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Published November 2015 | public
Journal Article Open

Attaining Doppler Precision of 10 cm s^(-1) with a Lock-in Amplified Spectrometer


We explore the radial velocity performance benefits of coupling starlight to a fast-scanning interferometer and a fast-readout spectrometer with zero readout noise. By rapidly scanning an interferometer, we can decouple wavelength calibration errors from precise radial velocity measurements, exploiting the advantages of lock-in amplification. In a Bayesian framework, we investigate the correlation between wavelength calibration errors and resulting radial velocity errors. We construct an end-to-end simulation of this approach to address the feasibility of achieving 10 cm s^(-1) radial velocity precision on a typical Sun-like star using existing, 5 m-class telescopes. We find that such a precision can be reached in a single night, opening up possibilities for ground-based detections of Earth-Sun analog systems.

Additional Information

© 2015 The Astronomical Society of the Pacific. Received 2014 February 11; accepted 2015 August 21; published 2015 October 21. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144469. P. S. M. acknowledges support for his work from the Hubble Fellowship Program, provided by NASA through Hubble Fellowship grant HST-HF-51326.01-A, awarded by the STScI, which is operated by the AURA, Inc., for NASA, under contract NAS 5-26555. P. S. M, G. V., and J. K. W. were supported by the Directors Research and Development Fund and the California Institute of Technology/Jet Propulsion Laboratory. M. B. is supported by a National Space Technology Research Fellowship. J. A. J. is supported by generous grants from the David and Lucile Packard Foundation and the Alfred P. Sloan Foundation. We would like to thank Lynne Hillenbrand for useful discussions. J. K. W. and G. V. are supported by the Caltech-JPL President and Director's fund.

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August 20, 2023
August 20, 2023