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Hanle echelle spectrograph: design and performance
Author(s): S. Sriram; Amit Kumar; Arun Surya; T. Sivarani; Sunetra Giridhar; S. Kathiravan; M. N. Anand; Damien Jones; Deon Grobler; Robert Jakobsson; Anantha Chanumolu; Athira Unni; Angchuk Dorje; Tsewang Dorje; Tsewang Gyalson
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Paper Abstract

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.

Paper Details

Date Published: 6 July 2018
PDF: 15 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107026K (6 July 2018); doi: 10.1117/12.2313165
Show Author Affiliations
S. Sriram, Indian Institute of Astrophysics (India)
Amit Kumar, Indian Institute of Astrophysics (India)
Arun Surya, Indian Institute of Astrophysics (India)
T. Sivarani, Indian Institute of Astrophysics (India)
Sunetra Giridhar, Indian Institute of Astrophysics (India)
S. Kathiravan, Indian Institute of Astrophysics (India)
M. N. Anand, Indian Institute of Technology Patna (India)
Damien Jones, Prime Optics (Australia)
Deon Grobler, Callaghan Innovation (New Zealand)
Robert Jakobsson, Callaghan Innovation (New Zealand)
Anantha Chanumolu, Indian Institute of Astrophysics (India)
SRON (Netherlands)
Athira Unni, Indian Institute of Astrophysics (India)
Angchuk Dorje, Indian Institute of Astrophysics (India)
Tsewang Dorje, Indian Institute of Astrophysics (India)
Tsewang Gyalson, Indian Institute of Astrophysics (India)

Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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