Results 1 to 10 of about 14,221 (195)
Particle confinement in a non-axisymmetric protoplanetary nebula [PDF]
Open Astronomy, 1999 Fuente Marcos C. de la, Barge P.
doaj +4 more sources
Igneous processes in the small bodies of the Solar System I. Asteroids and comets [PDF]
iScience, 2023 Summary: Igneous processes were quite widespread in the small bodies of the Solar System (SBSS) and were initially fueled by short-lived radioisotopes, the proto-Sun, impact heating, and differentiation heating.
Giovanni Leone, Hiroyuki K.M. Tanaka
doaj +2 more sources
Igneous meteorites suggest Aluminium-26 heterogeneity in the early Solar Nebula [PDF]
Nature Communications, 2023 The short-lived radionuclide aluminium-26 (26Al) isotope is a major heat source for early planetary melting. The aluminium-26 – magnesium-26 (26Al-26Mg) decay system also serves as a high-resolution relative chronometer.
Evgenii Krestianinov +11 more
doaj +2 more sources
Vertical Distribution and Kinematics of Protoplanetary Nebulae in the Galaxy [PDF]
Astronomy Letters, 2017, V 43, Issue 7, 452, 2017 The catalogue of protoplanetary nebulae by Vickers et al. has been supplemented with the line-of-sight velocities and proper motions of their central stars from the literature. Based on an exponential density distribution, we have estimated the vertical scale height from objects with an age less than 3 Gyr belonging to the Galactic thin disk ...
Anisa T. Bajkova, Vadim V. Bobylev
arxiv +5 more sources
Destruction of protoplanetary discs in the Orion Nebula Cluster [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 We use numerical N-body simulations of the Orion Nebula Cluster (ONC) to investigate the destruction of protoplanetary disks by close stellar encounters and UV radiation from massive stars. The simulations model a cluster of 4000 stars, and we consider separately cases in which the disks have fixed radii of 100 AU and 10 AU.
Aylwyn Scally, Catherine Clarke
openaire +4 more sources
A Simplified Model for an Evolving Protoplanetary Nebula [PDF]
The Astrophysical Journal, 2003 The dynamical evolution of the protoplanetary nebula is investigated using analytical solutions of the surface density transport equations. Constant and beta viscosity turbulence models are compared with a functional analytical model and the well-known alpha viscosity formulation.
Sanford S. Davis
openaire +2 more sources
Size-selective concentration of chondrules and other small particles in protoplanetary nebula turbulence [PDF]
, 2000 Size-selective concentration of particles in a weakly turbulent protoplanetary nebula may be responsible for the initial collection of chondrules and other constituents into primitive body precursors. This paper presents the main elements of this process of turbulent concentration. In the terrestrial planet region, both the characteristic size and size
Jeffrey N. Cuzzi +3 more
arxiv +3 more sources
Clumpy Flows in Protoplanetary and Planetary Nebulae [PDF]
arXiv, 2003 Many astrophysical flows occur in inhomogeneous media. We briefly discuss some general properties of the adiabatic and radiative inhomogeneous systems and discuss the relevance of those properties to the planetary nebulae systems. We then focus on radiative hypersonic bullets and the applicability of this model to planetary and protoplanetary systems ...
Poludnenko, A. Y., Frank, A., Mitran, S.
arxiv +3 more sources
CHEMICAL EVOLUTION OF TURBULENT PROTOPLANETARY DISKS AND THE SOLAR NEBULA [PDF]
The Astrophysical Journal Supplement Series, 2011 This is the second paper in a series where we study the influence of transport processes on the chemical evolution of protoplanetary disks. Our analysis is based on a flared alpha-model of the DM Tau system, coupled to a large gas-grain chemical network.
Dmitri Wiebe +2 more
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Individual and Average Behavior of Particles in a Protoplanetary Nebula [PDF]
The Astrophysical Journal, 2004 15 pages, 9 figures, submitted to ...
Pascale Garaud +2 more
openaire +5 more sources