The solar gravitational redshift from HARPS-LFC Moon spectra

  title={The solar gravitational redshift from HARPS-LFC Moon spectra},
  author={Jonay I. Gonz{\'a}lez Hern{\'a}ndez and Rafael Rebolo and Luca Pasquini and G. Lo Curto and Paolo Molaro and E. Caffau and Hans-G. Ludwig and M. Steffen and Massimiliano Esposito and A. Su{\'a}rez Mascare{\~n}o and B. Toledo-Padr{\'o}n and Rafael A. Probst and Theodor W. H{\"a}nsch and Ronald Holzwarth and Antonio Manescau and Tilo Steinmetz and Thomas Udem and Tobias Wilken},
  journal={Astronomy and Astrophysics},
The General Theory of Relativity predicts the redshift of spectral lines in the solar photosphere, as a consequence of the gravitational potential of the Sun. This effect can be measured from a solar disk-integrated flux spectrum of the Sun's reflected light on solar system bodies. The laser frequency comb (LFC) calibration system attached to the HARPS spectrograph offers the possibility to perform an accurate measurement of the solar gravitational redshift (GRS) by observing the Moon or other… 

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