlens array based pupil slicer and double scrambler, as well as a rubidium-referenced etalon comb calibrator will turn this spectrograph into a high-precision radial-velocity machine. MAROON-X will undergo extensive lab tests in the second half of 2016.
A new advanced high resolution spectrograph has been developed by Kiwistar Optics of Industrial Research
Ltd., New Zealand. The instrument, KiwiSpec R4-100, is bench-mounted, bre-fed, compact (0.75m by 1.5m
footprint), and is well-suited for small to medium-sized telescopes. The instrument makes use of several advanced
concepts in high resolution spectrograph design. The basic design follows the classical white pupil concept in
an asymmetric implementation and employs an R4 echelle grating illuminated by a 100mm diameter collimated
beam for primary dispersion. A volume phase holographic grating (VPH) based grism is used for cross-dispersion.
The design also allows for up to four camera and detector channels to allow for extended wavelength coverage at
high eciency. A single channel prototype of the instrument has been built and successfully tested with a 1m
telescope. Targets included various spectrophotometric standard stars and several radial velocity standard stars
to measure the instrument's light throughput and radial velocity capabilities. The prototype uses a 725 lines/mm
VPH grism, an off-the-shelf camera objective, and a 2k×2k CCD. As such, it covers the wavelength range from
420nm to 660nm and has a resolving power of R ≈ 40,000. Spectrophotometric and precision radial velocity
results from the on-sky testing period will be reported, as well as results of laboratory-based measurements. The
optical design of KiwiSpec, and the various multi-channel design options, will be presented elsewhere in these