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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
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:

       FileName      Lrecl  Records   Explanations

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


Byte-by-byte Description of file: tables1.dat

   Bytes Format Units     Label     Explanations

   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


Byte-by-byte Description of file: tables2.dat

   Bytes Format Units   Label     Explanations

   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


Byte-by-byte Description of file: refs.dat

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     Ref       Reference number
   4- 22  A19   ---     BibCode   BibCode
  24- 44  A21   ---     Aut       Author's name
  45-260  A216  ---     Com       Comments


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    24-Nov-2010