THE LONG-TERM EVOLUTION OF PHOTOEVAPORATING PROTOPLANETARY DISKS
نویسندگان
چکیده
منابع مشابه
SPITZER/MIPS 24 μm DETECTION OF PHOTOEVAPORATING PROTOPLANETARY DISKS
We present 24 μm images of three protoplanetary disks being photoevaporated around high mass O type stars. These objects have “cometary” structure where the dust pulled away from the disk by the photoevaporating flow is forced away from the O star by photon pressure on the dust and heating and ionization of the gas. Models of the 24 μm and 8 μm brightness profiles agree with this hypothesis. Th...
متن کاملDynamical Evolution of Protoplanetary Disks
This paper reviews the theory of protostellar debris disks. After a brief introduction to accretion disk physics, I describe coagulation models of planet formation in the outer regions of planetesimal disks. Coagulation models for the Kuiper Belt produce Pluto-sized objects on timescales of 10–40 Myr. These models yield size distributions which agree with observations of Kuiper Belt objects wit...
متن کاملThe Chemical Evolution of Protoplanetary Disks
In this review we re-evaluate our observational and theoretical understanding of the chemical evolution of protoplanetary disks. We discuss how improved observational capabilities have enabled the detection of numerous molecules exposing an active disk chemistry that appears to be in disequilibrium. We outline the primary facets of static and dynamical theoretical chemical models. Such models h...
متن کاملDynamical Evolution of Planetesimals in Protoplanetary Disks
The current picture of terrestrial planet formation relies heavily on our understanding of the dynamical evolution of planetesimals — asteroid-like bodies thought to be planetary building blocks. In this study we investigate the growth of eccentricities and inclinations of planetesimals in spatially homogeneous protoplanetary disks using methods of kinetic theory. Emphasis is put on clarifying ...
متن کاملThe Evolution of Long-term Care Programs; Comment on “Financing Long-term Care: Lessons From Japan”
The need for long-term care (LTC) represents a “new social risk,” one that overlaps with and complements systems of care that pre-date such programs, complicating LTC program design. This commentary expands on Ikegami’s discussion of how these structural factors must be accommodated, as well as historical and cultural factors that influence public expectations of such a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2013
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/774/1/57