Feasibility of a search for planets around solar-type stars with a polarimetric radial velocity meter

Details Feasibility of a search for planets around solar-type stars with a polarimetric radial velocity meter Feasibility of a search for planets around solar-type stars with a polarimetric radial velocity meter

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976icar...27...13s&link_type=abstract

Icarus, vol. 27, Jan. 1976, p. 13-24. NSF-supported research.

Physics

12

Extrasolar Planets, Polarimetry, Radial Velocity, Stellar Motions, Stellar Spectra, Bandpass Filters, Calibrating, Fabry-Perot Spectrometers, Feasibility Analysis, Image Tubes, Polarized Light, Stellar Luminosity

Scientific paper

A method of wavelength calibration is proposed which may enable measuring changes in radial velocity of bright solar-type stars to an accuracy of about 5 meters per second. Such accuracy would be sufficient for detecting Jupiter-like planets around these stars. The stellar spectrum is imaged by a slitless echelle spectrograph onto a 100-channel Digicon image tube. Instrumental profiles of Digicon diodes are narrowed down by a Fabry-Perot etalon, making the profiles less dependent on atmospheric seeing. The spectrograph and the etalon act merely as a series of narrow band filters for the individual diodes; effective wavelengths of these 'filters' are monitored by a crystal retarder (phase retardation plate) kept at a constant temperature. For artificially linearly polarized stellar light which passes through this retarder and through a quarter-wave plate, the plane of polarization varies rapidly with wavelength. The precisely measured position angle of polarization provides wavelength calibration for every resolution element in the spectrum.

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