Updated Limits on Jovian Oscillations and Zonal Wind Measurements from PMODE

The Planetary Multi-level Oscillations and Dynamics Experiment (PMODE), a newly developed instrument, collected 24 nights of Doppler and polarimetric data on Jupiter from the AEOS 3.6m telescope in August 2020 in an effort to unambiguously identify the global oscillations of Jupiter. These oscillations, if detected, can be subsequently inverted to provide the first and only direct measurements of the deepest interior of Jupiter, providing the astronomical community with a direct opportunity to search for a solid core within the gaseous layers. Here, we present updated results from the PMODE observational campaign, including a 4.5 cm/s amplitude limit for the global modes of Jupiter. This limit suggests that deep silicate convective storms may not be viable as a mechanism for exciting the Jovian oscillations. Finally, we present an updated measurement of the Jovian zonal wind profile, which holds strong implications that the fundamental particle velocity likely matches the large-scale feature-tracking velocity. This set of novel observations and measurements hold potential to revolutionize the continued search for properties of the Jovian core.