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Vitality of Gorse-seed
Authors
Ryan T. Blackman
John M. Brewer
+26 more
Lars A. Buchhave
Samuel H. C. Cabot
Allen B. Davis
Debra A. Fischer
Paul Fournier
Matteo Genoni
Ronald Holzwarth
Colby A. Jurgenson
Christopher Leet
Joe Llama
Tyler M. McCracken
Bijan Nemati
J. M. Joel Ong
Giorgio Pariani
Rafal Pawluczyk
Ryan R. Petersburg
Rafael A. Probst
Marco Riva
David Sawyer
Travis Sawyer
Michael Shao
Tilo Steinmetz
Andrew E. Szymkowiak
Russell Trahan
René Tronsgaard
Lily L. Zhao
Publication date
1 January 2008
Publisher
Springer Nature
Doi
Cite
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on
arXiv
Abstract
The EXtreme PREcision Spectrograph (EXPRES) is a new Doppler spectrograph designed to reach a radial-velocity measurement precision sufficient to detect Earth-like exoplanets orbiting nearby, bright stars. We report on extensive laboratory testing and on-sky observations to quantitatively assess the instrumental radial-velocity measurement precision of EXPRES, with a focused discussion of individual terms in the instrument error budget. We find that EXPRES can reach a single-measurement instrument calibration precision better than 10 cm s-1, not including photon noise from stellar observations. We also report on the performance of the various environmental, mechanical, and optical subsystems of EXPRES, assessing any contributions to radial-velocity error. For atmospheric and telescope related effects, this includes the fast tip-tilt guiding system, atmospheric dispersion compensation, and the chromatic exposure meter. For instrument calibration, this includes the laser fRequency comb (LFC), flat-field light source, CCD detector, and effects in the optical fibers. Modal noise is mitigated to a negligible level via a chaotic fiber agitator, which is especially important for wavelength calibration with the LFC. Regarding detector effects, we empirically assess the impact on the radial-velocity precision due to pixel-position nonuniformities and charge transfer inefficiency (CTI). EXPRES has begun its science survey to discover exoplanets orbiting G-dwarf and K-dwarf stars, in addition to transit spectroscopy and measurements of the Rossiter-McLaughlin effect. © 2020. The American Astronomical Society. All rights reserved.Immediate accessThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at
[email protected]
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