J/other/Sci/330.653 Detected planets in the Eta-Earth Survey (Howard+, 2010)
The occurrence and mass distribution of close-in super-Earths, Neptunes, and
Jupiters.
Howard A.W., Marcy G.W., Johnson J.A., Fischer D.A., Wright J.T.,
Isaacson H., Valenti J.A., Anderson J., Lin D.N.C., Ida S.
<Science, 330, 653 (2010)>
=2010Sci...330..653H 2010Sci...330..653H
ADC_Keywords: Stars, double and multiple ; Planets ; Stars, masses
Abstract:
The questions of how planets form and how common Earth-like planets
are can be addressed by measuring the distribution of exoplanet masses
and orbital periods. We report the occurrence rate of close-in planets
(with orbital periods less than 50 days), based on precise Doppler
measurements of 166 Sun-like stars. We measured increasing planet
occurrence with decreasing planet mass (M). Extrapolation of a
power-law mass distribution fitted to our measurements,
df/dlogM=0.39M-0.48, predicts that 23% of stars harbor a close-in
Earth-mass planet (ranging from 0.5 to 2.0 Earth masses). Theoretical
models of planet formation predict a deficit of planets in the domain
from 5 to 30 Earth masses and with orbital periods less than 50 days.
This region of parameter space is in fact well populated, implying
that such models need substantial revision.
Description:
We measured at least 20 radial velocities (RVs) for each star,
achieving 1m/s precision with the HIRES echelle spectrometer at Keck
Observatory. To achieve sensitivity on time scales ranging from years
to days, the observations of each star were spread over 5 years, with
at least one cluster of 6 to 12 observations in a 12-night span.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tables1.dat 22 166 G and K-type target stars in the Eta-Earth Survey
tables2.dat 39 33 Detected planets in the Eta-Earth Survey
refs.dat 260 30 References
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Byte-by-byte Description of file: tables1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name
10 A1 --- m_Star Multiplicity index on Star
12- 13 A2 --- SpType MK spectral type
15- 18 F4.2 geoMass Mass Mass, in earth mass
20- 22 I3 --- Nobs Nunber of observations
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Byte-by-byte Description of file: tables2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Planet Planet name
13- 21 A9 --- Star Star name
23- 28 F6.1 d Per Period
30- 35 F6.1 Msun Msini M*sini value
38- 39 I2 --- Ref Reference, in refs.dat file
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 44 A21 --- Aut Author's name
45-260 A216 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Nov-2010