# A Planetary Companion to γ Cephei A

@article{Hatzes2003APC,
title={A Planetary Companion to $\gamma$ Cephei A},
author={A. P. Hatzes and William D. Cochran and Michael Endl and Barbara E. Mcarthur and Diane Beverly Paulson and Gordon Arthur Hunter Walker and Bruce Thomas Evison Campbell and Stephenson L. S. Yang},
journal={The Astrophysical Journal},
year={2003},
volume={599},
pages={1383-1394}
}
We report on the detection of a planetary companion in orbit around the primary star of the binary system γ Cephei. High-precision radial velocity measurements using four independent data sets spanning the time interval 1981-2002 reveal long-lived residual radial velocity variations superposed on the binary orbit that are coherent in phase and amplitude with a period or 2.48 yr (906 days) and a semiamplitude of 27.5 m s-1. We performed a careful analysis of our Ca II H and K S-index… Expand
220 Citations

#### Figures and Tables from this paper

The Planet Host Star γ Cephei: Physical Properties, the Binary Orbit, and the Mass of the Substellar Companion
The bright, K1 III-IV star γ Cep has been reported previously to have a possibly substellar companion in a ~2.5 yr orbit, as well as an unseen stellar companion at a larger separation. We determineExpand
The HARPS search for southern extra-solar planets. I. HD 330075 b: A new "hot Jupiter"
We report on the first extra-solar planet discovered with the brand new HARPS instrument. The planet is a typical "hot Jupiter" with m2 sini = 0.62 MJup and an orbital period of 3.39 days, but fromExpand
LONG-PERIOD VARIATIONS IN THE RADIAL VELOCITY OF SPECTROSCOPIC BINARY M GIANT μ URSAE MAJORIS
We report that the spectroscopic binary μ Ursae Majoris (μ UMa) has secondary RV variations of 471.2 days in addition to those of 230.0 days already known. Keplerian orbit analysis yields stellarExpand
Dynamical Stability and Habitability of the γ Cephei Binary-Planetary System
It has been suggested that the long-lived residual radial velocity variations observed in the precision radial velocity measurements of the primary of γ Cephei (HR 8974, HD 222404, HIP 116727) areExpand
The discovery of a planetary candidate around the evolved low-mass Kepler giant star HD 175370
We report on the discovery of a planetary companion candidate with a minimum mass M sin i = 4.6 +/- 1.0 M-Jupiter orbiting the K2 III giant star HD 175370 (KIC 007940959). This star was a target inExpand
A substellar component orbiting the F-star 30 Arietis B
• Physics
• 2009
Context. Most current radial velocity planet search programs have concentrated on stars of one solar mass. Our knowledge on the frequency of giant planets and brown dwarf companions to more massiveExpand
Precise radial velocities of giant stars: IX. HD 59686 Ab: a massive circumstellar planet orbiting a giant star in a ~13.6 au eccentric binary system
Context. For over 12 yr, we have carried out a precise radial velocity (RV) survey of a sample of 373 G- and K-giant stars using the Hamilton Echelle Spectrograph at the Lick Observatory. There are,Expand
A giant planet in the triple system HD 132563
As part of our radial velocity planet-search survey performed with SARG at TNG, we monitored the components of HD 132563 for ten years. It is a binary system formed by two rather similar solar typeExpand
Direct detection of exoplanet host star companion γ Cep B and revised masses for both stars and the sub-stellar object
• Physics
• 2007
Context. The star γ Cep is known as a single-lined spectroscopic triple system at a distance of 13.8 pc, composed of a K1 III-IV primary star with V = 3.2 mag, a stellar-mass companion in a 66-67Expand
Planetary systems in close binary stars: the case of HD 196885 - Combined astrometric and radial velocity study
• Physics
• 2011
Context. More than fifty candidate planets are presently known to orbit one component of a binary or a multiple star system. Planets can therefore form and survive in such an environment, althoughExpand

#### References

SHOWING 1-10 OF 40 REFERENCES
No planet for HD 166435
The G0 V star HD 166435 has been observed by the ber-fed spectrograph ELODIE as one of the targets in the large extra-solar planet survey that we are conducting at the Observatory of Haute-Provence.Expand
The Lack of Spectral Variability in 51 Pegasi: Confirmation of the Planet Hypothesis
• Physics
• 1998
We present-high resolution (R > 200,000), high signal-to-noise spectral data for 51 Pegasi spanning a complete orbital period of the purported planetary companion. A detailed examination of the lineExpand
Evidence for Multiple Companions to υ Andromedae
The bright F8 V star t Andromedae was previously reported to have a 4.6 day Doppler velocity periodicity, consistent with having a Jupiter-mass companion orbiting at 0.059 AU. Follow-up obser-Expand
A Search for Jupiter-Mass Companions to Nearby Stars
• Physics
• 1995
Abstract We have carefully monitored the radial velocities of 21 bright, solar-type stars for 12 years, None has shown any reflex motion due to a substellar companion to an upper limit of between 1Expand
On the Double-Planet System around HD 83443
The Geneva group has reported two Saturn-mass planets orbiting HD 83443 (K0 V) with periods of 2.98 and 29.8 days. The two planets have raised interest in their dynamics because of the possible 10 :Expand
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
Two New Planets from the Anglo-Australian Planet Search
• Physics
• 2001
Precise Doppler measurements from the Anglo-Australian Telescope (AAT) UCLES spectrometer reveal periodic Keplerian velocity variations in the stars HD 160691 and HD 27442. HD 160691 has a period ofExpand
Evidence of a sub-stellar companion around HD 47536
We report evidence of a low-mass companion around the K1III giant star HD 47536. This star belongs to our sample of 83 subgiant and giant stars studied for their radial velocity variations using theExpand
Planets in habitable zones: A study of the binary Gamma Cephei
• Physics
• 2003
The recently discovered planetary system in the binary y Cep was studied concerning its dynamical evolution. We confirm that the orbital parameters found by the observers are in a stableExpand
PRECISE DELTA-TEFF AND DELTA(R-I) FOR SOLAR-TYPE STARS
• Physics
• 1992
The uncertain physical origin of low-amplitude (30-300 m s-1) radial-velocity variations observed for solar-type stars in our precise radial-velocity program has led us to make substantial additionsExpand