Spectropolarimetry with CRIRES: technical aspects and scientific potential

Details Spectropolarimetry with CRIRES: technical aspects and scientific potential Spectropolarimetry with CRIRES: technical aspects and scientific potential

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4843..223k&link_type=abstract

Polarimetry in Astronomy. Edited by Silvano Fineschi . Proceedings of the SPIE, Volume 4843, pp. 223-232 (2003).

Astronomy and Astrophysics

Astronomy

2

Scientific paper

ESO is presently building an adaptive-optics fed Cryogenic Infrared Echelle Spectrograph (CRIRES) for the VLT-observatory operating in the wavelength range from 1-5μm. Spectro-polarimetry with a focus on circular polarization in the infrared is particularly interesting as the ratio of Zeeman-splitting to intrinsic line widths improves linearly with wavelength. Also the contrast between absorption lines in starspots and the surrounding photosphere becomes more favourable when observing a longer wavelengths (i.e. closer to the Jeans-case). Moreover it is well known that even extremely red objects such as Brown Dwarf candidates show X-ray emission and hence must have magnetic activity. CRIRES shall be equipped with a reflective phase retarder and a Wollaston-prism allowing nearly un-compromised measurements of circular polarization at a spectral resolution of 100000. Linear polarization measurements are also possible, but most likely with compromised performance. We show preview spectra of Zeeman sensitive transitions in the infrared based on Fourier-transform spectra of sunspots from literature.

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