Results 21 to 30 of about 19,935 (257)
Protoplanetary Disks as (Possibly) Viscous Disks [PDF]
The Astrophysical Journal, 2017 Abstract Protoplanetary disks are believed to evolve on megayear timescales in a diffusive (viscous) manner as a result of angular momentum transport driven by internal stresses. Here we use a sample of 26 protoplanetary disks resolved by ALMA with measured (dust-based) masses and stellar accretion rates to derive the dimensionless α ...
Roman R. Rafikov, Roman R. Rafikov
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Photoevaporation of Protoplanetary Disks [PDF]
The Astrophysical Journal, 2008 We present HST/NICMOS Paschen alpha images and low and high resolution IRS spectra of photoevaporating disk-tail systems originally detected at 24 micron near O stars. We find no Paschen alpha emission in any of the systems. The resulting upper limits correspond to about 0.000002-0.000003 solar mass of mass in hydrogen in the tails suggesting that the ...
George H. Rieke +7 more
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Dust evolution in protoplanetary disks [PDF]
Proceedings of the International Astronomical Union, 2007 AbstractWe investigate the behaviour of dust in protoplanetary disks under the action of gas drag using our 3D, two-fluid (gas+dust) SPH code. We present the evolution of the dust spatial distribution in global simulations of planetless disks as well as of disks containing an already formed planet.
Gonzalez, Jean-François +3 more
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Dust Coagulation and Settling in Layered Protoplanetary Disks [PDF]
, 2006 Previous models of dust growth in protoplanetary disks considered either uniformly laminar or turbulent disks. This Letter explores how dust growth occurs in a layered protoplanetary disk in which the magnetorotational instability generates turbulence ...
Ciesla, Fred J.
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Dust Properties of Protoplanetary Disks in the Taurus-Auriga Star Forming Region from Millimeter Wavelengths [PDF]
, 2009 We present the most sensitive 3 mm-survey to date of protoplanetary disks carried in the Taurus-Auriga star forming region (average rms of about 0.3 mJy), using the IRAM PdBI.
A. Natta +82 more
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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
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Interferometry and the study of protoplanetary disks [PDF]
EPJ Web of Conferences, 2015 Interferometry offers access to scales that are unresolvable using single dish telescopes, which is especially important when investigating objects with small angular sizes, such as protoplanetary disks. This Chapter introduces the concept of interferometry, and describes the basic aspects of interferometric observations when considering long (i.e. sub-
Ilee, John David, Greaves, Jane Sophia
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The Astrophysical Journal, 2023 We present a three-dimensional, time-dependent MHD simulation of the short-term interaction between a protoplanetary disk and the stellar corona in a T Tauri system.
Ofer Cohen +6 more
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Low EUV Luminosities Impinging on Protoplanetary Disks [PDF]
, 2014 The amount of high-energy stellar radiation reaching the surface of protoplanetary disks is essential to determine their chemistry and physical evolution. Here, we use millimetric and centimetric radio data to constrain the EUV luminosity impinging on 14
Brooks, K. J. +6 more
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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
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