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Solar system objects observed in the Sloan Digital Sky Survey commissioning data
We discuss measurements of the properties of D13,000 asteroids detected in 500 deg2 of sky in the Sloan Digital Sky Survey (SDSS) commissioning data. The moving objects are detected in the magnitude
Atmospheres of Protoplanetary Cores: Critical Mass for Nucleated Instability
We systematically study quasi-static atmospheres of accreting protoplanetary cores for different opacity behaviors and realistic planetesimal accretion rates in various parts of the protoplanetary
Can Giant Planets Form by Direct Gravitational Instability
Gravitational instability has been invoked as a possible mechanism of the giant planet production in protoplanetary disks. Here we critically revise its viability by noting that to form planets
Planetary torques as the viscosity of protoplanetary disks
We revisit the idea that density wave wakes of planets drive accretion in protostellar disks. The effects of many small planets can be represented as a viscosity if the wakes damp locally but the
Planet Migration and Gap Formation by Tidally Induced Shocks
Gap formation in a gas disk triggered by disk-planet tidal interaction is considered. Density waves launched by the planet are assumed to be damped as a result of their nonlinear evolution leading to
The local axisymmetric instability criterion in a thin, rotating, multicomponent disc
Purely gravitational perturbations are considered in a thin rotating disc composed of gas and several stellar components. The dispersion relation for the axisymmetric density waves propagating
Nonlinear Propagation of Planet-Generated Tidal Waves
The propagation and evolution of planet-generated density waves in protoplanetary disks is considered. The evolution of waves, leading to shock formation and wake dissipation, is followed in the
Discovery and spectroscopy of the young jovian planet 51 Eri b with the Gemini Planet Imager
Using the Gemini Planet Imager, a Jupiter-like planet is discovered orbiting the ~20-million-year-old star 51 Eridani at a projected separation of 13 astronomical units and has a methane signature and is probably the smallest exoplanet that has been directly imaged.
Global models of runaway accretion in white dwarf debris discs
A growing number of young white dwarfs (WDs) with metal-enriched atmospheres are accompanied by excess infrared (IR) emission, indicating that they are encircled by a compact dusty disc of solid
We explore the properties of cold gravitoturbulent accretion disks?non-fragmenting disks hovering on the verge of gravitational instability (GI)?using a realistic prescription for the effective