We report the discovery of planets orbiting two bright, nearby early K dwarf stars, HD97658 and Gl785. These planets were detected by Keplerian modeling of radial velocities measured with Keck-HIRES for the NASA-UC Eta-Earth Survey. HD97658b is a close-in super-Earth with minimum mass Msin i = 8.2 ±1.2M ⊕, orbital period P = 9.494 ± 0.005days, and an orbit that is consistent with circular. Gl785b is a Neptune-mass planet with Msin i = 21.6 ± 2.0M ⊕, P = 74.39 ± 0.12days, and orbital eccentricity e = 0.30 ± 0.09. Photometric observations with the T12 0.8m automatic photometric telescope at Fairborn Observatory show that HD97658 is photometrically constant at the radial velocity period to 0.09mmag, supporting the existence of the planet.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science