We calculate low-degree l acoustic (p-mode) oscillations of the giant planet Jupiter. We use two Jupiter models, both of which contain a rocky core, an ice mantle, and a hydrogen-rich envelope. One of the models incorporates the "plasma phase transition" (PPT) of hydrogen, a first-order phase transition that yields a density discontinuity in the hydrogen-rich envelope. Our calculations of the acoustic oscillation spectrum of Jupiter have taken account of the effects of the rapid rotation of the planet: the Coriolis force, centrifugal force, and deformation of the equilibrium state. The p-mode frequency spectra of the Jupiter models are summarized in several echelle diagrams. We show that the frequency spectra of the low-degree p-modes are strongly affected by the existence of the rocky core and by avoided crossings among high radial-order p-modes with different l's. Near the avoided crossings, these modes have mixed characteristics, simultaneously including features of p-modes with different l-values. We also discuss "discontinuity modes," which are produced by the density discontinuities between the rock core, ice mantle, and hydrogen-rich envelope. Low-degree discontinuity modes have frequencies lying between the radial fundamental and the radial first-overtone modes.
- Planets and satellites: individual (Jupiter)
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science