Photophoresis in the circumjovian disk and its impact on the orbital configuration of the Galilean satellites
arXiv:1908.03128 · doi:10.1051/0004-6361/201936202
Abstract
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 than 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.
8 pages, 9 figures. Accepted for publication in Astronomy & Astrophysics
References in corpus (14)
- On the Luminosity of Young Jupiters
- Radial migration of gap-opening planets in protoplanetary disks. I. The case of a single planet
- Migration of massive planets in accreting disks
- Convective Overstability in radially stratified accretion disks under thermal relaxation
- On the Terminal Rotation Rates of Giant Planets
- Convective overstability in accretion disks: 3D linear analysis and nonlinear saturation
- Temperature Structure in the Inner Regions of Protoplanetary Disks: Inefficient Accretion Heating Controlled by Nonideal Magnetohydrodynamics
- On the Viability of the Magnetorotational Instability in Circumplanetary Disks
- 3D Simulations of Planet Trapping at Disc-Cavity Boundaries
- Satellitesimal Formation via Collisional Dust Growth in Steady Circumplanetary Disks
- Thermal conductivity of porous aggregates
- Thermal conductivity and coordination number of compressed dust aggregates
- Photophoretic Structuring of Circumstellar Dust Disks
- Photophoretic Levitation and Trapping of Dust in the Inner Regions of Protoplanetary Disks