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20 July 2010 Precise infrared radial velocimetry with the Triplespec Exoplanet Discovery Instrument: current performance and results
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Abstract
The TripleSpec Exoplanet Discovery Instrument (TEDI) is optimized to detect extrasolar planets orbiting midto- late M dwarfs using the Doppler technique at infrared wavelengths. TEDI is the combination of a Michelson interferometer and a moderate-resolution near-infrared spectrograph, TripleSpec, mounted on the Cassegrain focus of the Palomar 200-inch Hale Telescope. Here we present results from observations of a radial velocity standard star and a laboratory source over the past year. Our results indicate that focus effects within the interferometer, combined with non-common-path errors between the ThAr calibration source and starlight, limit our performance to several 100 m/s. An upgraded version of TEDI, TEDI 2.0, will eliminate this behavior by mixing ThAr with starlight in a scrambled fiber before a redesigned interferometer with minimal focal effects.
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Philip S. Muirhead, Jerry Edelstein, Jason T. Wright, David J. Erskine, Matthew W. Muterspaugh, Kevin R. Covey, Mario R. Marckwordt, Samuel Halverson, Daniel Mondo, and James P. Lloyd "Precise infrared radial velocimetry with the Triplespec Exoplanet Discovery Instrument: current performance and results", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77357X (20 July 2010); doi: 10.1117/12.857196; https://doi.org/10.1117/12.857196
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