Results 51 to 60 of about 425,590 (288)
Protoplanetary disk lifetimes vs stellar mass and possible implications for giant planet populations [PDF]
A&A 576, A52 (2015), 2015 We study the dependence of protoplanetary disk evolution on stellar mass using a large sample of young stellar objects in nearby young star-forming regions. We update the protoplanetary disk fractions presented in our recent work (paper I of this series) derived for 22 nearby (< 500 pc) associations between 1 and 100 Myr.
arxiv +1 more source
A Survey of C2H, HCN, and C18O in Protoplanetary Disks [PDF]
Astrophysical Journal, 2019 Molecular lines observed toward protoplanetary disks carry information about physical and chemical processes associated with planet formation. We present ALMA Band 6 observations of C2H, HCN, and C18O in a sample of 14 disks spanning a range of ages ...
J. Bergner +5 more
semanticscholar +1 more source
The Dispersal of Protoplanetary Disks [PDF]
, 2014 Protoplanetary disks are the sites of planet formation, and the evolution and eventual dispersal of these disks strongly influences the formation of planetary systems. Disk evolution during the planet-forming epoch is driven by accretion and mass-loss due to winds, and in typical environments photoevaporation by high-energy radiation from the central ...
Alexander, Richard +4 more
openaire +4 more sources
Water in Protoplanetary Disks [PDF]
Proceedings of the International Astronomical Union, 2012 AbstractInfrared water line emission from protoplanetary disks, recently observed by the Spitzer and Herschel space telescopes, is thought to trace the surface layer of the inner to outer regions of the disks. We have modelled the water abundance profile and line emission, especially focusing on the effects of dust size growth and turbulent mixing ...
Nomura, H. +3 more
openaire +3 more sources
Ionization and heating by X-rays and cosmic rays*
EPJ Web of Conferences, 2015 High-energy radiation from the central T Tauri and protostars plays an important role in shaping protoplanetary disks and influences their evolution. Such radiation, in particular X-rays and extreme-ultraviolet (EUV) radiation, is predominantly generated
Güdel Manuel
doaj +1 more source
Structured Distributions of Gas and Solids in Protoplanetary Disks [PDF]
arXiv, 2022 Recent spatially-resolved observations of protoplanetary disks revealed a plethora of substructures, including concentric rings and gaps, inner cavities, misalignments, spiral arms, and azimuthal asymmetries. This is the major breakthrough in studies of protoplanetary disks since Protostars and Planets VI and is reshaping the field of planet formation.
arxiv
From Birth to Death of Protoplanetary Disks: Modeling Their Formation, Evolution, and Dispersal [PDF]
Mon.Not.Roy.Astron.Soc. 461 (2016) 2257, 2016 Formation, evolution, and dispersal processes of protoplanetary disks are investigated and the disk lifetime is estimated. Gravitational collapse of a pre-stellar core forms both a central star and a protoplanetary disk. The central star grows by accretion from the disk, and irradiation by the central star heats up the disk and generates thermal wind ...
arxiv +1 more source
Cosmic-ray ionization rate in protoplanetary disks with sheared magnetic fields [PDF]
, 2022 We investigate the effects of magnetic field configurations on the ionization rate by cosmic rays in protoplanetary disks. First, we consider cosmic-ray propagation from the interstellar medium (ISM) to the protoplanetary disks and showed that the cosmic-ray density around the disk should be 2 times lower than the ISM value.
arxiv +1 more source
Radial Migration of Gap-opening Planets in Protoplanetary Disks. I. The Case of a Single Planet [PDF]
Astrophysical Journal, 2018 A large planet orbiting a star in a protoplanetary disk opens a density gap along its orbit due to the strong disk–planet interaction and migrates with the gap in the disk.
Kazuhiro D. Kanagawa +2 more
semanticscholar +1 more source
The Evolution of Protoplanetary Disk Edges [PDF]
The Astrophysical Journal, 2004 We investigate gap formation in gaseous protostellar disks by a planet in a circular orbit in the limit of low disk viscosity. This regime may be appropriate to an aging disk after the epoch of planet formation. We find that the distance of planet to the gap outer boundary can be between the location of the $m=2$ and $m=1$ outer Lindblad resonances ...
Varniere, P., Quillen, A.C., Frank, A.
openaire +5 more sources