M dwarfs radial velocities (Zechmeister+, 2009)

Details M dwarfs radial velocities (Zechmeister+, 2009) M dwarfs radial velocities (Zechmeister+, 2009)

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ycat..35050859z&link_type=abstract

VizieR On-line Data Catalog: J/A+A/505/859. Originally published in: 2009A&A...505..859Z

Other

Stars: M-Type, Stars: Dwarfs, Radial Velocities

Scientific paper

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.
(2 data files).

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