Physics – Optics
Scientific paper
Jun 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apopt..35.2734m&link_type=abstract
Applied Optics, Volume 35, Issue 16, June 1, 1996, pp.2734-2746
Physics
Optics
9
Astronomical Optics, Instrumentation: Measurement: And Metrology, Interferometry, Spectroscopy, Spectroscopy: Fourier Transforms
Scientific paper
A method to detect the acoustic oscillation spectrum of giant planets and stars exploits the multiplex properties of a Fourier-transform spectrometer (FTS). It is based on measurement of the small Doppler shift related to the oscillation of the atmosphere measured from all the lines in a portion of the planetary or the stellar spectrum directly from the interferogram. The resulting amplitude modulation of the output signal is recorded continuously over several consecutive nights at a fixed path difference selected from criteria of optimum efficiency. Hence the Fourier transform of this signal yields the pressure-mode spectrum of the object. Applications to Jupiter, Saturn, and Procyon, observed in this mode with the step-scan FTS installed in the Canada-France-Hawaii Telescope, are presented. Future projects are discussed. seismology, planetary atmospheres.
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