Results 31 to 40 of about 19,935 (257)

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

Effect of dust grain porosity on the appearance of protoplanetary disks [PDF]

, 2014
We theoretically analyze protoplanetary disks consisting of porous dust grains. In the analysis of observations of protoplanetary disks the dust phase is often assumed to consist of spherical grains, allowing one to apply the Mie scattering formalism ...
Kirchschlager, F., Wolf, S.
core   +1 more source

CHEMICAL PROCESSES IN PROTOPLANETARY DISKS [PDF]

The Astrophysical Journal, 2010
24 pages, 13 figures, accepted for publication in ...
Walsh, C, Millar, TJ, Nomura, H
openaire   +4 more sources

Centimeter-sized Grains in the Compact Dust Ring around Very-low-mass Star CIDA 1

The Astronomical Journal, 2023
We examined the grain size in the dust ring encircling the 0.19 M _☉ T Tauri star CIDA 1 using the Karl G. Jansky Very Large Array at multiple centimeter wavelengths, with a spatial resolution of 0.″2–0.″9. We detected distinct partial-ring structures at
Jun Hashimoto, Hauyu Baobab Liu, Ruobing Dong, Beibei Liu, Takayuki Muto, Yuka Terada   +5 more
doaj   +1 more source

Shadows, gaps, and ring-like structures in protoplanetary disks [PDF]

, 2011
We study the structure of passively heated disks around T Tauri and Herbig Ae stars, and present a vectorized Monte Carlo dust radiative transfer model of protoplanetary disks. The vectorization provides a speed up factor of 100 when compared to a scalar
Acke, Alexander, Alexander, Asplund, Beckwith, Bertout, Bjorkman, Bouwman, Brown, Brown, Calvet, Charnoz, Chiang, Cieza, Draine, Draine, Dullemond, Dullemond, Dullemond, Dullemond, Dullemond, Dullemond, D’Alessio, Edgar, Eisner, Espaillat, F. Heymann, Fitzpatrick, Fleck, Fukagawa, Furlan, Furlan, Gail, Hayashi, Huelamo, Ida, Isella, Ivezic, Kalas, Kama, Kemper, Kenyon, Kessler-Silacci, Klahr, Krijt, Krügel, Lagrange, Lommen, Lommen, Lubow, Lucy, Malfait, Mayama, McCaughrean, Millan-Gabet, Min, Min, Miroshnichenko, Mizuno, Mulders, Muzerolle, Najita, Najita, Natta, Natta, Nomura, Oliveira, Olofsson, Ozernoy, Pascucci, Pinte, Pinte, Pinte, Pontoppidan, Pontoppidan, R. Siebenmorgen, Ratzka, Ricci, Robitaille, Robitaille, Schegerer, Schegerer, Schisano, Siebenmorgen, Siebenmorgen, Sterzik, Strom, Testi, Thalmann, Tielens, Tutukov, van Boekel, van den Ancker, Verhoeff, Vinkovic, Visser, Voshchinikov, Walker, Waters, Watson, Watson, Whitney, Witt, Wolf, Zubko   +104 more
core   +2 more sources

Dust amorphization in protoplanetary disks [PDF]

Astronomy & Astrophysics, 2009
accepted for publication by A& ...
Marc Audard, Th. Henning, Sebastian Wolf, Dan M. Watson, A. A. Schegerer, Manuel Güdel, Adrian M. Glauser, Adrian M. Glauser, C. Baldovin-Saavedra   +8 more
openaire   +6 more sources

Formation of the First Planetesimals via the Streaming Instability in Globally Turbulent Protoplanetary Disks?

The Astrophysical Journal, 2023
Using self-consistent models of turbulent particle growth in an evolving protoplanetary nebula of solar composition, we find that recently proposed local metallicity and Stokes number criteria necessary for the streaming instability to generate ...
Paul R. Estrada, Orkan M. Umurhan
doaj   +1 more source

On the Gravitational Instabilities of Protoplanetary Disks [PDF]

Publications of the Astronomical Society of the Pacific, 2019
The gravitational instabilities are important to the evolution of the disks and the planet formation in the disks. We calculate the evolution of the disks which form from the collapse of the molecular cloud cores. By changing the properties of the cloud cores and the hydrodynamical viscosity parameters, we explore their effects on the properties of the
Ning Sui, Ping He, Min Li
openaire   +5 more sources

Scattered Radiation of Protoplanetary Disks

Universe, 2022
Scattered radiation of circumstellar (CS) dust plays an important role in the physics of young stars. Its observational manifestations are various but more often they are connected with the appearance of intrinsic polarization in young stars and their CS
Vladimir P. Grinin, Larisa V. Tambovtseva   +1 more
doaj   +1 more source

Self-Sustained Ionization and Vanishing Dead Zones in Protoplanetary Disks

, 2005
We analyze the ionization state of the magnetohydrodynamically turbulent protoplanetary disks and propose a new mechanism of sustaining ionization. First, we show that in the quasi-steady state of turbulence driven by magnetorotational instability in a ...
Inutsuka, Shu-ichiro, Sano, Takayoshi
core   +1 more source