A Search for Low Mass Companions around T Tauri stars

Details A Search for Low Mass Companions around T Tauri stars A Search for Low Mass Companions around T Tauri stars

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.6809h&link_type=abstract

American Astronomical Society Meeting 207, #68.09; Bulletin of the American Astronomical Society, Vol. 37, p.1267

Astronomy and Astrophysics

Astronomy

2

Scientific paper

High precision radial velocity surveys of main sequence stars have discovered numerous extra solar planets and a few brown dwarfs over the last decade. However, no such objects have yet been found around pre-main-sequences stars, limiting our information about when low-mass companions may form. We present early results of a new radial velocity survey of T Tauri stars using the coudé echelle spectrograph on the 2.7m telescope at McDonald Observatory. Wavelength calibration was performed using thorium-argon lamps taken just before and after each stellar observation. Radial velocity standards observed on each night show a scatter of about 100 m s-1. Three T-Tauri stars monitored on each night of our 2004 ten-day observing run show significantly stronger radial velocity variations (a standard deviation of ˜ 500 m s-1) than any of the radial velocity standards. Simultaneous photometric monitoring of the same stars reveal no obvious correlation with the radial velocity variability. In addition, we observed a few known high-amplitude extrasolar planetary systems. Our data are consistent with their published orbital parameters.

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