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Ultra-high-precision velocity measurements of oscillations in alpha Cen A
R. Paul Butler, Timothy R. Bedding, Hans Kjeldsen +5
We have made differential radial velocity measurements of the star alpha Cen A using two spectrographs, UVES and UCLES, both with iodine absorption cells for wavelength referencing…
A Planet in a Circular Orbit with a 6 Year Period
Brad D. Carter, R. Paul Butler, C. G. Tinney +5
Precision Doppler velocity measurements from the 3.9--m Anglo-Australian Telescope reveal a planet with a 6 year period orbiting the G5 dwarf HD 70642. The a = 3.3 AU orbit has a l…
Infrared Parallaxes for Methane T dwarfs
C. G. Tinney, Adam J. Burgasser, J. Davy. Kirkpatrick
We report final results from our 2.5 year infrared parallax program carried out with the European Southern Observatory 3.5m New Technology Telescope and the SOFI infrared camera. O…
Time resolved spectroscopy of the variable brown dwarf Kelu-1
F. J. Clarke, C. G. Tinney, S. T. Hodgkin
We report the results of observations designed to investigate the spectroscopic signatures of dust clouds on the L2 brown dwarf Kelu-1. Time resolved medium resolution spectra show…