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tokens: We are grateful to the staff astronomers at Keck Observatory for their assistance with the observations, and to Jason X. Prochaska, Tom Barlow, and Michael T. Murphy for providing some of the software that was used to reduce the data. We also thank an anonymous referee who provided helpful suggestions that improved the presentation of this work, following a referee who was unable to respond in a timely manner. During this work, R.J.C. was supported by a Royal Society University Research Fellowship. R.J.C. acknowledges support from STFC (ST/L00075X/1, ST/P000541/1). C.C.S. has been supported by grant AST-1313472 from the U.S. NSF. This research was also supported by a NASA Keck PI Data Award, administered by the NASA Exoplanet Science Institute. Data presented herein were obtained at the W. M. Keck Observatory from telescope time partially allocated to the National Aeronautics and Space Administration through the agency’s scientific partnership with the California Institute of Technology and the University of California. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. We thank the Hawaiian people for the opportunity to observe from MaunaKea; without their hospitality, this work would not have been possible. This work used the DiRAC Data Centric system at Durham University, operated by the Institute for Computational Cosmology on behalf of the STFC DiRAC HPC Facility ( http://www.dirac.ac.uk ). This equipment was funded by BIS National E-infrastructure capital grant ST/K00042X/1, STFC capital grant ST/H008519/1, and STFC DiRAC Operations grant ST/K003267/1 and Durham University. DiRAC is part of the National E-Infrastructure. This research has made use of NASA’s Astrophysics Data System. R.J.C. thanks S.O.C. for her impeccable timing and invaluable insight. Facility: Keck(HIRES) . Software: Astropy (Astropy Collaboration et al. 2013 ), Matplotlib (Hunter 2007 ), NumPy (van der Walt et al. 2011 ).