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Proceedings Paper

First light results from PARAS: the PRL Echelle Spectrograph
Author(s): Abhijit Chakraborty; Suvrath Mahadevan; Arpita Roy; Fazalahmed M. Pathan; Vishal Shah; Eric H. Richardson; Girish Ubale; Rajesh Shah
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Paper Abstract

We present the first light commissioning results from the Physical Research Laboratory (PRL) optical fiber-fed high resolution cross-dispersed Echelle Spectrograph. It is capable of a single- shot spectral coverage of 3700A to 8600A at R ~ 63,000 and is under very stable conditions of temperature (0.04°C at 23°C). In the very near future pressure control will also be achieved by enclosing the entire spectrograph in a low-pressure vacuum chamber (~0.01mbar). It is attached to a 1.2m telescope using two 50micron core optical fibers (one for the star and another for simultaneous Th-Ar spectral calibration). The 1.2m telescope is located at Mt. Abu, India, and we are guaranteed about 80 to 100 nights a year for observations with the spectrograph. The instrument will be ultimately used for radial-velocity searches of exoplanets around 1000 dwarf stars, brighter than 10th magnitude, for the next 5 years with a precision of 3 to 5m/s using the simultaneous Th-Ar spectral lamp reference technique. The spectrograph has already achieved a stability of 3.7m/s in short-term time scale and in the near future we expect the stability to be at 1m/s once we install the spectrograph inside the vacuum chamber.

Paper Details

Date Published: 20 July 2010
PDF: 10 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77354N (20 July 2010); doi: 10.1117/12.856555
Show Author Affiliations
Abhijit Chakraborty, Physical Research Lab. (India)
Suvrath Mahadevan, Ctr. for Exoplanets and Habitable Worlds,The Pennsylvania State Univ. (United States)
Arpita Roy, Ctr. for Exoplanets and Habitable Worlds,The Pennsylvania State Univ. (United States)
Fazalahmed M. Pathan, Physical Research Lab. (India)
Vishal Shah, Physical Research Lab. (India)
Eric H. Richardson, Univ. of Victoria (Canada)
Girish Ubale, Physical Research Lab. (India)
Rajesh Shah, Physical Research Lab. (India)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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