Color difference makes a difference: four planet candidates around tau Ceti

@article{Feng2017ColorDM,
title={Color difference makes a difference: four planet candidates around tau Ceti},
author={F. Feng and M. Tuomi and H. Jones and John Barnes and G. Anglada-Escud{\'e} and S. Vogt and R. Butler},
journal={arXiv: Earth and Planetary Astrophysics},
year={2017}
}

The removal of noise typically correlated in time and wavelength is one of the main challenges for using the radial velocity method to detect Earth analogues. We analyze radial velocity data of tau Ceti and find robust evidence for wavelength dependent noise. We find this noise can be modeled by a combination of moving average models and "differential radial velocities". We apply this noise model to various radial velocity data sets for tau Ceti, and find four periodic signals at 20.0, 49.3… CONTINUE READING