Volume 531, July 2011
|Number of page(s)||7|
|Section||Planets and planetary systems|
|Published online||21 June 2011|
Detection of Jovian seismic waves: a new probe of its interior structure
Institut d’Astrophysique Spatiale (UMR 8617), Faculté des Sciences d’Orsay,
Université Paris Sud,
2 Laboratoire Fizeau, Université de Nice, CNRS-Observatoire de la Côte d’Azur, 06108 Nice Cedex 2, France
3 Laboratoire Cassiopée, Université de Nice, CNRS-Observatoire de la Côte d’Azur, 06108 Nice Cedex 2, France
Received: 16 March 2011
Accepted: 6 June 2011
Knowledge of Jupiter’s deep interior would provide unique constraints on the formation of the Solar System. Measurement of its core mass and global composition would shed light on whether the planet formed by accretion or by direct gravitational collapse. At present, the inner structure of Jupiter is poorly constrained and seismology, which consists of identifying acoustic eigenmodes, offers a way to directly measure its deep sound speed profile, and thus its physical properties. Seismology of Jupiter has been considered since the mid 1970s, but hitherto the various attempts to detect global modes have led, at best, to ambiguous results. We report the detection of global modes of Jupiter, based on radial velocity measurements performed with the SYMPA Fourier spectro-imager. The global seismic parameters that we measure include the frequency of maximum amplitude 1213 ± 50 μHz, the mean large frequency spacing between radial harmonics 155.3 ± 2.2 μHz, and the mode maximum amplitude cm s-1, all values that are consistent with current models of Jupiter. This result opens the way to the investigation of the inner structure of the Solar System’s giant planets based on seismology techniques.
Key words: planets and satellites: individual: Jupiter / planets and satellites: interiors / waves / techniques: radial velocities / methods: data analysis / asteroseismology
© ESO, 2011
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