A Planet Orbiting 47 Ursae Majoris

  title={A Planet Orbiting 47 Ursae Majoris},
  author={R. Paul Butler and Geoffrey W. Marcy},
  journal={The Astrophysical Journal},
The G0 V star 47 UMa exhibits very low amplitude radial velocity variations having a period of 2.98 yr, a velocity amplitude of K = 45.5 m s-1, and small eccentricity. The residuals scatter by 11 m s-1 from a Keplerian fit to the 34 velocity measurements obtained during 8 yr. The minimum mass of the unseen companion is M2 sin i = 2.39 MJ, and for likely orbital inclinations of 30?-90?, its mass is less than 4.8 MJ. This mass resides in a regime associated with extrasolar giant planets (Burrows… Expand
A Second Planet Orbiting 47 Ursae Majoris
Precise Doppler velocity measurements during 13 yr at Lick Observatory reveal the presence of two planets orbiting the star 47 UMa. The previously detected inner planet is confirmed by the newerExpand
A Planetary Companion to 70 Virginis
An extremely low mass companion to the solar-type star 70 Virginis is inferred from the observed periodic Doppler reflex motion of the primary during 8 yr. The minimum mass (M2 sin i) of 70 Vir "B"Expand
The Planet around 51 Pegasi
Doppler measurements of 51 Pegasi have been made from 1995 October through 1996 August, with a precision of 5 m s-1. We find a period of 4.231 days, a velocity amplitude of 56 ± 1 m s-1, and aExpand
The Discovery of a Planetary Companion to 16 Cygni B
High-precision radial-velocity observations of the solar-type star 16 Cygni B (HR 7504, HD 186427), taken at McDonald Observatory and at Lick Observatory, have each independently discovered periodicExpand
Two New Candidate Planets in Eccentric Orbits
Doppler measurements of two G-type main-sequence stars, HD 210277 and HD 168443, reveal Keplerian variations that imply the presence of companions with masses (M sin i) of 1.28 and 5.04 MJ (where MJExpand
Radial velocity variations have revealed planets orbiting 51 Peg, 47 UMa, and 70 Vir, and a low-mass companion orbiting HD 114762. We analyze parallel records of photometric measurements in StroŽExpand
Three New “51 Pegasi-Type” Planets*
We report Keplerian Doppler velocity variations, consistent with orbiting "51 Pegasi-type" planets, for the three stars HR 3522 (G8V), HR 5185 (F7V), and HR 458 (F8V). HR 3522 exhibits a velocityExpand
▪ Abstract Eight extrasolar planet candidates have now been identified, all revealed by Keplerian Doppler shifts in their host stars. The masses (m sin i) lie between 0.5 and 7 MJUP, and theExpand
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 anExpand
The ELODIE survey for northern extra-solar planets. III. Three planetary candidates detected with ELODIE
We present our ELODIE radial-velocity measurements of HD 74156 and 14 Her (HD 145675). These stars ex- hibit low-amplitude radial-velocity variations induced by the presence of low-mass companions.Expand


A Planetary Companion to 70 Virginis
An extremely low mass companion to the solar-type star 70 Virginis is inferred from the observed periodic Doppler reflex motion of the primary during 8 yr. The minimum mass (M2 sin i) of 70 Vir "B"Expand
A Search for Jupiter-Mass Companions to Nearby Stars
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
Giant planets at small orbital distances
Using Doppler spectroscopy to detect the reflex motion of the nearby star, 51 Pegasi, Mayor & Queloz (1995) claim to have discovered a giant planet in a 0.05 AU, 4.23 day orbit. They estimate itsExpand
The unseen companion of HD114762: a probable brown dwarf
BROWN dwarfs are substellar objects with too little mass to ignite hydrogen in their cores. Despite considerable effort to detect brown dwarfs astrometrically1–4, photometrically4–9, andExpand
Nebular gas drag and planetary accretion. II. Planet on an eccentric orbit.
Abstract We study the trajectories of planetesimals whose orbits decay starward as a result of gas drag and are perturbed by the gravity of a massive planet on an eccentric orbit. Each planetesimalExpand
Constraints on the Companion Object to HD 114762
High-precision radial velocity observations of the candidate planetary system HD 114762 are presented. The new data confirm Latham et al.'s discovery (1989, Nature, 339) of the binary nature of theExpand
A Theory of Extrasolar Giant Planets
We present a broad suite of models of extrasolar giant planets (EGP's), ranging in mass from 0.3 to 15 Jupiter masses. The models predict luminosity (both reflected and emitted) as a function of age,Expand
Proximity of Jupiter-Like Planets to Low-Mass Stars
  • A. Boss
  • Physics, Medicine
  • Science
  • 1995
The sensitivities of astrometric and radial velocity searches for extrasolar planets are strongly dependent on planetary masses and orbits, and radiative hydrodynamic models of protoplanetary disks around low-mass stars show that Jupiter-like planets should form at distances that are only weakly dependent on the stellar mass. Expand
The results of a recent study of coplanarity tendencies between stellar equatorial and binary orbital planes are applied to the low-metal F9V star HD 114762, for which a possible substellar companionExpand
A Jupiter-mass companion to a solar-type star
The presence of a Jupiter-mass companion to the star 51 Pegasi is inferred from observations of periodic variations in the star's radial velocity. The companion lies only about eight millionExpand