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Proceedings Paper

Design of a stable fixed delay interferometer prototype for the ET project
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Paper Abstract

The ET instrument being developed at Penn State is a novel approach that is capable of precision radial velocity measurements using a modest resolution. A prototype version of this instrument is now set up permanently at the Kitt Peak 2.1m telescope and has recovered the radial velocity curve of 51 Peg. The stability of the Michelson interferometer used in the setup is very crucial to obtain accurate velocity results. In this paper we discuss the issues associated with field widening and temperature compensation over a wide wavelength range and also describe the design of a prototype interferometer that meets these criteria. Our current prototype design built in the lab already outperforms our old interferometer over short time spans. A new interferometer based on the prototype will replace our current actively stabilized interferometer at Kitt Peak. The increased stability will enable us to start our planet search program in 2005, and to observe targets suitable for asteroseismology.

Paper Details

Date Published: 30 September 2004
PDF: 9 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.550447
Show Author Affiliations
Suvrath Mahadevan, The Pennsylvania State Univ. (United States)
Jian Ge, The Pennsylvania State Univ. (United States)
Curtis DeWitt, The Pennsylvania State Univ. (United States)
Julian C. van Eyken, The Pennsylvania State Univ. (United States)
Gerald Friedman, The Pennsylvania State Univ. (United States)

Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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