Results 71 to 80 of about 145,815 (295)

Planet Formation Regulated by Galactic-scale Interstellar Turbulence

The Astrophysical Journal Letters
Planet formation occurs over a few Myr within protoplanetary disks of dust and gas, which are often assumed to evolve in isolation. However, extended gaseous structures have been uncovered around many protoplanetary disks, suggestive of late-stage infall
Andrew J. Winter, Myriam Benisty, Sean M. Andrews   +2 more
doaj   +1 more source

Continuum Reverberation Mapping of AGN Accretion Disks

Frontiers in Astronomy and Space Sciences, 2017
We show recent detections of inter-band continuum lags in three AGN (NGC 5548, NGC 2617, and MCG+08-11-011), which provide new constraints on the temperature profiles and absolute sizes of the accretion disks.
Michael M. Fausnaugh, Michael M. Fausnaugh, Bradley M. Peterson, Bradley M. Peterson, Bradley M. Peterson, David A. Starkey, David A. Starkey, Keith Horne, the AGN STORM Collaboration   +8 more
doaj   +1 more source

On the Computation of Accretion Disk Spectra [PDF]

Astrophysics and Space Science, 1987
AbstractSpectra of accretion disks in dwarf novae and some novalike stars have been computed. Many simplifications to the general model of the nature of a cataclysmic variable are needed to make the system numerically tractable. The necessity, justification, and implications of such simplifications are discussed together with the influences of some ...
openaire   +1 more source

High‐Resolution Corrosion Fingerprinting of Alloy Libraries via Microdroplet Spectroelectrochemistry

Advanced Engineering Materials, EarlyView.
Ionic‐liquid microdroplet spectroelectrochemistry enables stable, localized electrochemical measurements over extended timescales. By coupling impedance spectroscopy, wetting analysis, finite‐element simulations, and operando Raman spectroscopy, it disentangles geometrical and electrochemical effects, opening new opportunities for rapid corrosion ...
Ekaterina Kurchavova, Oumaïma Gharbi, Mireille Turmine, Vincent Vivier   +3 more
wiley   +1 more source

Testing Magnetospheric Accretion as an Hα Emission Mechanism of Embedded Giant Planets: The Case Study for the Disk Exhibiting Meridional Flow Around HD 163296

The Astronomical Journal
Recent high-sensitivity observations reveal that accreting giant planets embedded in their parental circumstellar disks can emit H α at their final formation stages.
Yasuhiro Hasegawa, Taichi Uyama, Jun Hashimoto, Yuhiko Aoyama, Vincent Deo, Olivier Guyon, Julien Lozi, Barnaby Norris, Motohide Tamura, Sebastien Vievard   +9 more
doaj   +1 more source

Numerical models of accretion disks [PDF]

AIP Conference Proceedings, 1998
I review recent numerical studies of accretion disks, focusing on measurements of the turbulent shear stress, or $α$, in the shearing box model. I conclude with a list of astronomically relevant open questions that can be settled via future numerical experiments.
openaire   +2 more sources

Superlubricity and Corrosion Inhibition Properties of Solvate Ionic Liquids in Hybrid Carbon Fiber Reinforced Plastic–Steel Interfaces

Advanced Engineering Materials, EarlyView.
Solvate ionic liquids lubrication reduced the coefficient of friction by ∼60% compared to dry sliding, reaching steady‐state values as low as 0.04–0.05. Corrosion weight‐loss measurements in 1 M HCl further demonstrated significant inhibition behavior, with only 100 ppm of [Li(G3)][TFSI] (∼68.5 μL/L) reducing corrosion‐product weight loss by 63 ...
Sameh Dabees, Timothy Harte, Bhagya Dharmasiri, Y. Athulya Wickramasingha, David J. Hayne, Daniel J. Eyckens, Luke C. Henderson   +6 more
wiley   +1 more source

Accretion and Outflow from Young Stellar Disks

, 2010
We aim to monitor T Tauri star disk emission features and jet outflow morphologies to determine how these features vary with disk accretion rate, and how and when the outflow responds to major accretion events. Young stars are surrounded by circumstellar
Bicknell, Geoffrey, McGregor, Peter, Salmeron, Raquel, White, Marc, Beck, Tracy   +4 more
core  

The Observational Appearance of Slim Accretion Disks [PDF]

, 1996
We reexamine the hypothesis that the optical/UV/soft X-ray continuum of active galactic nuclei (AGNs) is thermal emission from an accretion disk. Previous studies have shown that fitting the spectra with the standard optically thick and geometrically ...
Abramowicz, Marek A, Szuszkiewicz, Ewa, Malkan, Matthew A   +2 more
core   +1 more source

Coordinated Space- and Ground-based Monitoring of Accretion Bursts in a Protoplanetary Disk: Establishing Mid-infrared Hydrogen Lines as Accretion Diagnostics for JWST/MIRI

The Astrophysical Journal
In this paper, we establish and calibrate mid-infrared (MIR) hydrogen recombination lines observed with the James Webb Space Telescope as accretion tracers for pre-main-sequence stars that accrete from circumstellar disks.
Benjamin M. Tofflemire, Carlo F. Manara, Andrea Banzatti, Klaus M. Pontoppidan, Joan Najita, Brunella Nisini, Emma T. Whelan, Justyn Campbell-White, Hala Alqubelat, Adam L. Kraus, Christian Rab, Adrien Houge, Sebastiaan Krijt, James Muzerolle, Eleonora Fiorellino, Myriam Benisty, Lukasz Tychoniec, Colette Salyk, Guillaume Bourdarot, Jacob Hyden   +19 more
doaj   +1 more source