Numerical Models Of The Early Stages Of Planet Formation
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Numerical Models Of The Early Stages Of Planet Formation
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Author : Anders Johansen
language : en
Publisher:
Release Date : 2007
Numerical Models Of The Early Stages Of Planet Formation written by Anders Johansen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Numerical Models Of The Early Stages Of Planet Formation
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Author : Anders Johansen
language : en
Publisher: VDM Publishing
Release Date : 2008
Numerical Models Of The Early Stages Of Planet Formation written by Anders Johansen and has been published by VDM Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Science categories.
In the earliest stages of planet formation micrometer-sized dust grains collide and gradually build up kilometer-sized planetesimals, bodies that are so large that they can attract each other directly by gravity. This is an important landmark on the way to real planets because of the change to gravity-dominated growth. The road from boulders to planetesimals is however poorly known. Boulders have poor sticking properties and spiral into the young star due to the head wind from the slower rotating gas. This work presents the first detailed computer simulations of the motion of dust and boulders in turbulent protoplanetary discs. The turbulent diffusion coefficient of small dust grains is measured to be surprisingly high, whereas larger boulders concentrate by up to two orders of magnitude in transient high pressure regions that arise spontaneously in magnetorotational turbulence. The coupled motion of boulders and gas is found to be linearly unstable to the so-called streaming instability, leading to a turbulent state that is characterised by dense clumps of boulders that shield each other against the head wind of the gas.
The Early Stages Of Planet Formation In A Circumstellar Disc
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Author : Marina Galvagni
language : en
Publisher:
Release Date : 2013
The Early Stages Of Planet Formation In A Circumstellar Disc written by Marina Galvagni and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Numerical Models Of Terrestrial Core Formation And Early Planetary Evolution
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Author : Gregor Johann Golabek
language : en
Publisher:
Release Date : 2010
Numerical Models Of Terrestrial Core Formation And Early Planetary Evolution written by Gregor Johann Golabek and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Numerical Simulation Of The Final Stages Of Terrestrial Planet Formation
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Author : Larry Paul Cox
language : en
Publisher:
Release Date : 1978
Numerical Simulation Of The Final Stages Of Terrestrial Planet Formation written by Larry Paul Cox and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Computer simulation categories.
Planets In Turbulent Disks
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Author : Alexandros Ziampras
language : en
Publisher:
Release Date : 2022
Planets In Turbulent Disks written by Alexandros Ziampras and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Accretion disks are the birthplace of planets, the properties and evolution of which are highly sensitive to the thermo- and hydrodynamics of the gaseous disk that they are embedded in during their growth. Understanding the processes that define the structure of gas in the disk and the mechanisms that drive accretion is essential to modeling planet-disk interaction with numerical simulations. Over the course of this project, we look into various aspects of protoplanetary disk dynamics. We examine the impact of different radiative effects on planet-disk interaction, explore the behavior of planet-generated vortices, and investigate the physical properties of the vertical shear instability (VSI) as an accretion-driving mechanism in protoplanetary disks. To that end, we perform numerical hydrodynamics simulations of accretion disks with and without embedded planets, using a wide variety of physical and numerical parameters and various post-processing techniques in order to validate, compare, and understand the results of our models. We find that the equation of state is of key importance to modeling the formation of rings and gaps by planets, and highlight the impact of different radiative mechanisms on the density and temperature profile of the disk as well as on the lifetime of vortices generated by such planets. Regarding the VSI, we show that it is a competitive candidate in interpreting accretion in observations of protoplanetary disks and identify conditions for which a planet can coexist with or suppress the turbulent stress that this mechanism can generate. Finally, we find that the stress generated by vortices and spiral arms, while conducive to accretion, can weaken or quench the VSI and therefore limit its vertical mixing capacity. Our results outline that appropriate treatment of radiative effects is crucial in numerical models of planet-disk interaction. Our work also suggests that observing VSI signatures in the presence of massive planets is unlikely, but perhaps possible in the future and during earlier stages of planet formation.
In Quest Of The Universe
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Author : Theo Koupelis
language : en
Publisher: Jones & Bartlett Learning
Release Date : 2011
In Quest Of The Universe written by Theo Koupelis and has been published by Jones & Bartlett Learning this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Science categories.
Designed for the nonscience major, In Quest of the Universe, Sixth Edition, is a comprehensive, student-friendly introduction to astronomy. This accessible text guides readers through the development of historical and current astronomical theories to provide a clear account of how science works. Koupelis' distinct explanations acquaint students with their own solar system before moving on to the stars and distant galaxies. This flexible approach allows instructors to arrange the modules to fit their own course needs. With numerous interactive learning tools, the Starry Night planetary software package, and stunning visuals and up-to-date content, In Quest with the Universe, Sixth Edition is an exciting overview of this ever-changing discipline.
A Dialogue Concerning The Two Chief Models Of Planet Formation
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Author : Woolfson Michael Mark
language : en
Publisher: World Scientific
Release Date : 2017-05-22
A Dialogue Concerning The Two Chief Models Of Planet Formation written by Woolfson Michael Mark and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-05-22 with Science categories.
Two models for the origin of the Solar System, the Nebula Theory and the Capture Theory, are discussed by protagonists, Simon and Steven respectively, in the presence of Solomon, who oversees the discussions. Modelled on Galileo's Dialogue Concerning the Two Chief World Systems, this book provides new insight into different theories of cosmogony. The Nebula Theory, at present the standard model of planet formation, proposes that a star and planets are derived from a single spinning nebula. Woolfson here introduces an alternative, the Capture Theory, in which planets are produced from a protostar tidally disrupted by a condensed star which 'captures' most of the formed planets into orbits. These complex ideas are simplified and presented in an easily understandable, accessible way for all students of physics, astronomy, cosmology and those interested in the beginning of our world as we know it.
Nasa Technical Memorandum
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Author :
language : en
Publisher:
Release Date : 1991
Nasa Technical Memorandum written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aeronautics categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1992
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Aeronautics categories.