9 August 2016 A high-resolution spectrograph for the 72cm Waltz Telescope at Landessternwarte, Heidelberg
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Abstract
The Waltz Spectrograph is a fiber-fed high-resolution échelle spectrograph for the 72 cm Waltz Telescope at the Landessternwarte, Heidelberg. It uses a 31.6 lines/mm 63.5° blaze angle échelle grating in white-pupil configuration, providing a spectral resolving power of R ~ 65,000 covering the spectral range between 450-800nm in one CCD exposure. A prism is used for cross-dispersion of échelle orders. The spectrum is focused by a commercial apochromat onto a 2k×2k CCD detector with 13.5μm per pixel. An exposure meter will be used to obtain precise photon-weighted midpoints of observations, which will be used in the computation of the barycentric corrections of measured radial velocities. A stabilized, newly designed iodine cell is employed for measuring radial velocities with high precision. Our goal is to reach a radial velocity precision of better than 5 m/s, providing an instrument with sufficient precision and sensitivity for the discovery of giant exoplanets. Here we describe the design of the Waltz spectrograph and early on-sky results.
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M. Tala , P. Heeren, M. Grill, R. J. Harris, J. Stürmer, C. Schwab, T. Gutcke, S. Reffert, A. Quirrenbach, W. Seifert, H. Mandel, L. Geuer, L. Schäffner, G. Thimm, U. Seeman, J. Tietz, K. Wagner, "A high-resolution spectrograph for the 72cm Waltz Telescope at Landessternwarte, Heidelberg", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99086O (9 August 2016); doi: 10.1117/12.2232730; https://doi.org/10.1117/12.2232730
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