The radial velocity search for extrasolar planets

Details The radial velocity search for extrasolar planets The radial velocity search for extrasolar planets

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988plas.rept...91m&link_type=abstract

In NASA, Washington, Reports of Planetary Astronomy, p 91-92 (SEE N89-16624 08-89)

Physics

Optics

Astronomical Spectroscopy, Fabry-Perot Spectrometers, Fiber Optics, Planets, Acceleration (Physics), Calibrating, Doppler Effect, Errors, Line Of Sight, Stars, Velocity

Scientific paper

Researchers are measuring small changes in the line-of-sight velocities of stars to detect the oscillating reflex acceleration induced by large planets. The intention is to observe enough stars for a long enough time to be able to make a statement of the probability of planets in a certain range of masses even if no planetary perturbations are detected. To make these measurements of Doppler shift with the required sensitivity, a new instrument was specifically designed, built and tested for this campaign of ground-based planet detection. The instrument is an optical spectrometer for which wavelengths are first calibrated by transmission through a tunable Fabry-Perot etalon interferometer. The intrinsic stability of the etalon and an image-scrambling fiber optic light feed provide great sensitivity to line-of-sight accelerations and immunity to systematic errors.

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