2010/11/01 by Andrew W. Howard, John Asher Johnson, Geoffrey W. Marcy +7 · 101 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy and Astrophysical Research #Eccentricity (behavior) #Exoplanet #Observatory #Orbit (dynamics) #Orbital eccentricity #Orbital elements #Orbital period #Planet #Radial velocity #Stellar, planetary, and galactic studies #astro-ph.EP
paper · pdf · doi:10.1088/0004-637x/730/1/10
published in The Astrophysical Journal 730(1), 10 (IOP Publishing) · Submitted to ApJ, 7 pages, 6 figures, 5 tables
arxiv created 2010/11/01 · openalex publication_date 2011/02/24 · arxiv updated 2015/05/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/08
We report the discovery of planets orbiting two bright, nearby early K dwarf stars, HD 97658 and Gl 785. These planets were detected by Keplerian modeling of radial velocities measured with Keck-HIRES for the NASA-UC Eta-Earth Survey. HD 97658 b is a close-in super-Earth with minimum mass M sin i = 8.2 ± 1.2 M ⊕ , orbital period P = 9.494 ± 0.005 days, and an orbit that is consistent with circular. Gl 785 b is a Neptune-mass planet with M sin i = 21.6 ± 2.0 M ⊕ , P = 74.39 ± 0.12 days, and orbital eccentricity e = 0.30 ± 0.09. Photometric observations with the T12 0.8 m automatic photometric telescope at Fairborn Observatory show that HD 97658 is photometrically constant at the radial velocity period to 0.09 mmag, supporting the existence of the planet.