A Decade of Radial-velocity Monitoring of Vega and New Limits on the Presence of Planets

  title={A Decade of Radial-velocity Monitoring of Vega and New Limits on the Presence of Planets},
  author={Spencer A. Hurt and Samuel N. Quinn and David W. Latham and Andrew M. Vanderburg and Gilbert A. Esquerdo and M. Calkins and Perry L. Berlind and Ruth Angus and Christian A. Latham and George Zhou},
  journal={The Astronomical Journal},
We present an analysis of 1524 spectra of Vega spanning 10 yr, in which we search for periodic radial-velocity variations. A signal with a periodicity of 0.676 day and a semi-amplitude of ∼10 m s−1 is consistent with the rotation period measured over much shorter time spans by previous spectroscopic and spectropolarimetric studies, confirming the presence of surface features on this A0 star. The activity signal appears to evolve on long timescales, which may indicate the presence of failed… 
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