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

doi:10.1088/0004-637X/730/1/10

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

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55 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 language	English (US)
Article number	10
Journal	Astrophysical Journal
Volume	730
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/730/1/10
State	Published - Mar 20 2011

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/730/1/10

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

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.",

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

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doi = "10.1088/0004-637X/730/1/10",

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AU - Johnson, John Asher

AU - Marcy, Geoffrey W.

AU - Fischer, Debra A.

AU - Wright, Jason T.

AU - Henry, Gregory W.

AU - Isaacson, Howard

AU - Valenti, Jeff A.

AU - Anderson, Jay

AU - Piskunov, Nikolai E.

PY - 2011/3/20

Y1 - 2011/3/20

N2 - 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.

AB - 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.

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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

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