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The NASA-UC Eta-Earth Program: III. A Super-Earth orbiting HD 97658 and a Neptune-mass planet orbiting Gl 785

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 modelling 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 Msini = 8.2 +/- 1.2 M_Earth, orbital period P = 9.494 +/- 0.005 d, and an orbit that is consistent with circular. Gl 785 b is a Neptune-mass planet with Msini = 21.6 +/- 2.0 M_Earth, P = 74.39 +/- 0.12 d, and orbital eccentricity 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.

preprint2010arXivOpen access
Andrew W. HowardJohn Asher JohnsonGeoffrey W. MarcyDebra A. FischerJason T. WrightGregory W. HenryHoward IsaacsonJeff A. ValentiJay AndersonNikolai E. Piskunov
astro-ph.EP
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Andrew W. HowardJohn Asher JohnsonGeoffrey W. MarcyDebra A. FischerJason T. WrightGregory W. HenryHoward IsaacsonJeff A. ValentiJay AndersonNikolai E. Piskunov

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