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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
targets.dat 136 41 Targets
rv/* . 41 Individual RV and error bars
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Byte-by-byte Description of file: targets.dat
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Bytes Format Units Label Explanations
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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 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
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Note (1): From Hipparcos, van Leuuwen, 2007A&A...474..653V 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 2000A&A...364..217D)
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Byte-by-byte Description of file: rv/*
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Bytes Format Units Label Explanations
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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
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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.
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Acknowledgements:
Mathias Zechmeister, zechmeister(at)mpia.de
(End) Zechmeister [MPIA, Germany], Patricia Vannier [CDS] 14-Jul-2009