New Attempt at Detecting the Jovian Oscillations

Abstract This paper reports seismic observations of Jupiter conducted in August 1996 with the Fourier Transform Spectrometer based at the CFH telescope, used as an accelerometer. With this instrument, the jovian velocity field was measured for the first time with an absolute velocity calibration. The noise in the Fourier spectrum reaches 4 cm s −1 μHz −1/2 . A dominating source of noise, identified as due to spurious velocity signals induced by the guiding errors on the rapid rotating planet, as well as a poor window function, has precluded the possible direct identification of jovian modes. However, there is strong evidence in the data for an oscillation characteristic frequency (or large splitting) ν 0 , at 142±3μHz, which confirms a low value of this parameter. Furthermore, the measurement of this parameter with a constant value in different frequency ranges along the whole Fourier spectrum seems to indicate a very small planetary core. The modes amplitude is inferred not to exceed 0.6 m s −1 in the 1- to 3.1-mHz frequency range.

[1]  T. Gudkova,et al.  THE FREE OSCILLATIONS OF JUPITER , 1999 .

[2]  T. Guillot.  A COMPARISON OF THE INTERIORS OF JUPITER AND SATURN , 1999, astro-ph/9907402.

[3]  T. Bedding,et al.  A search for solar‐like oscillations and granulation in α Cen A , 1998, astro-ph/9811299.

[4]  R. Garrido,et al.  The delta Scuti star FG Virginis. IV. Mode identifications and pulsation modelling , 1999 .

[5]  F. Bouchy,et al.  Possible Detection of p-mode Oscillations on Procyon , 1999 .

[6]  J. Bertaux,et al.  Solar-Like Oscillations of Procyon A: Stellar Models and Time Series Simulations versus Observations 1 , 1999 .

[7]  D. Mékarnia,et al.  New limit on the p-mode oscillations of Procyon obtained by Fourier transform seismometry , 1998 .

[8]  P. Lagage,et al.  3-D analysis of the seismic response of Jupiter to the SL9 impacts: application to the CAMIRAS infrared images , 1997 .

[9]  T. Guillot,et al.  New Constraints on the Composition of Jupiter from Galileo Measurements and Interior Models , 1997, astro-ph/9707210.

[10]  M. Sauvage,et al.  Impact Seismology: A Search for Primary Pressure Waves Following Impacts A and H , 1996 .

[11]  D. Hunten,et al.  A Search for Seismic Waves from the Impact of the SL/9 R Fragment , 1996 .

[12]  J. Maillard.  Seismology with a Fourier-transform spectrometer: applications to giant planets and stars. , 1996, Applied optics.

[13]  Timothy M. Brown,et al.  THE AFOE: A SPECTROGRAPH FOR PRECISION DOPPLER STUDIES , 1994 .

[14]  T. Guillot,et al.  Nonadiabatic Models of Jupiter and Saturn , 1994 .

[15]  T. Bedding,et al.  Solar-like oscillations in eta Boo , 1994, astro-ph/9411016.

[16]  B. Mosser,et al.  Excitation of Jovian Seismic Waves by the Shoemaker-Levy 9 Cometary Impact , 1994 .

[17]  B. Mosser,et al.  A New Asymptotic Formalism for Jovian Seismology , 1993 .

[18]  D. Mékarnia,et al.  Seismological observations with a Fourier transform spectrometer - Detection of Jovian oscillations , 1993 .

[19]  D. Saumon,et al.  The role of the molecular-metallic transition of hydrogen in the evolution of Jupiter, Saturn, and brown dwarfs , 1992 .

[20]  Umin Lee,et al.  Acoustic oscillations of Jupiter , 1992 .

[21]  F.-X. Schmider,et al.  Possible detection of Jovian global oscillations , 1991 .

[22]  B. Mosser.  The pressure mode oscillation spectrum of a rotating gaseous sphere: Application to Jupiter , 1990 .