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Proceedings Paper

A high-resolution spectrograph for the 72cm Waltz Telescope at Landessternwarte, Heidelberg
Author(s): 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
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Paper 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.

Paper Details

Date Published: 9 August 2016
PDF: 7 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99086O (9 August 2016); doi: 10.1117/12.2232730
Show Author Affiliations
M. Tala , Landessternwarte Heidelberg (Germany)
P. Heeren, Landessternwarte Heidelberg (Germany)
M. Grill, Landessternwarte Heidelberg (Germany)
R. J. Harris, Landessternwarte Heidelberg (Germany)
J. Stürmer, The Univ. of Chicago (United States)
C. Schwab, Macquarie Univ. (Australia)
T. Gutcke, Max-Planck-Institut für Astronomie (Germany)
S. Reffert, Landessternwarte Heidelberg (Germany)
A. Quirrenbach, Landessternwarte Heidelberg (Germany)
W. Seifert, Landessternwarte Heidelberg (Germany)
H. Mandel, Landessternwarte Heidelberg (Germany)
L. Geuer, Landessternwarte Heidelberg (Germany)
L. Schäffner, Landessternwarte Heidelberg (Germany)
G. Thimm, Astronomisches Rechen-Institut, Univ. Heidelberg (Germany)
U. Seeman, Institut für Astrophysik Göttingen (Germany)
J. Tietz, Landessternwarte Heidelberg (Germany)
K. Wagner, Landessternwarte Heidelberg (Germany)

Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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