2007/08/06 by Sarah E. Robinson, Gregory Laughlin, Steven S. Vogt +7 · 1 citation
Physics and Astronomy · #Astro and Planetary Science #Astronomy and Astrophysical Research #Circular orbit #Eccentricity (behavior) #Orbit (dynamics) #Orbital eccentricity #Orbital elements #Planet #Planetary system #Radial velocity #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/522106
32 pages, including 11 figures and 5 tables. Accepted by ApJ
arxiv created 2007/08/06 · openalex publication_date 2007/12/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report the discovery of two new planets: a 1.94 M Jup planet in a 1.8 yr orbit of HD 5319, and a 2.51 M Jup planet in a 1.1 yr orbit of HD 75898. The measured eccentricities are 0.12 for HD 5319b and 0.10 for HD 75898b, and Markov chain Monte Carlo simulations based on the derived orbital parameters indicate that the radial velocities of both stars are consistent with circular planet orbits. With low eccentricity and 1 AU < a < 2 AU, our new planets have orbits similar to terrestrial planets in the solar system. The radial velocity residuals of both stars have significant trends, likely arising from substellar or low-mass stellar companions.