A Sub-Saturn Mass Planet Orbiting HD 3651

@article{Fischer2003ASM,
  title={A Sub-Saturn Mass Planet Orbiting HD 3651},
  author={Debra A. Fischer and R. Paul Butler and Geoffrey W. Marcy and Steven S. Vogt and Gregory W. Henry},
  journal={The Astrophysical Journal},
  year={2003},
  volume={590},
  pages={1081 - 1087}
}
We report precise Doppler velocities of HD 3651 obtained at Lick and Keck Observatories. The velocities reveal evidence of a planetary companion with an orbital period of 62.23 ± 0.03 days, an eccentricity of 0.63 ± 0.04, and a velocity semiamplitude of 15.9 ± 1.7 m s-1. With an assumed mass of 0.79 M☉ for this K0 V star, we derive M sin i = 0.20MJ and a semimajor axis of 0.284 AU. The star is chromospherically inactive, with log R = -5.01, and 10 years of observations at Fairborn Observatory… 

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References

SHOWING 1-10 OF 16 REFERENCES

A Pair of Resonant Planets Orbiting GJ 876

Precise Doppler measurements during 6 yr from the Lick and Keck observatories reveal two planets orbiting GJ 876 (M4V). The orbital fit yields companion masses of M sin i = 0.56 and 1.89 MJ, orbital

Seven New Keck Planets Orbiting G and K Dwarfs

Planetary mass companions orbiting seven nearby G and K dwarfs have been found from the Keck Precision Doppler Survey. A "51 Peg-like" planet orbiting HD 49674 has the smallest mass yet found, M sin

A Planet Orbiting the Star ρ Coronae Borealis

We report the discovery of near-sinusoidal radial velocity variations of the G0V star ρ CrB, with period 39.6 days and amplitude 67 m s-1. These variations are consistent with the existence of an

The CORALIE survey for southern extra-solar planets VII - Two short-period Saturnian companions to HD 108147 and HD 168746

Received 7 February 2002 / Accepted 19 March 2002 We present the discovery of two Saturn-mass companions to HD 108147 and HD 168746. Both belong to the lightest ever discovered planets. The minimum

Magnetic Activity-related Radial Velocity Variations in Cool Stars: First Results from the Lick Extrasolar Planet Survey

The discovery of the radial velocity (vr) signatures of planets around several solar-like stars highlights the importance of exploring the sources of vr variations intrinsic to the stars themselves.

ATTAINING DOPPLER PRECISION OF 3 M S-1

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

Rotation, convection, and magnetic activity in lower main-sequence stars

Rotation periods are reported for 14 main-sequence stars, bringing the total number of such stars with well-determined rotation periods to 41. It is found that the mean level of their Ca n H and K

Correcting Radial Velocities for Long-Term Magnetic Activity Variations

It is argued that the main cause of these effects is modification of the mean line bisector shape brought on by long-term, magnetic activity-induced changes in the surface brightness and convective patterns.

Techniques for Automated High‐Precision Photometry of Sun‐like Stars

Tennessee State University operates several Automatic Photoelectric Telescopes (APTs) located at Fairborn Observatory in the Patagonia Mountains of southern Arizona. The APTs are dedicated to

HIRES: the high-resolution echelle spectrometer on the Keck 10-m Telescope

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 echelle