WorldCat Identities

Armitage, Philip J. 1971-

Works: 5 works in 20 publications in 1 language and 324 library holdings
Roles: Author
Publication Timeline
Most widely held works by Philip J Armitage
Astrophysics of planet formation by Philip J Armitage( Book )

16 editions published between 2009 and 2013 in English and held by 316 WorldCat member libraries worldwide

"The study of planet formation has been revolutionized by recent observational breakthroughs, which have allowed the detection and characterization of extrasolar planets, the imaging of protoplanetary disks, and the discovery of the Solar System's Kuiper Belt. Written for beginning graduate students, this textbook provides a basic understanding of the astrophysical processes that shape the formation of planetary systems. It begins by describing the structure and evolution of protoplanetary disks, moves on to the formation of planetesimals, terrestrial and gas giant planets, and concludes by surveying new theoretical ideas for the early evolution of planetary systems. Covering all phases of planet formation - from protoplanetary disks to the dynamical evolution of planetary systems - this introduction can be understood by readers with backgrounds in planetary science, observational and theoretical astronomy. It highlights the physical principles underlying planet formation and the areas where more research and new observations are needed"--Back cover
Mixing of dust in protoplanetary disks and the solar nebula by Anna Louise Haugsjaa Hughes( )

1 edition published in 2011 in English and held by 2 WorldCat member libraries worldwide

Understanding the small-dust component of protoplanetary disks is key to understanding the conditions for planet formation. Small dust grains, particularly at large distances, provide our primary observational window into the physics of protoplanetary disks, being much more easily observed than the gas component. Furthermore, the distribution of these grains must ultimately control the timing and locations for planetesimal formation, the first major step toward planet formation. For my thesis work, I have used numerical simulations to model the radial distribution of dust grains as they are acted upon by the gas disk, including the evolution of the disk (outward expansion and inward accretion), radial and azimuthal drag of the gas flow on the particle orbits, and turbulent mixing of the particle ensemble radially within the disk. I have run simulations using a range of particle sizes and disk-model parameters and consider primarily two phenomena: the radial diffusion of hot, inner disk particles outward to large AU, relevant to the compositional makeup of bodies within our own solar system, and the time evolution of the global dust-to-gas ratio, which dictates the supply of solid material to the planetesimal- and planet-forming regions. I find that, while the degree out outward mixing depends sensitively on a number of disk-model parameters, the behavior of the global dust-to-gas distribution is relatively uniform between different disk-model simulations, suggesting that, while still mysterious, the conditions for planetesimal formation are commonly met across a range of disk configurations. Observed disk compositions correlate poorly with most observable disk parameters. However, my simulations suggest compositional properties are most-strongly controlled by the initial conditions of young disk systems
Suppression of giant planet formation in stellar clusters( )

1 edition published in 2000 in English and held by 2 WorldCat member libraries worldwide

Accretion, accretion discs, solar system: formation, stars: formation, planetary systems, globular clusters: general, open clusters and associations: general
Episodic accretion in magnetically layered protoplanetary discs( )

1 edition published in 2001 in English and held by 2 WorldCat member libraries worldwide

Simulations of accretion flows crossing the last stable orbit( )

1 edition published in 2000 in English and held by 2 WorldCat member libraries worldwide

Accretion, accretion disk, black hole physics, MHD, stars: neutron, hydrodynamics, instabilities
Audience Level
Audience Level
  Kids General Special  
Audience level: 0.66 (from 0.56 for Mixing of ... to 0.95 for Simulation ...)

Associated Subjects
Astrophysics of planet formation
Alternative Names
Philip J. Armitage British astrophysicist

Philip J. Armitage Brits astrofysicus

English (20)