Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..604m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 2, p. 604-622.
Astronomy and Astrophysics
Astronomy
35
Absorption Spectra, Jupiter (Planet), Planetary Atmospheres, Pressure Oscillations, Astronomical Spectroscopy, Fourier Transformation, Seismology, Signal Processing, Jupiter, Seismology, Interferometry, Interior, Oscillations, Pressure, Techniques, Doppler Methods, Absorption, Atmosphere, Spectra, Analysis, Frequency, Comparisons, Velocity, Photons, Models, Water Vapor, Homogeneity, Stability, Procedure, Amplitude, Astronomy, Earth-Based Observations
Scientific paper
This paper describes a new method to search for giant-planet oscillations based on the detection of small Doppler shifts of tropospheric absorption lines. By using the multiplex properties of a Fourier Transform Spectrometer (FTS) the Doppler information in the whole bandpass of a planetary spectrum dominated by strong but non saturated atmospheric absorptions can be retrieved from the resulting amplitude modulation of the output signal recorded continuously at a fixed path difference. Hence, the Fourier transform of this signal will yield the frequency spectrum of the planetary oscillations. After presenting the principle of this interferometric method, the paper describes its application to Jupiter by observing the planet with the CFHT-FTS in the region of the 3 nu3 band of CH4 at 1.1 micron. The analysis of the recorded signal led to the positive detection of low-degree pressure oscillations through the identification of the l = 1 and l = 2 p-modes and a measure of their equidistance. The deduced value of the characteristic frequency of Jovian oscillations does not agree with theoretical determinations and calls for revision of the standard model of Jupiter's interior.
Delache Ph.
Gautier Daniel
Gay Jean
Maillard Jean Pierre
Mekarnia Djamel
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