A Neptune-Mass Planet Orbiting the Nearby G Dwarf Hd 16417

O'Toole, S. J.; Tinney, C. G.; Butler, R. Paul; Jones, H. R. A.; Bailey, Jeremy; Carter, Brad; Vogt, Steven S.; Laughlin, Gregory; Rivera, Eugenio J.

doi:10.1088/0004-637x/697/2/1263

Cited by 48 publications

(25 citation statements)

References 49 publications

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“…10 http://exoplanets.org with a 24% upper limit (95% confidence). This is consistent with results from the Anglo-Australian Telescope (O'Toole et al 2009)-two detected planets in the mass range M sin i = 5-30 M ⊕ with P < 16 days orbiting 24 FGK dwarfs. The initial estimate of an occurrence rate of 30% ± 10% for M sin i = 3-30 M ⊕ and P < 50 days based on measurements with HARPS (Mayor et al 2009) is consistent with a close-in planet mass function that rises steeply with decreasing planet mass, but is inconsistent with the H10 occurrence measurement.…”

Section: Introductionsupporting

confidence: 91%

THE NASA-UC ETA-EARTH PROGRAM. III. A SUPER-EARTH ORBITING HD 97658 AND A NEPTUNE-MASS PLANET ORBITING Gl 785

Howard

Johnson

Marcy

et al. 2011

ApJ

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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 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 ⊕ , orbital period P = 9.494 ± 0.005 days, and an orbit that is consistent with circular. Gl 785 b is a Neptune-mass planet with M sin i = 21.6 ± 2.0 M ⊕ , 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.

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Section: Introductionsupporting

confidence: 91%

THE NASA-UC ETA-EARTH PROGRAM. III. A SUPER-EARTH ORBITING HD 97658 AND A NEPTUNE-MASS PLANET ORBITING Gl 785

Howard

Johnson

Marcy

et al. 2011

ApJ

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“…It is critical to control the observing window in this manner in order to detect or exclude low-amplitude signals (Tinney et al 2011). This was demonstrated by our detection of the 17 Earth-mass planet HD 16417b (O'Toole et al 2009a). The discovery was made possible by the "Rocky Planet Search" strategy which employed continuous 48-night observing blocks.…”

Section: Significance and Innovationmentioning

confidence: 98%

A Campaign for the Detection of Earth-Mass Planets in the Habitable Zone of Alpha Centauri

Wittenmyer

Endl²,

Bergmann

et al. 2012

Proc. IAU

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Abstract.We review the possible formation and orbital stability of Earth-mass or super Earthmass planets around either of the stars Alpha Centauri A or B and describe a program at Mt John University Observatory using the Doppler method that aims to detect such planets. From New Zealand, we are able to observe the Alpha Centauri system year-round. This is critical in order to acquire data of sufficient quantity and phase coverage to detect the orbit of a terrestrial-mass planet in the habitable zone. Our observations are being made at high resolution (R = 70, 000) and high signal-to-noise with the Hercules vacuum echelle spectrograph attached to the 1-m McLellan telescope by a 25-m long optical fibre and using an iodine cell. We discuss the velocity precision and instrumental stability required for success and outline the progress of the observations so far. At present we are collecting about 10,000 observations of each star, A and B, per year with a typical precision of 2.5 m/s per observation.

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“…The power of this intensive observing approach is most simply and dramatically demonstrated by our detection of the shortperiod planet HD 16417b (O'Toole et al 2009a) from 24 epochs obtained on that run, and the non-detection of the same planet in a similar quantity of similar quality data spread over a 2 yr period. This bears out the simulations performed by other investigators-that to detect planets with amplitudes of 1-3 times that of the net measurement uncertainty, it is necessary to acquire observations over many contiguous periods (see, for example, Narayan et al 2005).…”

Section: The Anglo-australian Rocky Planet Searchmentioning

confidence: 99%

“…It is presented in a separate paper (O'Toole et al 2009a) to which we refer the reader for further details.…”

Section: Planets In the Samplementioning

confidence: 99%

The Frequency of Low-Mass Exoplanets

O'Toole

Jones

Tinney³

et al. 2009

ApJ

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We report first results from the Anglo-Australian Telescope Rocky Planet Search-an intensive, high-precision Doppler planet search targeting low-mass exoplanets in contiguous 48 night observing blocks. On this run, we targeted 24 bright, nearby and intrinsically stable Sun-like stars selected from the Anglo-Australian Planet Search's main sample. These observations have already detected one low-mass planet reported elsewhere (HD 16417b), and here we reconfirm the detection of HD 4308b. Further, we have Monte Carlo simulated data from this run on a star-by-star basis to produce robust detection constraints. These simulations demonstrate clear differences in the exoplanet detectability functions from star to star due to differences in sampling, data quality and intrinsic stellar stability. They reinforce the importance of star-by-star simulation when interpreting the data from Doppler planet searches. These simulations indicate that for some of our target stars we are sensitive to close-orbiting planets as small as a few Earth masses. The two low-mass planets present in our 24-star sample indicate that the exoplanet minimum mass function at low masses is likely to be a flat α ∼ −1 (for dN/dM ∝ M α ) and that between 15%±10% (at α = −0.3) and 48% ± 34% (at α = −1.3) of stars host planets with orbital periods of less than 16 days and minimum masses greater than 3 M ⊕ .

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A Neptune-Mass Planet Orbiting the Nearby G Dwarf Hd 16417

Cited by 48 publications

References 49 publications

THE NASA-UC ETA-EARTH PROGRAM. III. A SUPER-EARTH ORBITING HD 97658 AND A NEPTUNE-MASS PLANET ORBITING Gl 785

THE NASA-UC ETA-EARTH PROGRAM. III. A SUPER-EARTH ORBITING HD 97658 AND A NEPTUNE-MASS PLANET ORBITING Gl 785

A Campaign for the Detection of Earth-Mass Planets in the Habitable Zone of Alpha Centauri

The Frequency of Low-Mass Exoplanets

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