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PARAS-2 precision radial velocimeter: optical and mechanical design of a fiber-fed high resolution spectrograph under vacuum and temperature control

Chakraborty, Abhijit and Thapa, Nitesh and Kumar, Kapil and Neelam, Prasad J. S. S. V. and Sharma, Rishikesh and Roy, Arpita (2018) PARAS-2 precision radial velocimeter: optical and mechanical design of a fiber-fed high resolution spectrograph under vacuum and temperature control. In: Ground-based and Airborne Instrumentation for Astronomy VII. Proceedings of SPIE. No.10702. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 107026G. ISBN 9781510619579. https://resolver.caltech.edu/CaltechAUTHORS:20190103-153504003

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Abstract

We present here the optical and mechanical design of a fiber-fed High-resolution spectrograph at resolution (R) = 100,000 which will be under vacuum (0.001 to 0.005 mbar) and temperature controlled environment at 25C ± 0.001C. The spectrograph will be attached to our upcoming new PRL 2.5m aperture telescope at Gurushikar, Mount Abu, Rajasthan, India. The spectrograph is named PARAS-2 after the successful operation of PARAS (PARAS-1) with our existing 1.2m aperture telescope at Gurushikar, Mount Abu since 2012 summer. The spectrograph (PARAS-2) will be operating in the range of 380nm to 690nm wavelength in a single shot using Grism as a Cross Disperser, R4 Echelle at blaze angle of 76degrees, and pupil diameter of 200 mm. We will use a combination of octagonal and circular fibers along with double scrambler and simultaneous calibration for getting down to the RV precision of 50cm/s or better (< 50cm/s). Minimum 30% time will be reserved for exoplanet work with the spectrograph on the 2.5m telescope when it becomes operational in early 2020. The overall efficiency of the whole spectrograph (Echelle, M1, M2, FM, Grism, Camera lens system, Dewar window) excluding fiber is expected to be 22.5% - 28% and 4% - 8% including optical fiber, telescope and fibertelescope interface losses.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2313055DOIBook Section
ORCID:
AuthorORCID
Sharma, Rishikesh0000-0001-8983-5300
Roy, Arpita0000-0001-8127-5775
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). This entire project is funded by PRL & DOS, India. We are thankful to the PRL Director and DOS for support and funding. We also acknowledge the help from Francesco Pepe (Geneva Observatory) and Andrew Szentgyorgyi (Smithsonian Astrophysical Observatory, Harvard) for sharing the HARPS Grism design. We are thankful to Andrew Szentgyorgyi (SAO, Harvard) for reviewing the entire Spectrograph design and giving us very useful comments. The authors would also like to thank at PRL whose continuing valuable support has made this project possible. We acknowledge the help from Vishal Shah, Kevikumar Lad, Ashirbad Nayak from PRL, and D. Subramanyam (retired) from SAC, ISRO, India.
Funders:
Funding AgencyGrant Number
Physical Research Laboratory (India)UNSPECIFIED
Department of Space (India)UNSPECIFIED
Subject Keywords:High resolution Spectroscopy, Echelle, Grism, Exoplanets
Series Name:Proceedings of SPIE
Issue or Number:10702
Record Number:CaltechAUTHORS:20190103-153504003
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190103-153504003
Official Citation:Abhijit Chakraborty, Nitesh Thapa, Kapil Kumar, Prasad J. S. S. V. Neelam, Rishikesh Sharma, Arpita Roy, "PARAS-2 precision radial velocimeter: optical and mechanical design of a fiber-fed high resolution spectrograph under vacuum and temperature control," Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107026G (20 July 2018); doi: 10.1117/12.2313055
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92053
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:07 Jan 2019 15:36
Last Modified:03 Oct 2019 20:40

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