Precise radial velocities of giant stars. II. Pollux and its planetary companion

@article{Reffert2006PreciseRV,
title={Precise radial velocities of giant stars. II. Pollux and its planetary companion},
author={Sabine Reffert and Andreas Quirrenbach and David S. Mitchell and Simon H. Albrecht and Saskia Hekker and Debra A. Fischer and Geoffrey W. Marcy and R. Paul Butler},
journal={The Astrophysical Journal},
year={2006},
volume={652},
pages={661-665}
}
It has long been speculated that the observed periodic radial velocity pattern for the K giant Pollux might be explained in terms of an orbiting planetary companion. We have collected 80 high-resolution spectra for Pollux at Lick Observatory yielding precise radial velocities with a mean error of 3.8 m s-1, providing the most comprehensive and precise data set available for this star. Our data confirm the periodicity previously seen in the radial velocities. We derive a period of 589.7 ± 3.5… Expand

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References

SHOWING 1-10 OF 23 REFERENCES
Precise radial velocities of giant stars I. Stable stars
Context. Future astrometric missions such as SIM PlanetQuest need very stable reference stars. K giants have large luminosities, which place them at large distances and thus the jitter of theirExpand
LIMITS ON LINE BISECTOR VARIABILITY FOR STARS WITH EXTRASOLAR PLANETS
We present an analysis of high-resolution synoptic spectra of ten F- and G-type stars, seven of which exhibit periodic radial velocity variations due to the presence of one or more substellarExpand
Discovery of a Substellar Companion to the K2 III Giant ι Draconis
• Physics
• 2002
We report precise radial velocity measurements of the K giant ι Dra (HD 137759, HR 5744, HIP 75458), carried out at Lick Observatory, which reveal the presence of a substellar companion orbiting theExpand
Confirmation of the planet hypothesis for the long-period radial velocity variations of β Geminorum
Aims. Our aim is to confirm the nature of the long period radial velocity measurements for β Gem first found by Hatzes & Cochran (1993). Methods. We present precise stellar radial velocityExpand
A Strategy for Identifying the Grid Stars for the Space Interferometry Mission
• Physics
• 2001
We present a strategy to identify several thousand stars that are astrometrically stable at the microarcsecond level for use in the Space Interferometry Mission (SIM) astrometric grid. TheExpand
Long-Period Radial Velocity Variations in Three K Giants
• Physics
• 1993
Precise relative radial velocities (σ∼20 m s −1 ) are presented for three K giants: α Tau, α Boo, and β Gem. The data reveal periods of 233 days for α Boo, 643 days for α Tau, and 558 days for β Gem.Expand
A low-amplitude periodicity in the radial velocity and chromospheric emission of beta Geminorum
Using high-quality spectra obtained with the hydrogren fluoride technique at the Canada-France-Hawaii 3.6-meter telescope and Dominion Astrophysical Observatory 1.22-meter telescope, we have detectedExpand
Discovery of solar-like oscillations in the red giant $\varepsilon$ Ophiuchi
We present the discovery of solar-like oscillations in time-series of the G9.5 red giant \varepsilon Ophiuchi. The data were obtained with the CORALIE spectrograph at the 1.2 m Swiss telescope in LaExpand
Yellow giants - A new class of radial velocity variable
• Physics
• 1989
The five K giants and one K supergiant included in a precise (HF) radial velocity program all show significant long-term (about 1 yr), low-amplitude (30-300 m/s rms) radial velocity variations whichExpand
Detection of Solar-like Oscillations in the G7 Giant Star xi Hya
We report the firm discovery of solar-like oscillations in a giant star. We monitored the star ξ Hya (G7III) continu- ously during one month with the CORALIE spectrograph attached to the 1.2 m SwissExpand