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AI summary · arXiv: 2304.09215v1 · astro-ph.EP

Saturn's Interior After the Cassini Grand Finale

J. J. Fortney, B. Militzer, C. R. Mankovich, R. Helled, S. M. Wahl, N. Nettelmann, W. B. Hubbard, D. J. Stevenson,
and 3 more authorsL. Iess, M. S. Marley, N. Movshovitz
Original paper Submitted to arXiv on 18 Apr. 2023 Invited review. Accepted for publication in "Saturn: The Grand Finale", K. H. Baines et al., eds., Cambridge University Press. All-new follow-up to previous 2016 (pre-Grand Finale) review chapter here: arXiv:1609.06324 License: CC BY 4.0

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The essentials

  • Saturn's interior structure and thermal evolution have been extensively researched in recent years, particularly following the Cassini mission.
  • The Cassini mission provided data that allowed for a precise determination of Saturn's gravity field from the Grand Finale orbits.
  • Differential rotation, as seen in the visible atmosphere, extends down to at least a depth of 10,000 km (1/6th the planet's radius).
  • There is compelling evidence for a central heavy element concentration or "core" estimated to be between 12-20 Earth masses.
  • Recent models suggest that this core is not entirely compact but rather dilute and mixed with overlying H/He gas.
  • Ring seismology strongly suggests that there are waves propagating through Saturn’s rings which are linked to seismic modes within the planet itself.
  • A wide range of thermal evolution scenarios can match the planet’s current luminosity, with progress on better quantifying the helium rain scenario hampered by Saturn’s poorly known atmospheric helium abundance.
  • Heat generated by helium sinking towards the core plays an important role in determining Saturn’s thermal history.
  • Magnetic field data has also contributed significantly to our understanding of Saturn's interior structure.
  • Future work combining seismology and gravity within a framework that includes differential rotation will be essential for further progress in this area.
  • Further research is needed to refine our models and gain a better understanding of how internal structure dynamics and temperature are related on Saturn.
  • An entry probe into Saturn is highlighted as an important tool for future exploration efforts.

Key points written by AI: they may contain errors, check them against the paper.

AI-generated keywords: Saturn Interior Structure Thermal Evolution Cassini Mission Seismology

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Saturn's interior structure and thermal evolution have been the subject of extensive research in recent years, particularly following the Cassini mission. The mission provided data that allowed for a precise determination of Saturn's gravity field from the Grand Finale orbits, as well as ongoing identification of ring wave features in Saturn's C-ring tied to seismic modes in the planet. These advances have led to significant progress in our understanding of Saturn's structure. Models that match the gravity field suggest that differential rotation, as seen in the visible atmosphere, extends down to at least a depth of 10,000 km (1/6th the planet's radius). At greater depths, various investigations all now point to a deep Saturn rotation rate of 10 hours and 33 minutes. There is compelling evidence for a central heavy element concentration or "core" that is estimated to be between 12-20 Earth masses. Recent models suggest that this core is not entirely compact but rather dilute and mixed with overlying H/He gas. The core has a substantial radial extent, perhaps out to around one-half of the planet's radius. Ring seismology has also played an important role in understanding Saturn's interior structure. It strongly suggests that there are waves propagating through Saturn’s rings which are linked to seismic modes within the planet itself. This provides further evidence for a dilute core with an extended radial extent. A wide range of thermal evolution scenarios can match the planet’s current luminosity, with progress on better quantifying the helium rain scenario hampered by Saturn’s poorly known atmospheric helium abundance. However, it is clear that heat generated by helium sinking towards the core plays an important role in determining Saturn’s thermal history. Magnetic field data has also contributed significantly to our understanding of Saturn's interior structure. Future work combining seismology and gravity within a framework that includes differential rotation will be essential for further progress in this area. In conclusion, the Cassini mission has provided a wealth of data which has enabled significant advances in our knowledge about Saturn's interior structure and thermal evolution. Further research is needed to refine our models and gain a better understanding of how internal structure dynamics and temperature are related on Saturn. The utility of an entry probe into Saturn is also highlighted as an important tool for future exploration efforts.
Created on 23 Apr. 2023

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