Two Exoplanets Discovered at Keck Observatory
arXiv:0908.1612 · doi:10.1088/0004-637X/702/2/989
Abstract
We present two exoplanets detected at Keck Observatory. HD 179079 is a G5 subgiant that hosts a hot Neptune planet with Msini = 27.5 M_earth in a 14.48 d, low-eccentricity orbit. The stellar reflex velocity induced by this planet has a semiamplitude of K = 6.6 m/s. HD 73534 is a G5 subgiant with a Jupiter-like planet of Msini = 1.1 M_jup and K = 16 m/s in a nearly circular 4.85 yr orbit. Both stars are chromospherically inactive and metal-rich. We discuss a known, classical bias in measuring eccentricities for orbits with velocity semiamplitudes, K, comparable to the radial velocity uncertainties. For exoplanets with periods longer than 10 days, the observed exoplanet eccentricity distribution is nearly flat for large amplitude systems (K > 80 m/s), but rises linearly toward low eccentricity for lower amplitude systems (K > 20 m/s).
8 figures, 6 tables, accepted, ApJ
References in corpus (8)
- Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
- Toward a Deterministic Model of Planetary Formation V. Accumulation Near the Ice Line
- Efficient fitting of multiplanet Keplerian models to radial velocity and astrometry data
- HD147506b: A Super-Massive Planet in an Eccentric Orbit Transiting a Bright Star
- XO-3b: A Massive Planet in an Eccentric Orbit Transiting an F5V Star
- On the Eccentricity Distribution of Exoplanets from Radial Velocity Surveys
- An Eccentric Hot Jupiter Orbiting the Subgiant HD 185269
- The Jupiter Twin HD 154345b
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- Retired A Stars and Their Companions. III. Comparing the Mass-Period Distributions of Planets Around A-Type Stars and Sun-Like Stars
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- Retired A Stars and Their Companions VI. A Pair of Interacting Exoplanet Pairs Around the Subgiants 24 Sextanis and HD200964
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- The NASA-UC Eta-Earth Program: II. A Planet Orbiting HD 156668 with a Minimum Mass of Four Earth Masses
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- The Physical Parameters of the Retired A Star HD185351
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- Retired A Stars and Their Companions VIII: 15 New Planetary Signals Around Subgiants and Transit Parameters for California Planet Search Planets with Subgiant Hosts
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- M2K: II. A Triple-Planet System Orbiting HIP 57274
- The GAPS Programme with HARPS-N at TNG XVII. Line profile indicators and kernel regression as diagnostics of radial-velocity variations due to stellar activity in solar-like stars
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- Ariel stellar characterisation: I -- homogeneous stellar parameters of 187 FGK planet host stars Description and validation of the method
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- Revised Orbit and Transit Exclusion for HD 114762b
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- A Comprehensive Characterization of the 70 Virginis Planetary System
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- Stellar Parameters for HD 69830, a Nearby Star with Three Neptune Mass Planets and an Asteroid Belt
- A New Analysis of the Exoplanet Hosting System HD 6434
- Exoplanets Around Red Giants: Distribution and Habitability
- Orbital Refinement and Stellar Properties for the HD 9446, HD 43691, and HD 179079 Planetary Systems