Three‐dimensional Simulations of the Gravitational Collapse of Logatropic Molecular Cloud Cores

2002 ◽  
Vol 570 (1) ◽  
pp. 231-244 ◽  
Author(s):  
Michael A. Reid ◽  
Ralph E. Pudritz ◽  
James Wadsley
Keyword(s):  
Gravitational Collapse ◽  
Molecular Cloud ◽  
Three Dimensional ◽  
Cloud Cores ◽  
Three Dimensional Simulations

scholarly journals Star–disc alignment in the protoplanetary discs: SPH simulation of the collapse of turbulent molecular cloud cores

2020 ◽  
Vol 492 (4) ◽  
pp. 5641-5654 ◽  
Author(s):  
Daisuke Takaishi ◽  
Yusuke Tsukamoto ◽  
Yasushi Suto
Keyword(s):  
Time Scale ◽  
Molecular Cloud ◽  
Three Dimensional ◽  
Gravitational Energy ◽  
Circumstellar Envelope ◽  
Rotation Axes ◽  
Particle Hydrodynamics ◽  
Disc Rotation ◽  
Cloud Cores ◽  
Sph Simulation

ABSTRACT We perform a series of three-dimensional smoothed particle hydrodynamics (SPH) simulations to study the evolution of the angle between the protostellar spin and the protoplanetary disc rotation axes (the star–disc angle ψsd) in turbulent molecular cloud cores. While ψsd at the protostar formation epoch exhibits broad distribution up to ∼130°, ψsd decreases (≲ 20°) in a time-scale of ∼104 yr. This time-scale of the star–disc alignment, talignment, corresponds basically to the mass doubling time of the central protostar, in which the protostar forgets its initial spin direction due to the mass accretion from the disc. Values of ψsd both at t = 102 yr and t = 105 yr after the protostar formation are independent of the ratios of thermal and turbulent energies to gravitational energy of the initial cloud cores: α = Ethermal/|Egravity| and γturb = Eturbulence/|Egravity|. We also find that a warped disc is possibly formed by the turbulent accretion flow from the circumstellar envelope.

scholarly journals Gravitational Collapse and Fragmentation of Molecular Cloud Cores with GADGET‐2

2007 ◽  
Vol 666 (1) ◽  
pp. 290-308 ◽  
Author(s):  
Guillermo Arreaga‐Garcia ◽  
Jaime Klapp ◽  
Leonardo Di G. Sigalotti ◽  
Ruslan Gabbasov
Keyword(s):  
Gravitational Collapse ◽  
Molecular Cloud ◽  
Cloud Cores

scholarly journals THE ANGULAR MOMENTUM OF MAGNETIZED MOLECULAR CLOUD CORES: A TWO-DIMENSIONAL-THREE-DIMENSIONAL COMPARISON

2010 ◽  
Vol 723 (1) ◽  
pp. 425-439 ◽  
Author(s):  
Sami Dib ◽  
Patrick Hennebelle ◽  
Jaime E. Pineda ◽  
Timea Csengeri ◽  
Sylvain Bontemps ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Molecular Cloud ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Cloud Cores
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