搜索结果: 1-15 共查到“天文学 Protoplanetary disks”相关记录15条 . 查询时间(0.087 秒)
Evidence for Multiple Pathways to Deuterium Enhancements in Protoplanetary Disks
Evidence Multiple Pathways Deuterium Enhancements Protoplanetary Disks
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2012/2/23
The distributions of deuterated molecules in protoplanetary disks are expected to depend on the molecular formation pathways. We use observations of spatially resolved DCN emission from the disk aroun...
Gaps in Protoplanetary Disks as Signatures of Planets: I. Methodology and Validation
planet disk interactions protoplanetary disks planets and satellites detection radiative
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2012/2/23
We examine the observational consequences of partial gaps being opened by planets in protoplanetary disks. We model the disk using a static alpha-disk model with detailed radiative transfer, parametri...
Turbulent Linewidths in Protoplanetary Disks: Predictions from Numerical Simulations
Turbulent Linewidths Protoplanetary Disks: Predictions Numerical Simulations
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2011/10/11
Sub-mm observations of protoplanetary disks now approach the acuity needed to measure the turbulent broadening of molecular lines. These measurements constrain disk angular momentum transport, and fur...
The propagation of Lyman-alpha in evolving protoplanetary disks
propagation Lyman-alpha evolving protoplanetary
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2011/10/11
We study the role resonant scattering plays in the transport of Lyman-alpha photons in accreting protoplanetary disk systems subject to varying degrees of dust settling. While the intrinsic stellar FU...
The Role of Tiny Grains on the Accretion Process in Protoplanetary Disks
Tiny Grains Accretion Process Protoplanetary Disks
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2011/10/9
Tiny grains such as PAHs have been thought to dramatically reduce the coupling between gas and magnetic fields in weakly ionized gas such as in protoplanetary disks (PPDs) because they provide tremend...
Magnetorotational Instability Driven Accretion in Protoplanetary Disks
Instability Driven Accretion Protoplanetary
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2011/10/9
The gas dynamics in protoplanetary disks (PPDs) is strongly affected by non-ideal MHD effects. Using a complex chemical reaction network with standard prescriptions for X-ray and cosmic-ray ionization...
Dynamics of Protoplanetary Disks
protoplanetary disks accretion pre-main-sequence stars
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2010/11/11
Protoplanetary disks are quasi-steady structures whose evolution and dispersal determine the environ-ment for planet formation. I review the theory of protoplanetary disk evolution and its connection ...
The baroclinic instability in the context of layered accretion. Self-sustained vortices and their magnetic stability in local compressible unstratified models of protoplanetary disks
baroclinic instability magnetic stability protoplanetary disks
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2010/11/10
Context. Turbulence and angular momentum transport in accretion disks remain a topic of debate. With the realization that dead zones are robust features of protoplanetary disks, the search for hydrody...
A Submillimeter Array Survey of Protoplanetary Disks in the Orion Nebula Cluster
Solar and Stellar Astrophysics (astro-ph.SR)
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2010/12/28
We present the full results of our 3-year long Submillimeter Array survey of protoplanetary disks in the Orion Nebula Cluster. We imaged 23 fields at 880 microns and 2 fields at 1330 microns, covering...
The (sub-)millimeter SED of protoplanetary disks in the outskirts of the Orion Nebula Cluster
Earth and Planetary Astrophysics (astro-ph.EP)
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2010/12/28
We present the sub-mm/mm SED for a sample of eight young circumstellar disks in the outer regions of the Orion Nebula Cluster.
Short Lifetime of Protoplanetary Disks in Low-metallicity Environments
Solar and Stellar Astrophysics (astro-ph.SR)
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2010/12/28
We studied near-infrared disk fractions of six young clusters in the low-metallicity environments with [O/H$] \sim -0.7$ using deep $JHK$ images with Subaru 8.2\,m telescope.
Gravities and metallicities of stars with protoplanetary disks
stars Gravities metallicities protoplanetary disks
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2009/7/1
Gravities and metallicities of stars with protoplanetary disks。
Global Evolution of Solids in Protoplanetary Disks：a Simple Model
Protoplanetary Disks Global Evolution
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2009/6/16
Global Evolution of Solids in Protoplanetary Disks：a Simple Model。
Hα Fabry-Perot Study in the Orion Nebula (M 42)：Protoplanetary Disks
Orion Nebula Protoplanetary Disks
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2009/6/9
Hα Fabry-Perot Study in the Orion Nebula (M 42)：Protoplanetary Disks。
The Magneto-Rotational Instability in Protoplanetary Disks
Magneto-Rotational Instability Protoplanetary Disks
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2009/6/9
The Magneto-Rotational Instability in Protoplanetary Disks。