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THE NASA-UC ETA-EARTH PROGRAM. III. A SUPER-EARTH ORBITING HD 97658 AND A NEPTUNE-MASS PLANET ORBITING G1 785
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2011 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 730, no 1, 10- p.Article in journal (Refereed) Published
Abstract [en]

We report the discovery of planets orbiting two bright, nearby early K dwarf stars, HD 97658 and G1 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-circle plus, orbital period P = 9.494 +/- 0.005 days, and an orbit that is consistent with circular. G1 785 b is a Neptune-mass planet with M sin i = 21.6 +/- 2.0 M-circle plus, 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.

Place, publisher, year, edition, pages
2011. Vol. 730, no 1, 10- p.
Keyword [en]
planetary systems, stars: individual (HD 97658, G1 785), techniques: radial velocities
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-151905DOI: 10.1088/0004-637X/730/1/10ISI: 000288453600010OAI: oai:DiVA.org:uu-151905DiVA: diva2:411627
Available from: 2011-04-19 Created: 2011-04-19 Last updated: 2017-12-11Bibliographically approved

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Piskunov, Nikolai

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