Results 41 to 50 of about 3,177 (205)

The Radial Distribution and Excitation of H2 around Young Stars in the HST-ULLYSES Survey

The Astronomical Journal, 2023
The spatial distribution and evolution of gas in the inner 10 au of protoplanetary disks form the basis for estimating the initial conditions of planet formation.
Kevin France, Nicole Arulanantham, Erin Maloney, P. Wilson Cauley, P. Ábrahám, Juan M. Alcalá, Justyn Campbell-White, Eleonora Fiorellino, Gregory J. Herczeg, Brunella Nisini, Miguel Vioque   +10 more
doaj   +1 more source

Gas-Phase Synthesis of Coronene through Stepwise Directed Ring Annulation [PDF]

, 2023
Molecular beam experiments together with electronic structure calculations provide the first evidence of a complex network of elementary gas-phase reactions culminating in the bottom-up preparation of the 24π aromatic coronene (C24H12) moleculea ...
Yahaira Reyes (14511379), Lotefa B. Tuli (14278686), Patrick Hemberger (710154), Ralf I. Kaiser (1793893), Stanislaw F. Wnuk (1317564), Andrew M. Turner (11868067), A. Hasan Howlader (5104529), Shane J. Goettl (11014649), Alexander M. Mebel (1566913)   +8 more
core   +1 more source

Modelling and observations of molecules in discs around young stars [PDF]

, 2013
This thesis contains a study of molecules within circumstellar discs around young stars. Firstly, the chemistry of a disc around a young, Class 0 protostar is modelled.
Ilee, John David
core  

Confined Chemistry in Space: Zeolite‐Supported Fe13 Nanoclusters Modulate CS Reactivity

Small Structures, Volume 7, Issue 3, March 2026.
The study explores how an Fe13 cluster confined in chabazite reshapes the reaction of CS and H2 under astrochemical conditions. Confinement promotes C–S bond cleavage over hydrogenation, directing chemistry toward CH4 and H2S formation. Additional CS enables CS2 and C2 species. Microkinetic analysis identifies protoplanetary environments where zeolites
Gerard Pareras, Albert Rimola
wiley   +1 more source

Simulating the birth environment of circumstellar discs [PDF]

, 2021
Circumstellar discs are the reservoirs of gas and dust that surround young stars and have the potential to become planetary systems. Their evolution will determine the time and material available to form planets.
Concha Ramirez, F.A.
core   +1 more source

Rapid CO gas dispersal from NO Lup’s class III circumstellar disc [PDF]

, 2020
We observed the K7 class III star NO Lup in an ALMA survey of the 1-3 Myr Lupus association and detected circumstellar dust and CO gas. Here we show that the J = 3-2 CO emission is both spectrally and spatially resolved, with a broad velocity width ∼19 ...
Kennedy, GM, Wyatt, M. C., Marino, S., Tazzari, M, Ansdell, M., Testi, L, Tazzari, M., Testi, L., Lovell, J.B., Rosotti, G., Ansdell, M, Lovell, JB, Matra, L, Manara, CF, Manara, C. F., Kennedy, Grant M., Kama, M., Lovell, J. B., Williams, JP, Marino, S, Kama, M, Wyatt, M.C., Kennedy, G.M., Manara, C.F., Rosotti, G, Williams, J. P., Williams, J.P., Matrá, L., Wyatt, MC   +28 more
core   +4 more sources

Seven white dwarfs with circumstellar gas discs II: tracing the composition of exoplanetary building blocks [PDF]

This second paper presents an in-depth analysis of the composition of the planetary material that has been accreted on to seven white dwarfs with circumstellar dust and gas emission discs with abundances reported in Rogers et al.
Klein, B. L., Walton, C., Xu, S., Weinberger, A., Bonsor, A., Kissler-Patig, M., Hodgkin, S., Buchan, A. M., Rogers, L. K., Dufour, P., Melis, C.   +10 more
core   +5 more sources

Diurnal Variability Modulates Episodic Convection in Hothouse Climates Over Ocean and Swamp‐Like Surface Conditions

Journal of Advances in Modeling Earth Systems, Volume 18, Issue 2, February 2026.
Abstract Hot and moist “hothouse” climates occurred in Earth's past and are expected in Earth's far future climate, driven by increasing solar luminosity. In hothouse climate regimes, precipitation transitions from a quasi‐steady state, as in present‐day tropical convection, to an “episodic deluge” or relaxation‐oscillator (RO) regime where ...
Namrah Habib, Guy Dagan, Nathan Steiger
wiley   +1 more source

Discovery of Volatile Gas in the Giant Impact Disk Around the 150 Myr Old HD 23514

The Astrophysical Journal Letters
We report the discovery of CO _2 gas emission around HD 23514, an F5V star in the ∼150 Myr old Pleiades cluster, hosting one of the rare giant-impact disks with unique mineralogy dominated by silica dust. We show that the dust feature remains stable over
Kate Y. L. Su, Attila Moór, Chengyan Xie, Ilaria Pascucci, George H. Rieke, Ágnes Kóspál, Mark C. Wyatt, Péter Ábrahám, Luca Matrà, Zoe Roumeliotis, D. J. Wilner   +10 more
doaj   +1 more source

Exploring the Effects of Reduced Gravitational Field Impacts on Convective Heat Transfer: A Comprehensive Review

Heat Transfer, Volume 55, Issue 1, Page 764-774, January 2026.
ABSTRACT This review explores the impact of gravitational instability on convective heat transfer, integrating existing research results and theoretical models. Gravitational instability is vital in promoting or hindering convective actions in different systems, such as atmospheric events, ocean currents, and industrial processes.
Hossam A. Nabwey, Muhammad Ashraf, A. M. Rashad, Ali J. Chamkha   +3 more
wiley   +1 more source