[S19-1] Giant planet and remote sensing seismology, Europa and ocean-world seismology

[S19-1-02] Probing the interior of Jupiter toward unveiling its formation: A new attempt with Jovian seismology

^○Masahiro Ikoma¹, Bun'ei Sato², Takashi Sekii³, Hidekazu Hanayama⁴, Shigeru Ida² (1.The University of Tokyo, Tokyo, Japan, 2.Tokyo Institute of Technology, Tokyo, Japan, 3.National Astronomical Observatory of Japan, Tokyo, Japan, 4.Ishigakijima Astronomical Observatory, Okinawa, Japan)

The formation of Jupiter remains less well understood. Planet formation theories suggest that heavy element distribution in the Jupiter's deep interior, in particular, the size of the dense core, provides an important clue to understanding. The conventional method based on the measured gravitational moments, however, allows us to probe only shallow regions in the planetary interior. Also, the estimated core size is sensitive to high-pressure equation of state of hydrogen and helium, which is still highly uncertain. Obviously we need more direct constraints to the core size. As well known in the Earth science, the method that uses seismic waves is a powerful exploration method for planetary deep interior. Recently, we have launched a new project of network observation for detecting the free oscillation of Jupiter's surface, using Doppler spectro-imagers installed in the 1-2m class telescopes in Okayama Observatory and Ishigaki Observatory in Japan, Observatoire de Calren in France, and Apache Point Observatory in USA. In this presentation we first summarize the unresolved issues regarding the interior and origin of Jupiter and, then, introduce the newly launched project for probing the deep interior of Jupiter, which is called JOVIAL.