The NASA-UC Eta-Earth program. III. A super-earth orbiting HD 97658 and a neptune-mass planet orbiting Gl 785

Andrew W. Howard, John Asher Johnson, Geoffrey W. Marcy, Debra A. Fischer, Jason T. Wright, Gregory W. Henry, Howard Isaacson, Jeff A. Valenti, Jay Anderson, Nikolai E. Piskunov

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number10
JournalAstrophysical Journal
Volume730
Issue number1
DOIs
StatePublished - Mar 20 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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