ar X iv : a st ro - p h / 04 12 27 0 v 1 1 0 D ec 2 00 4 Dead Zones and the Origin of Planetary Masses
نویسندگان
چکیده
Protoplanets accrete material from their natal protostellar disks until they are sufficiently massive to open a gap in the face of the disk's viscosity that arises from the magneto-rotational instability (MRI). By computing the ionization structure within observationally well-constrained disk models, we demonstrate that poorly ionized, low viscosity " dead zones " stretch out to 12 AU within typical disks. We find that planets of terrestrial mass robustly form within the dead zones while massive Jovian planets form beyond. Dead zones will also halt the rapid migration of planets into their central stars. Finally, we argue that the gravi-tational scattering of low mass planets formed in the dead zone, to larger radii by a rapidly accreting Jupiter beyond, can explain the distribution of planetary masses in our solar system.
منابع مشابه
ar X iv : a st ro - p h / 06 12 37 8 v 1 1 4 D ec 2 00 6 Magnetic fields , strings and cosmology
متن کامل
ar X iv : a st ro - p h / 02 12 56 6 v 1 3 0 D ec 2 00 2 Dark Energy : Is it Q or Λ ?
New observations of Cosmic Microwave Background Anisotropies, Su-pernovae luminosity distances and Galaxy Clustering are sharpening our knowledge about dark energy. Here we present the latest constraints.
متن کاملar X iv : a st ro - p h / 02 11 45 7 v 2 1 0 D ec 2 00 2 Time variation of fundamental constants : two phenomenological models
Time variation of fundamental constants, a strong signal of new physics, is analyzed comparing extant data with two phenomenological models. Results are discussed.
متن کاملar X iv : a st ro - p h / 00 06 29 0 v 1 2 1 Ju n 20 00 Gas Rich Dwarfs from the PSS - II III . H I Profiles and Dynamical Masses
We present Arecibo neutral hydrogen data on a sample of optically selected dwarf galaxies.
متن کاملar X iv : a st ro - p h / 04 01 12 2 v 1 8 J an 2 00 4 High Energy Gamma - Ray
The physics results of high energy γ-ray astronomy are reported, emphasizing recent achievements with ground-based detectors. This includes some of the instrumental developments and latest projects. The fundamental contribution of the field to the question of Cosmic Ray origin is highlighted.
متن کامل