Results 1 to 10 of about 376,241 (261)
Protoplanetary Disk Chemistry [PDF]
Annual Review of Astronomy and Astrophysics, 2023 Planets form in disks of gas and dust around young stars. The disk molecular reservoirs and their chemical evolution affect all aspects of planet formation, from the coagulation of dust grains into pebbles to the elemental and molecular compositions of the mature planet.
Öberg, Karin I. +2 more
openaire +3 more sources
Chemistry in Protoplanetary Disks [PDF]
Chemical Reviews, 2013 This comprehensive review summarizes our current understanding of the evolution of gas, solids and molecular ices in protoplanetary disks. Key findings related to disk physics and chemistry, both observationally and theoretically, are highlighted.
Dmitry Semenov, Thomas Henning
openaire +4 more sources
Photoprocesses in protoplanetary disks [PDF]
Faraday Discussions, 2006 Circumstellar disks are exposed to intense ultraviolet radiation from the young star. In the inner disks, the UV radiation can be enhanced by more than seven orders of magnitude compared with the average interstellar field, resulting in a physical and chemical structure that resembles that of a dense photon-dominated region (PDR). This intense UV field
Marc C. van Hemert +2 more
openaire +4 more sources
Vortices in Protoplanetary Disks [PDF]
The Astrophysical Journal, 1999 We use a high order accuracy spectral code to carry out two-dimensional time-dependent numerical simulations of vortices in accretion disks. In particular, we examine the stability and the life time of vortices in circumstellar disks around young stellar objects. The results show that cyclonic vortices dissipate quickly, while anticyclonic vortices can
Godon, Patrick., Livio, Mario.
openaire +3 more sources
Volatiles in Protoplanetary Disks [PDF]
, 2014 Volatiles are compounds with low sublimation temperatures, and they make up most of the condensible mass in typical planet-forming environments. They consist of relatively small, often hydrogenated, molecules based on the abundant elements carbon, nitrogen and oxygen.
Pontoppidan, K. M. +6 more
openaire +5 more sources
HNC IN PROTOPLANETARY DISKS [PDF]
The Astrophysical Journal, 2015 The distributions and abundances of small organics in protoplanetary disks are potentially powerful probes of disk physics and chemistry. HNC is a common probe of dense interstellar regions and the target of this study. We use the Submillimeter Array (SMA) to observe HNC 3--2 towards the protoplanetary disks around the T Tauri star TW Hya and the ...
Dawn Graninger +3 more
openaire +4 more sources
SILICA IN PROTOPLANETARY DISKS [PDF]
The Astrophysical Journal, 2008 47 pages, 9 figures, to appear in the 1 January, 2009 issue of the Astrophysical ...
Gregory C. Sloan +13 more
openaire +3 more sources
Protoplanetary Disks and Their Evolution [PDF]
Annual Review of Astronomy and Astrophysics, 2011 Flattened, rotating disks of cool dust and gas extending for tens to hundreds of astronomical units are found around almost all low-mass stars shortly after their birth. These disks generally persist for several million years, during which time some material accretes onto the star, some is lost through outflows and photoevaporation, and some condenses
Jonathan Williams, Lucas A. Cieza
openaire +3 more sources
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
openaire +3 more sources
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
openaire +3 more sources