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J/A+A/505/859       M dwarfs radial velocities             (Zechmeister+, 2009)
The M dwarf planet search programme at the ESO VLT + UVES.
A search for terrestrial planets in the habitable zone of M dwarfs.
     Zechmeister M., Kuerster M., Endl M.
    <Astron. Astrophys. 505, 859 (2009)>
    =2009A&A...505..859Z
ADC_Keywords: Stars, M-type ; Stars, dwarfs ; Radial velocities

Keywords: stars: general - stars: planetary systems -
          techniques: radial velocities

Description:
    We present radial velocity (RV) measurements of our sample of 40 M
    dwarfs from our planet search programme with VLT+UVES begun in 2000.
    Although with our RV precision down to 2-2.5m/s and timebase line of
    up to 7 years we are capable of finding planets of few Earth masses in
    the close-in habitable zones of M dwarfs, there is no detection of a
    planetary companion. To demonstrate this we present mass detection
    limits allowing us to exclude Jupiter mass planets up to 1AU for most
    of our sample stars. We identified 6 M dwarfs that host a brown dwarf
    or low mass stellar companion. With the exception of these, all other
    sample stars show low RV variability with an rms <20m/s. Some high
    proper motion stars exhibit a linear RV trend consistent with their
    secular acceleration. Furthermore, we examine our data sets for a
    possible correlation between RVs and stellar activity as seen in
    variations of the Halpha line strength. For Barnard's star we found a
    significant anticorrelation, but most of the sample stars do not show
    such a correlation.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
targets.dat      136       41   Targets
rv/*              30       41   Individual RV and error bars


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

   Bytes Format Units     Label     Explanations

   1-  8  A8    ---       Name      Star name
   9- 16  A8    ---       OName     Other name
  18- 19  I2    ---       N         Number of measurements
  21- 24  I4    d         T         Time baseline
  26- 31  F6.1  m/s       sigma     Radial velocity scatter
  33- 36  F4.1  m/s       <sigma>   Mean radial velocity measurement error
  38- 46  A9    ---       Com       Comment
  48- 54  A7    ---       SpType    MK spectral type
  56- 60  F5.2  mag       Vmag      V magnitude
  62- 67  F6.2  pc        d         Heliocentric distance (1)
  69- 72  F4.2  solMass   Mass      Stellar mass (2)
  74- 81  F8.2  mas/yr    pmRA      Proper motion along RA
  83- 86  F4.2  mas/yr    e_pmRA    rms uncertainty on pmRA
  88- 95  F8.2  mas/yr    pmDE      Proper motion along DE
  97-100  F4.2  mas/yr    e_pmDE    rms uncertainty on pmDE
 102-107  F6.2  mas       plx       Parallax (1)
 109-112  F4.2  mas       e_plx     rms uncertainty on plx
 114-118  F5.3  m/s/yr    SA        Secular acceleration (d(RV(t))/dt)
 120-124  F5.3  m/s/yr    e_SA      rms uncertainty on SA
 126-136  A11   ---       FileName  Name of the file with radial velocity
                                     measurements in "rv" subdirectory

Note (1): From Hipparcos, van Leuuwen, 2007A&A...474..653V, Cat. I/311

Note (2): Stellar mass derived from the K-band mass-luminosity relation by
           Delfosse (2000A&A...364..217D)


Byte-by-byte Description of file: rv/*

   Bytes Format Units   Label     Explanations

   1- 14  F14.6 d       BJD       Barycentric Julian date
  16- 23  F8.2  m/s     RV        Differential radial velocity (1)
  25- 30  F6.2  m/s     e_RV      Uncertainty on RV

Note (1): RV is not corrected for the secular acceleration. See the paper
     or the summary table (targets.dat) for the correction values derived
     from Hipparcos parallax and proper motion.


Acknowledgements:
    Mathias Zechmeister, zechmeister(at)mpia.de
(End)          Zechmeister [MPIA, Germany], Patricia Vannier [CDS]   14-Jul-2009