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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 3 CONTRIBUTI IN ATTI DI CONVEGNO (Proceedings)
  4. 3.01 Contributi in Atti di convegno
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27969
Title: A unique infrared spectropolarimetric unit for CRIRES+
Authors: Piskunov, Nikolai
Stempels, Eric
Lavail, Alexis
Escuti, Michael
Snik, Frans
Dolgopolov, Andrey
Rozel, Milan
Durandet, Candice
Hatzes, Artie
Bristow, Paul
BRUCALASSI, ANNA 
Cumani, Claudio
Dorn, Reinhold J.
Haimerl, Andreas
Heiter, Ulrike
Hinterschuster, Renate
Follert, Roman
Ives, Derek
Jung, Yves
Kerber, Florian
Klein, Barbara
Lizon, Jean-Louis
Marquart, Thomas
Molina-Conde, Ignacio
Pasquini, Luca
Paufique, Jérôme
OLIVA, Ernesto 
Reiners, Ansgar
Seemann, Ulf
Stegmeier, Jörg
Tordo, Sebastien
Valenti, Elena
Issue Date: 2018
Volume: Ground-based and Airborne Instrumentation for Astronomy VII
Editors: Evans, Christopher J.; Simard, Luc; Takami, Hideki
Series: PROCEEDINGS OF SPIE 
Number: 10702
First Page: 1070234
Abstract: 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 polar- ization 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 polariza- tion. 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.
Conference Name: Ground-based and Airborne Instrumentation for Astronomy VII
Conference Place: Austin, Texas, United States
Conference Date: 10-15 June, 2018
URI: http://hdl.handle.net/20.500.12386/27969
URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10702/2313512/A-unique-infrared-spectropolarimetric-unit-for-CRIRES/10.1117/12.2313512.full
ISSN: 0277-786X
ISBN: 9781510619586
DOI: 10.1117/12.2313512
Bibcode ADS: 2018SPIE10702E..34P
Fulltext: open
Appears in Collections:3.01 Contributi in Atti di convegno

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