A High Resolution Spectrograph for the 72 cm Waltz Telescope at Landessternwarte, Heidelberg
M. Tala, P. Heeren, M. Grill, R. J. Harris, J. St\"urmer, C. Schwab,, T. Gutcke, S. Reffert, A. Quirrenbach, W. Seifert, H. Mandel, L. Geuer, L., Sch\"affner, G. Thimm, U. Seemann, J. Tietz, K. Wagner

TL;DR
The paper presents the design and initial on-sky results of the Waltz Spectrograph, a high-resolution instrument aimed at detecting exoplanets through precise radial velocity measurements with a 72 cm telescope.
Contribution
It introduces a novel high-resolution spectrograph optimized for exoplanet detection, featuring a specific optical design and stabilization techniques for high radial velocity precision.
Findings
Spectral resolving power of R~65,000 achieved
Radial velocity precision better than 5 m/s targeted
Initial on-sky tests demonstrate instrument capability
Abstract
The Waltz Spectrograph is a fiber-fed high-resolution \'echelle spectrograph for the 72 cm Waltz Telescope at the Landessternwarte, Heidelberg. It uses a 31.6 lines/mm 63.5 blaze angle \'echelle grating in white-pupil configuration, providing a spectral resolving power of 65,000 covering the spectral range between 450800\,nm in one CCD exposure. A prism is used for cross-dispersion of \'echelle orders. The spectrum is focused by a commercial apochromat onto a 2k2k CCD detector with 13.5m 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…
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