Results 41 to 50 of about 400,542 (301)
Massive Protostellar Disks as a Hot Laboratory of Silicate Grain Evolution
The Astrophysical Journal, 2023 Typical accretion disks around massive protostars are hot enough for water ice to sublimate. We here propose to utilize the massive protostellar disks for investigating the collisional evolution of silicate grains with no ice mantle, which is an ...
Ryota Yamamuro +2 more
doaj +1 more source
ALMA Survey of Lupus Protoplanetary Disks. II. Gas Disk Radii [PDF]
, 2018 We present Atacama Large Millimeter/Sub-Millimeter Array (ALMA) Band 6 observations of a complete sample of protoplanetary disks in the young (∼1–3 Myr) Lupus star-forming region, covering the 1.33 mm continuum and the 12CO, 13CO, and C18O J = 2–1 lines.
M. Ansdell +12 more
semanticscholar +1 more source
Streaming Instability in Turbulent Protoplanetary Disks [PDF]
Astrophysical Journal, 2019 The streaming instability for solid particles in protoplanetary disks is reexamined assuming the familiar alpha (α) model for isotropic turbulence. Turbulence always reduces the growth rates of the streaming instability relative to values calculated for ...
O. Umurhan, P. Estrada, J. Cuzzi
semanticscholar +1 more source
An Evolutionary Study of Volatile Chemistry in Protoplanetary Disks [PDF]
Astrophysical Journal, 2020 The volatile composition of a planet is determined by the inventory of gas and ice in the parent disk. The volatile chemistry in the disk is expected to evolve over time, though this evolution is poorly constrained observationally.
J. Bergner +13 more
semanticscholar +1 more source
Including Dust Coagulation in Hydrodynamic Models of Protoplanetary Disks: Dust Evolution in the Vicinity of a Jupiter-mass Planet [PDF]
Astrophysical Journal, 2019 Dust growth is often neglected when building models of protoplanetary disks due to its complexity and computational expense. However, it does play a major role in shaping the evolution of protoplanetary dust and planet formation.
J. Dra̧żkowska +4 more
semanticscholar +1 more source
Shadows, gaps, and ring-like structures in protoplanetary disks [PDF]
, 2011 We study the structure of passively heated disks around T Tauri and Herbig Ae stars, and present a vectorized Monte Carlo dust radiative transfer model of protoplanetary disks. The vectorization provides a speed up factor of 100 when compared to a scalar
Acke +104 more
core +2 more sources
A Survey of C2H, HCN, and C18O in Protoplanetary Disks [PDF]
Astrophysical Journal, 2019 Molecular lines observed toward protoplanetary disks carry information about physical and chemical processes associated with planet formation. We present ALMA Band 6 observations of C2H, HCN, and C18O in a sample of 14 disks spanning a range of ages ...
J. Bergner +5 more
semanticscholar +1 more source
MAGNETO-THERMAL DISK WINDS FROM PROTOPLANETARY DISKS [PDF]
The Astrophysical Journal, 2016 ABSTRACT The global evolution and dispersal of protoplanetary disks (PPDs) are governed by disk angular-momentum transport and mass-loss processes. Recent numerical studies suggest that angular-momentum transport in the inner region of PPDs is largely driven by magnetized disk wind, yet the wind mass-loss rate remains unconstrained.
Xue-Ning Bai +3 more
openaire +2 more sources
Dust Coagulation and Settling in Layered Protoplanetary Disks [PDF]
, 2006 Previous models of dust growth in protoplanetary disks considered either uniformly laminar or turbulent disks. This Letter explores how dust growth occurs in a layered protoplanetary disk in which the magnetorotational instability generates turbulence ...
Ciesla, Fred J.
core +2 more sources
Probing CO and N2 Snow Surfaces in Protoplanetary Disks with N2H+ Emission [PDF]
Astrophysical Journal, 2019 Snowlines of major volatiles regulate the gas and solid C/N/O ratios in the planet-forming midplanes of protoplanetary disks. Snow surfaces are the 2D extensions of snowlines in the outer disk regions, where radiative heating results in an increasing ...
C. Qi +8 more
semanticscholar +1 more source