Photophoresis in the circumjovian disk and its impact on the orbital configuration of the Galilean satellites

Arakawa, Sota; Shibaike, Yuhito (2019). Photophoresis in the circumjovian disk and its impact on the orbital configuration of the Galilean satellites. Astronomy and astrophysics, 629, A106. EDP Sciences 10.1051/0004-6361/201936202

[img] Text
aa36202-19.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (827kB) | Request a copy

Jupiter has four large regular satellites called the Galilean satellites: Io, Europa, Ganymede, and Callisto. The inner three of the Galilean satellites orbit in a 4:2:1 mean motion resonance; therefore their orbital configuration may originate from the stopping of the migration of Io near the bump in the surface density distribution and following resonant trapping of Europa and Ganymede. The formation mechanism of the bump near the orbit of the innermost satellite, Io, is not yet understood, however. Here, we show that photophoresis in the circumjovian disk could be the cause of the bump using analytic calculations of steady-state accretion disks. We propose that photophoresis in the circumjovian disk could stop the inward migration of dust particles near the orbit of Io. The resulting dust-depleted inner region would have a higher ionization fraction, and thus admit increased magnetorotational-instability-driven accretion stress in comparison to the outer region. The increase of the accretion stress at the photophoretic dust barrier would form a bump in the surface density distribution, halting the migration of Io.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Shibaike, Yuhito

Subjects:

500 Science
500 Science > 520 Astronomy
500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Janine Jungo

Date Deposited:

21 Apr 2020 13:09

Last Modified:

26 Apr 2020 02:47

Publisher DOI:

10.1051/0004-6361/201936202

BORIS DOI:

10.7892/boris.142988

URI:

https://boris.unibe.ch/id/eprint/142988

Actions (login required)

Edit item Edit item
Provide Feedback