We describe the high resolution echelle spectrometer (HIRES) now in operation on the
Keck Telescope. HIRES, which is permanently located at a Nasmyth focus, is a standard in-plane …

Doppler measurements from Keck exhibit a sinusoidal periodicity in the velocities of the G0
dwarf HD 209458, having a semiamplitude of 81 ms-1 and a period of 3.5239 days, which is …

We report Doppler measurements for six nearby G-and K-type main-sequence stars that show
multiple low-mass companions, at least one of which has planetary mass. One system has …

The paper presents an improved version of the Doppler imaging technique, which now uses
the principles of maximum entropy image reconstruction to derive spatially resolved images …

We discuss a technique for imaging the surfaces of certain rapidly rotating spotted stars.
The method exploits the correspondence between wavelength position across a rotationally …

The Hamilton Echelle Spectrometer, installed at the coudé focus of the Shane 3-m telescope,
is a high-dispersion spectrograph optimized for use with today’s largest available CCDs, …

We present precision radial velocity data that reveal a multiple exoplanet system orbiting
the bright nearby G5V star 61 Virginis. Our 4.6 years of combined Keck/HIRES and Anglo-…

We present 11 years of HIRES precision radial velocities (RVs) of the nearby M3V star Gliese
581, combining our data set of 122 precision RVs with an existing published 4.3-year set of …

Current spectroscopic techniques yield Doppler-shift errors of 10 to 50 ms-1, barely adequate
to detect reflex velocities caused by Jupiter-like and lower-mass planets. We describe a …

We analyze 8 years of precise radial velocity measurements from the Keck Planet Search,
characterizing the detection threshold, selection effects, and completeness of the survey. We …