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A unique infrared spectropolarimetric unit for CRIRES+
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
North Carolina State Univ, Dept Elect & Comp Engn, Raleigh, NC 27695 USA.
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2018 (English)In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VII / [ed] Evans, CJ Simard, L Takami, H, SPIE-INT SOC OPTICAL ENGINEERING , 2018, article id 1070234Conference paper, Published paper (Refereed)
Abstract [en]

High-resolution infrared spectropolarimetry has many science applications in astrophysics. One of them is measuring weak magnetic fields using the Zeeman effect. Infrared domain is particularly advantageous as Zeeman splitting of spectral lines is proportional to the square of the wavelength while the intrinsic width of the line cores increases only linearly. Important science cases include detection and monitoring of global magnetic fields on solar-type stars, study of the magnetic field evolution from stellar formation to the final stages of the stellar life with massive stellar winds, and the dynamo mechanism operation across the boundary between fully-and partially-convective stars. CRIRES+ (the CRIRES upgrade project) includes a novel spectropolarimetric unit (SPU) based on polarization gratings. The novel design allows to perform beam-splitting very early in the optical path, directly after the tertiary mirror of the telescope (the ESO Very Large Telescope, VLT), minimizing instrumental polarization. The new SPU performs polarization beam-splitting in the near-infrared while keeping the telescope beam mostly unchanged in the optical domain, making it compatible with the adaptive optics system of the CRIRES+ instrument. The SPU consists of four beam-splitters optimized for measuring circular and linear polarization of spectral lines in YJ and HK bands. The SPU can perform beam switching allowing to correct for throughput in each beam and for variations in detector pixel sensitivity. Other new features of CRIRES+, such as substantially increased wavelength coverage, stability and advanced data reduction pipeline will further enhance the sensitivity of the polarimetric mode. The combination of the SPU, CRIRES+ and the VLT is a unique facility for making major progress in understanding stellar activity. In this article we present the design of the SPU, laboratory measurements of individual components and of the whole unit as well as the performance prediction for the operation at the VLT.

Place, publisher, year, edition, pages
SPIE-INT SOC OPTICAL ENGINEERING , 2018. article id 1070234
Series
Proceedings of SPIE, ISSN 0277-786X, E-ISSN 1996-756X ; 10702
Keywords [en]
Spectroscopy, Spectropolarimetry, Polarisation gratings, Stokes parameters
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-373550DOI: 10.1117/12.2313512ISI: 000452664300275ISBN: 978-1-5106-1958-6 (print)OAI: oai:DiVA.org:uu-373550DiVA, id: diva2:1279586
Conference
Conference on Ground-Based and Airborne Instrumentation for Astronomy VII, JUN 10-14, 2018, Austin, USA
Funder
Knut and Alice Wallenberg FoundationAvailable from: 2019-01-17 Created: 2019-01-17 Last updated: 2019-01-17Bibliographically approved

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Piskunov, NikolaiStempels, EricLavail, AlexisHeiter, UlrikeMarquart, Thomas

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