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Proceedings Paper

The upgrade of HARPS to a full-Stokes high-resolution spectropolarimeter
Author(s): Frans Snik; Sandra Jeffers; Christoph Keller; Nikolai Piskunov; Oleg Kochukhov; Jeff Valenti; Christopher Johns-Krull
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Paper Abstract

We present the design of a compact module that converts the HARPS instrument at the 3.6-m telescope at La Silla to a full-Stokes high-resolution spectropolarimeter. The polarimeter will replace the obsolete Iodine cell inside the HARPS Cassegrain adapter. Utilizing the two fibers going into the spectrograph, two dual-beam systems can be positioned in the beam: one with a rotating superachromatic quarter-wave plate for circular polarimetry and one with a rotating superachromatic half-wave plate for linear polarimetry. A large polarimetric precision is ensured by the beam-exchange technique and a minimal amount of instrumental polarization. The polarimeter, in combination with the ultra-precise HARPS spectrograph, enables unprecedented observations of stellar magnetic fields and circumstellar material without compromising the successful planet-finding program.

Paper Details

Date Published: 9 July 2008
PDF: 10 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70140O (9 July 2008); doi: 10.1117/12.787393
Show Author Affiliations
Frans Snik, Sterrekundig Instituut Utrecht (Netherlands)
Sandra Jeffers, Sterrekundig Instituut Utrecht (Netherlands)
Christoph Keller, Sterrekundig Instituut Utrecht (Netherlands)
Nikolai Piskunov, Uppsala Univ. (Sweden)
Oleg Kochukhov, Uppsala Univ. (Sweden)
Jeff Valenti, Space Telescope Science Institute (United States)
Christopher Johns-Krull, Rice Univ. (United States)

Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)

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