The HARPS Polarimeter
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Publication date
2010-05-30
Authors
Snik, F.
Kochukhov, O.
Piskunov, N.
Rodenhuis, M.
Jeffers, S.V.
Keller, C.U.
Dolgopolov, A.
Stempels, H. C.
Makaganiuk, V.
Valenti, J.
Editors
Kuhn, J.R.
Berdyugina, S.V.
Harrington, D.M.
Keil, S.L.
Rimmele, T.
Trujillo-Bueno, J.
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Abstract
We recently commissioned the polarimetric upgrade of the HARPS spectrograph at ESO’s 3.6-m telescope at La Silla, Chile. The HARPS polarimeter is capable of full Stokes spectropolarimetry with large sensitivity and accuracy, taking advantage of the large spectral resolution and stability of HARPS. In this paper we present the instrument design and its polarimetric performance. The first HARPSpol observations show that it can attain a polarimetric sensitivity of ∼10−5 (after addition of many lines) and that no significant instrumental polarization effects are present.
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Snik, F, Kochukhov, O, Piskunov, N, Rodenhuis, M, Jeffers, S V, Keller, C U, Dolgopolov, A, Stempels, H C, Makaganiuk, V, Valenti, J & Johns-Krull, C 2010, The HARPS Polarimeter. in J R Kuhn, S V Berdyugina, D M Harrington, S L Keil, T Rimmele & J Trujillo-Bueno (eds), Solar polarization 6 : proceedings of a Solar polarization conference held at Sheraton Lahaina, Maui HI, USA, May 30 to June 4 2010. Astronomical Society of the Pacific, San Francisco, pp. 237-244.