Attaining Doppler precision of 10 cm s(-1) with a lock-in amplified spectrometer
Johnson, John Asher
Muirhead, Philip S.
Wallace, J. Kent
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Citation (published version)Rebecca Jensen-Clem, Philip S. Muirhead, Michael Bottom, J. Kent Wallace, Gautam Vasisht, John Asher Johnson. 2015. "Attaining Doppler precision of 10 cm s(-1) with a lock-in amplified spectrometer." Publications of Astronomical Society of the Pacific, v. 127, issue 957, pp. 1105 - 1112 (8).
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.